Dr Clare Materia Medica
Introduction to the Dispensing of Dr Clare’s Blended Herbs
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GentianGentian
Also Known As: Bitter Root, Bitterwort, Gall Weed, Geneciana, Gentianae Radix, Gentiane, Gentiane Acaule, Gentiane Jaune, Gentiane Pâle, Gentiane Sans Tige, Gentiane Sauvage, Grande Gentiane, Pale Gentian, Racine Amère, Stemless Gentian, Yellow Gentian, Wild Gentian. CAUTION: See separate listings for Canadian Hemp and Jimson Weed.
Scientific Name: Gentiana lutea; Gentiana acaulis, synonym Gentiana kochiana. Family: Gentianaceae.
People Use This For: Orally, gentian is used for digestive disorders, such as loss of appetite, fullness, flatulence, diarrhea, gastritis, heartburn, and vomiting. It is used orally for fever; hysteria; hypertension; and stimulating menstrual flow; and as an antispasmodic, anthelmintic, and antiseptic. Topically, gentian is used for treating wounds and cancer.In combination with European elder flower, verbena, cowslip flower, and sorrel, gentian is used orally for maintaining healthy sinuses and treating sinusitis. It is used in combination with other products for malaria. In foods and beverages, gentian is used as an ingredient. In manufacturing, gentian is used in cosmetics.
Safety: LIKELY SAFE ...when the root preparations are used in amounts commonly found in foods. Gentian root has Generally Recognized As Safe status (GRAS) for use in foods in the US (3). POSSIBLY SAFE ...when gentian root is used orally in a specific combination that contains gentian root, elderflower, verbena, cowslip flower, and sorrel (SinuComp, Sinupret) (1, 2). There is insufficient reliable information available about the safety of the topical use of gentian. PREGNANCY AND LACTATION: There is insufficient reliable information available about the safety of gentian in medicinal amounts during pregnancy and lactation; avoid using.
Effectiveness: POSSIBLY EFFECTIVE Sinusitis. Taking gentian orally in a specific combination product that also contains elderflower, verbena, cowslip flower, and sorrel (SinuComp, Sinupret) seems to help treat acute or chronic sinusitis Clinical studies have used Sinupret (1, 2). There is insufficient reliable information available about the effectiveness of gentian for its other uses.
Mechanism of Action: The applicable parts of gentian are the root and bark. The root is most commonly used. Gentian root contains triterpenoids, xanthones, and other constituents (5, 6). Preliminary research suggests gentian root has sedative effects. The xanthone gentiacaulein seems to have antidepressant activity, possibly through inhibition of monoamine oxidase (MAO)-A (6). Preliminary research suggests that gentian bark extracts might have MAO-B inhibitor effects (7). Gentian root has been used historically as an antihypertensive. Gentian root extracts seem to have vasorelaxant properties (8, 10). Preliminary research suggests that the xanthone constituents gentiacaulein and gentiakochianin may be responsible for vasodilation by an unknown mechanism (9).
Adverse Reactions: Orally, gentian root in combination with other herbs can cause gastrointestinal adverse effects and allergic skin reactions (1, 2).
Interactions with Herbs & Supplements: HERBS AND SUPPLEMENTS WITH HYPOTENSIVE EFFECTS: Gentian is thought to have hypotensive effects. Theoretically, combining gentian with other herbs and supplements with hypotensive effects might increase the risk of hypotension. Some of these herbs and supplements include andrographis, casein peptides, cat's claw, coenzyme Q-10, fish oil, L-arginine, lycium, stinging nettle, theanine, and others.
Interactions with Drugs: ANTIHYPERTENSIVE DRUGS <<interacts with>> GENTIAN Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate • Occurrence = Possible • Level of Evidence = D Theoretically, concurrent use might increase risk of hypotension with drugs that lower blood pressure (8, 10). These include captopril (Capoten), enalapril (Vasotec), losartan (Cozaar), valsartan (Diovan), diltiazem (Cardizem), Amlodipine (Norvasc), hydrochlorothiazide (HydroDiuril), furosemide (Lasix), and many others.
Interactions with Foods: None known.
Interactions with Lab Tests: None known.
Interactions with Diseases or Conditions: HYPOTENSION: Theoretically, gentian use might worsen hypotension or interfere with drug therapy to increase blood pressure (8, 10). SURGERY: Gentian might affect blood pressure. Theoretically, gentian might interfere with blood pressure control during and after surgical procedures. Tell patients to discontinue gentian at least 2 weeks before elective surgical procedures.
Dosage/Administration: chronic ORAL: For acute or sinusitis, a specific combination product (SinuComp Phytopharmica) containing gentian root 12 mg and 36 mgeach of European elder flower, verbena, sorrel, and cowslip flower has been used three times daily (1, 2). TOPICAL: No typical dosage.
Editor's Comments: The highly toxic white hellebore (Veratrum album) can be misidentified as gentian and has caused accidental poisoning when used in home-made preparations (4). Gentian root is unrelated to the gentian violet dye (methylrosaniline chloride).
Specific References: Ginseng 1. Neubauer N, Marz RW. Placebo-controlled, randomized,double-blind, clincal trial with Sinupret sugar coated tablets on the basis of a therapy with antibiotics and decongestant nasal drops in acute sinusitis. 1994;1:177-81. 2. Marz RW, Ismail C, Popp MA. Action profile and efficacy of a herbal combination preparation for the treatment of sinusitis. Wien Med Wochenschr 1999;149:202-8. 3. Electronic Code of Federal Regulations. Title 21. Part 182 -- Substances Generally Recognized As Safe. Available at: http://ecfr.gpoaccess.gov/cgi/t/text/textidx?c=ecfr&sid= 786bafc6f6343634fbf79fcdca7061e1&rgn=div5&view= text&node=21:3.0.1.1.13&idno=21 4. Zagler B, Zelger A, Salvatore C, et al. Dietary poisoning with Veratrum album--a report of two cases. Wien Klin Wochenschr 2005;117:106-8. 5. Toriumi Y, Kakuda R, Kikuchi M, et al. New triterpenoids from Gentiana lutea. Chem Pharm Bull (Tokyo) 2003;51:89-91. 6. Tomic M, Tovilovic G, Butorovic B, et al. Neuropharmacological evaluation of diethylether extract and xanthones of Gentiana kochiana. Pharmacol Biochem Behav 2005;81:535-42. 7. Haraguchi H, Tanaka Y, Kabbash A, et al. Monoamine oxidase inhibitors from Gentiana lutea. Phytochemistry 2004;65:2255-60. 8. Uncini Manganelli RE, Chericoni S, Baragatti B. Ethnopharmacobotany in Tuscany: plants used as antihypertensives. Fitoterapia 2000;71:S95-100. 9. Chericoni S, Testai L, Calderone V, et al. The xanthones gentiacaulein and gentiakochianin are responsible for the vasodilator action of the roots of 144 Gentiana kochiana. Planta Med 2003;69:770-2. 10. Baragatti B, Calderone V, Testai L, et al. Vasodilator activity of crude methanolic extract of Gentiana kokiana Perr. et Song. (Gentianaceae). J Ethnopharmacol 2002;79:369-72. (Gentianaceae). J Ethnopharmacol 2002;79:369-72. | |
Ginger
Also known as: African Ginger, Black Ginger, Gan Jiang. Scientific name: Zingiber officinale. Botanical Family: Zingiberaceae. Part used: The parts of ginger used medicinally are the rhizome (root-like stem) and root. Traditional use. Ginger is used for: motion sickness, morning sickness, colic, dyspepsia, flatulence, chemotherapy-induced nausea, rheumatoid arthritis, osteoarthritis, loss of appetite, nausea and vomiting following surgery, and migraine headaches. It is also used for upper respiratory tract infections, coughs, bronchitis, for the promotion of sweating, as a circulatory stimulant and for treating stomach-ache, diarrhea and nausea for any reason. Ginger is commonly used as a flavoring agent in foods and beverages.
Safety. There are no concerns regarding safety when used appropriately. Ginger has been safely used in several clinical trials.(1,2,3,4,5,6,7,8,9,10,11,12,13)
Pregnancy: There are no concerns regarding safety. Studies in pregnant women suggest that ginger can be used safely and effectively for morning sickness without harm to the fetus. As with any medication given during pregnancy, the potential benefit to risk must be weighed. See dose guidelines for use in pregnancy.
Breastfeeding: There are no problems with food levels of ginger in the diet. No scientific studies have been undertaken on therapeutic doses. All herbs and spices cross into breastmilk so only use therapeutic doses of ginger if there is a clinical indication that warrants therapy, weighing up relative risks and benefits of using the herb. Constituents Volatile oil; predominantly hydrocarbons including zingiberene, ar-curcumene and bisabolene. Pungent principles; a mixture of phenolic compounds with carbon side chains. These are referred to as gingerols, gingerdiols, gingerdiones, dihydrogingerdiones and shaogaols. The shaogoals are formed during the drying process and are twice as pungent as the gingerols. Hence the dried ginger is more pungent than the fresh herb. Constituents. Oleoresin; including gingerol homologues including derivatives with a methyl sidechain. Gingerglycolipids 6-gingesulphonic acid. Starch, proteins (amino acids including arginine) and fat. Vitamins; including niacin, and vitamin A. Minerals. Scientific evidence. Morning sickness. Taking ginger orally seems to reduce the severity of nausea and vomiting with morning sickness. Ginger seems to be more effective than placebo and comparable to vitamin B6. (1,4,10,14,15,16) Vertigo. Taking 1 gram of ginger orally seems to reduce symptoms of vertigo, including nausea.(9) Osteoarthritis. Severalstudies have shown evidence of symptom relief as effective as ibuprofen and diclofenac (NSAIDs). One study showed benefit after twelve weeks of treatment. (5,6,7,23,24,25) Muscle Soreness. One study showed reduction in muscle soreness in women. (26) Painful periods. Two recent clinical trials in women demonstrated that ginger for 3 days from the start of their menstrual period was as effective as mefenamic acid (Ponstan) and ibuprofen (Nurafen) and placebo in relieving period pain. (27,28) Migraine headache. Anecdotal evidence suggests that ginger might reduce the severity and duration of migraine headache.(9)
Mechanism of action. Active constituents of ginger include gingerol, gingerdione, shogaol, and sesquiterpene and monoterpene volatile oils.(17,18) The chemical constituents of ginger vary among fresh, semi-dry, and dry forms of ginger.(17) Ginger has a variety of pharmacological properties including; lowering fever, analgesia, cough inhibition, anti-inflammatory, sedative, antibiotic, weak antifungal, and other properties.(19,17)
The mechanism by which ginger reduces nausea and vomiting might be due to the 6-gingerol constituent.(20) Other ginger constituents such as 6-shogaol and galanolactone seem to act on serotonin (a chemical transmitter in the nervous system, especially in the brain and gut) receptors.(20) Galanolactone seems to act primarily on serotonin receptors in the small intestine. Ginger has been shown to possess free radical scavenging, antioxidant, inhibition of lipid peroxidation and that these properties might have contributed to the observed gastro-protective effects. Ginger is sometimes used for inflammatory conditions such as osteoarthritis and rheumatoid arthritis. Some researchers speculate that certain constituents of ginger might inhibit pro-inflammatory enzymes.(21) Compounds found in ginger are capable of inhibiting PGE-2 production and that the compounds may act at several sites.(29)
Adverse reactions. Ginger is usually well tolerated when used in usual doses.
Interactions with herbs and supplements. None reported.
Interactions with drugs. None reported. Interaction with warfarin is generally cautioned. However a study showed that in healthy subjects there was no alteration in the metabolism of warfarin.(30,31) Undertake weekly monitoring for one month as an additional precaution.
Interactions with foods. None known.
Interactions with laboratory tests. None known.
Dosage. Recommended dose: 1.5-6mls per day 1:5 tincture 70% alcohol. Or for a stronger 1:2 tincture 90% alcohol the dose is from 0.25-0.5ml per day. Decoction: range from tsps. per day. Powder/capsule: range from 0.75-3gms per day. Osteoarthritis Oral: For morning sickness, 250 mg ginger 4 times daily, or 500 mg twice daily, has been used. (1,4,12,18) A higher dose of 650 mg 3 times daily has also been used.(16) It may take 3-4 days of regular use to be effective. For motion sickness, 1 gram of dried powdered ginger root 30 minutes to 4 hours before travel has been used.(8,22)
References. 1. Fischer-Rasmussen W, Kjaer SK, Dahl C, Asping U. Ginger treatment of hyperemesis gravidarum. Eur J Obstet Gynecol Reprod Biol 1991;38:19-24. 2. Phillips S, Ruggier R, Hutchinson SE. Zingiber officinale (ginger)-an antiemetic for day case surgery. Anaesthesia 1993;48:715-7. 3. Bone ME, Wilkinson DJ, Young JR, et al. Ginger root-a new antiemetic. The effect of ginger root on postoperative nausea and vomiting after major gynaecological surgery. Anaesthesia 1990;45:669-71. 4. Vutyavanich T, Kraisarin T, Ruangsri R. Ginger for nausea and vomiting in pregnancy: randomized, double-masked, placebo-controlled trial. Obstet Gynecol 2001;97:577-82. 5. Bliddal H, Rosetzsky A, Schlichting P, et al. A randomized, placebo-controlled, cross-over study of ginger extracts and ibuprofen in osteoarthritis. Osteoarthritis Cartilage 2000;8:9-12. 6. Altman RD, Marcussen KC. Effects of ginger extract on knee pain in patients with osteoarthritis. Arthritis Rheum 2001;44:2531-38. 7. Marcus DM, Suarez-Almazor ME. Is there a role for ginger in the treatment of osteoarthritis? Arthritis Rheum 2001;44:2461-2. 8. Grontved A, Brask T, Kambskard J, Hentzer E. Ginger root against seasickness: a controlled trial on the open sea. Acta Otolaryngol 1998;105:45-9. 9. Grontved A, Hentzer E. Vertigo-reducing effect of ginger root. A controlled clinical study. ORL J Otorhinolaryngol Relat Spec 1986;48:282-6. 10. Portnoi G, Chng LA, Karimi-Tabesh L, et al. Prospective comparative study of the safety and effectiveness of ginger for the treatment of nausea and vomiting in pregnancy. Am J Obstet Gynecol 2003;189:19-7. 11. Wigler I, Grotto I, Caspi D, Yaron M. The effects of Zintona EC (a ginger extract) on symptomatic gonarthritis. Osteoarthritis Cartilage 2003;11:783-9. 12. Smith C, Crowther C, Wilson K et al. A randomized controlled trial of ginger to treat nausea and vomiting in pregnancy. Obstet Gynecol 2004;103:639-45. 13. Manusirivithaya S, Sripramote M, Tangjitgamol S, et al. Antiemetic effect of ginger in gynecologic oncology patients receiving cisplatin. Int J Gynecol Cancer 2004;14:1063-9. 14. Jewell D, Young G. Interventions for nausea and vomiting in early pregnancy. Cochrane Database Syst Rev 2000;(2):CD000145. 15. Borrelli F, Capasso R, Aviello G, et al. Effectiveness and safety of ginger in the treatment of pregnancy-induced nausea and vomiting. Obstet Gynecol 2005;105:849-56. 16. Chittumma P, Kaewkiattikun K, Wiriyasiriwach B. Comparison of the effectiveness of ginger and vitamin B6 for treatment of nausea and vomiting in early pregnancy: a randomized double-blind controlled trial. J Med Assoc Thai 2007;90:15-20. 17. Suekawa M, Ishige A, Yuasa K, et al. Pharmacological studies on ginger. I. Pharmacological actions of pungent constitutents, (6)-gingerol and (6)-shogaol. J Pharmacobiodyn 1984;7:836-48. 18. Pongrojpaw D, Somprasit C, Chanthasenanont A. A randomized comparison of ginger and dimenhydrinate in the treatment of nausea and vomiting in pregnancy. J Med Assoc Thai 2007;90:1703-9. 19. Langner E, Greifenberg S, Gruenwald J. Ginger: history and use. Adv Ther 1998;15:25-44. 20. Lumb AB. Mechanism of antiemetic effect of ginger. Anaesthesia 1993;48:1118. 21. Thomson M, Al-Qattan KK, Al-Sawan SM, et al. The use of ginger (Zingiber officinale Rosc.) as a potential anti-inflammatory and antithrombotic agent. Prostaglandins Leukot Essent Fatty Acids 2002;67:475-8. 22. Ernst E, Pittler MH. Efficacy of ginger for nausea and vomiting: a systematic review of randomized clinical trials. Br J Anaesth 2000;84:367-71. 23. Wigler I, Grotto I, Caspi D, Yaron M. The effects of Zintona EC (a ginger extract) on symptomatic gonarthritis. Osteoarthritis Cartilage 2003;11:783-9
24. Haghighi M, Khalva A, Toliat T, Jallaei S. Comparing the effects of ginger (Zingiber officinale) extract and ibuprofen on patients with osteoarthritis. Arch Iran Med 2005;8:267-71.
25. Drozdov VN, Kim VA, Tkachenko EV, Varvanina GG. Influence of a specific ginger combination on gastropathy conditions in patients with osteoarthritis of the knee or hip. J Alt Compl Med 2012;18:583-8. 26. Int J Prev Med. 2013 Apr;4(Suppl 1):S11-5. Influence of ginger and cinnamon intake on inflammation and muscle soreness endued by exercise in Iranian female athletes. Mashhadi NS1, Ghiasvand R, Askari G, Feizi A, Hariri M, Darvishi L, Barani A, Taghiyar M, Shiranian A, Hajishafiee M. 27. Giti Ozgoli, Marjan Goli, and Fariborz Moattar. The Journal of Alternative and Complementary Medicine. February 2009, 15(2): 129-132. doi:10.1089/acm.2008.0311. Published in Volume: 15 Issue 2: February 23, 2009 28. Effect of Zingiber officinale R. rhizomes (ginger) on pain relief in primary dysmenorrhea: a placebo randomized trial Parvin Rahnama, Ali Montazeri, Hassan Fallah Huseini, Saeed Kianbakht and Mohsen Naseri. BMC Complementary and Alternative Medicine 2012, 12:92 29. Phytomedicine. 2007 Feb;14(2-3):123-8. Epub 2006 May 18. The effect of extracts from ginger rhizome on inflammatory mediator production. Lantz RC1, Chen GJ, Sarihan M, Sólyom AM, Jolad SD, Timmermann BN. 30. Effect of ginkgo and ginger on the pharmacokinetics and pharmacodynamics of warfarin in healthy subjects Xuemin Jiang1, Kenneth M. Williams2, Winston S. Liauw2, Alaina J. Ammit1, Basil D. Roufogalis1, Colin C. Duke1, Richard O. Day2 andAndrew J. McLachlan. British Journal of Clinical Pharmacology Volume 59, Issue 4, pages 425–432, April 2005 31. Badreldin H. Ali,Gerald Blunden, Musbah O. Tanira, Abderrahim Nemmar. Some phytochemical, pharmacological and toxicological properties of ginger (Zingiber officinale Roscoe): A review of recent research. Food and Chemical Toxicology Vol. 46, Issue 2. February 2008, Pages 409–420 | |
Gotu KolaGotu Kola
Also Known As: Brahma-Buti, Brahma-Manduki, Brahmi, Centella, Centella Asiática, Centella Asiatique, Centellase, Divya, Hydrocotyle, Hydrocotyle Asiatique, Hydrocotyle Indien, Indischer Wassernabel, Idrocotyle, Indian Pennywort, Indian Water Navelwort, Ji Xue Cao, Khulakhudi, Luei Gong Gen, Luo De Da, Madecassol, Mandukaparni, Manduk Parani, Mandukig, Marsh Penny, TTFCA, Talepetrako, Thick-Leaved Pennywort, Tsubo-kusa, Tungchian, White Rot. CAUTION: See separate listings for Brahmi and Cola Nut.
Scientific Name: Centella asiatica, synonym Hydrocotyle asiatica; Centella coriacea. Family: Apiaceae/Umbelliferae.
People Use This For: Orally, gotu kola is used for reducing fatigue, anxiety, depression, improving memory and intelligence, Alzheimer's disease, venous insufficiency including varicose veins, wound healing, and increasing longevity. It is also used for the common cold and influenza, swine flu, sunstroke, tonsillitis, pleurisy, urinary tract infection (UTI), hepatitis, jaundice, abdominal pain,diarrhoea, indigestion, gastritis, peptic ulcer disease, dysentery, trauma, shingles,leprosy, cholera, syphilis, psychiatric disorders, epilepsy, asthma, anaemia, and diabetes. Gotu kola is also used for contraception, amenorrhea, elephantiasis, systemic lupus erythematosus (SLE), tuberculosis, memory loss, and as an aphrodisiac. Topically, gotu kola is used for wound healing and reducing scars. Parenterally, gotu kola is used for bladder lesions associated with schistosomiasis.
Safety: POSSIBLY SAFE ...when used topically and appropriately. Gotu kola has been used safely in a cream and ointment for up to 8weeks (27, 28). ...when used orally. Gotu kola has been used safely in trials lasting up to 12 months (7, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26). However, there is concern that gotu kola might cause hepatotoxicity in some patients (29). PREGNANCY: POSSIBLY SAFE ...when used topically and appropriately (28, 31). There is insufficient reliable information available about the safety gotu kola when used orally during pregnancy; avoid using. LACTATION: Insufficient reliable information available; avoid using.
Effectiveness: POSSIBLY EFFECTIVE Venous insufficiency. Taking gotu kola orally for 4-8 weeks seems to improve measures of circulation and decrease symptoms such as edema (7, 11, 18, 19, 21, 25). INSUFFICIENT RELIABLE EVIDENCE to RATE Atherosclerosis. There is preliminary evidence that taking gotu kola orally for 12 months might help stabilize low-density atherosclerotic plaques. Stabilizing these plaques might reduce the risk of rupture and embolism (17,24). Deep vein thrombosis (DVT). Gotu kola helps prevent thrombosis related to long-distance flights.Preliminary evidence suggests that gotu kola might decrease edema, and improve measures of circulation in patients traveling on airplanes for more than 3 hours (22); however, it is not known if t his actually results in a decreased incidence of clots. Diabetic microangiopathy. Taking gotu kola orally for 6-12 months might help increase measures of circulation, and decrease edema in patients with diabetic microangiopathy (20, 23). Keloids. There is some evidence that applying an extract of gotu kola, known as madecassol, topically might help reduce keloids and hypertrophic scarring (30). Psoriasis. Some evidence suggests that applying gotu kola topically might help reduce symptoms of psoriasis (6). Scarring: Preliminary evidence suggests that applying a specific gotu kola cream (Alpha centella, not available in the US) twice daily for 6-8weeks following suture removal might help reduce scarring in patients without a history of keloid formation (27). Schistosomiasis. There is some evidence that using gotu kola parenterally might help bladder lesions of schistosomiasis (bilharzial infections) (10). Stretch marks (striae gravidarum). Preliminary evidence suggests that applying a specific mixture of gotu kola, vitamin E, and collagen-elastin hydrolysates in a cream (Trofolastin, not available in the US) daily during the second and third trimesters of pregnancy until labor might reduce stretch marks (31). There is also preliminary evidence that another specific mixture of gotu kola, vitamin E, essential fatty acids, hyaluronic acid, elastin, and menthol in an ointment (Verum, not available in the US) might help decrease the formation of stretch marks during pregnancy (28). Wound healing. Preliminary evidence suggests that applying gotu kola topically might help improve wound healing (7). More evidence is needed to rate gotu kola for these uses.
Mechanism of Action: The applicable parts of gotu kola are the above groundparts. The primary constituents responsible for the pharmacological effects are thought to be the saponin-containing triterpene acids, 1% to 8%; and their sugar esters, including asiatic acid, madecassic acid, asiaticoside A (madecassoside), and asiaticoside B (26). Gotu kola also contains essential oils; flavonoids; and flavone derivatives including quercetin and kaempferol, sesquiterpenes, stigmasterol, sitosterol, and isothankuniside (713). In vitro evidence suggests that gotu kola might bind cholecystokinin (CCK) and GABA receptors, which might be responsible for reported anxiolytic effects of gotu kola (6, 26). The effects on GABA might also results in sedative, anticonvulsant, and analgesic effects (7). There is some evidence that taking gotu kola orally might to reduce the startle response in healthy volunteers (26). Some researchers think the asiaticoside derivatives, asiatic acid, asiaticoside 6, and SM2, might have a role in Alzheimer's disease. Preliminary evidence that they might protect neurons from beta-amyloid toxicity (3). The triterpenoid saponins (e.g., asiaticoside, madecassoside) seem to increase wound healing and decrease venous pressure in venous insufficiency (2. 5, 11). Asiaticoside and other terpenoids might have anti-inflammatory activity (27, 32). The terpenoid extract seems to improve connective tissue re modeling by increasing fibroblast activity, stimulating collagen synthesis, increasing epithelial turnover over, and decreasing capillary permeability (16,17,19). Gotu kola is thought to increase the production of type I collagen in scar formation over type II. Type II collagen is associated with hypertrophic scarring (27). The terpenoid extract might help stabilize arterial plaques by increasing collagen within plaques. Plaques with low collagen content are structurally weak and are associated with an increased risk of rupture and embolism (17, 24)). There is also some evidence that asiaticosides might promote wound healing by stimulating collagen and glycosaminoglycan synthesis (4, 5). There's preliminary evidence that asiaticosides might also have preventive and therapeutic effects on gastrointestinal ulcers (7, 8). Anti-ulcer mechanisms may be due to strengthening action on gastric mucosal lining and suppression of damaging effects of free radicals (8). Preliminary evidence suggests that purified isothankuniside might decrease fertility. However, a crude extract of gotu kola does not reduce fertility (13). Gotu kola extracts also seem to have antibacterial activity in vitro against Pseudomonas pyocyaneus, Trichoderma mentagrophytes, and Entamoeba histolytica. It also seems to have antiviral activity againstHerpes simplex type II (7). There is some interest in using gotu kola to treat cancer. Dried powder extracts of gotu kola exhibit cytotoxic and anti-tumor properties in preliminary studies. Normal lymphocytes are not harmed, which suggests gotu kola exerts selective toxicity towards tumor cells (9). There are some case reports of hepatotoxicity. The triterpenoids contained in gotu kola are theorized to be responsible for this adverseeffect (29).
Adverse Reactions: Orally, gotu kola is usually well-tolerated when used in typical doses (17, 18, 19, 20, 22, 23, 24, 25, 26). However, in some patients it can cause gastrointestinal upset and nausea (7). Theoretically, gotu kola might also cause drowsiness (7). There are at least three cases of hepatotoxicity associated with gotu kola. In one case, a 61-year-old woman developed elevated liver function tests (LFTs) including AST, ALT, alkaline phosphatase, and total bilirubin after taking gotu kola tablets for 30 days. Liver biopsy showed granulomatous acute hepatitis, suggesting an immune mediated hepatitis. LFTs improved when gotu kola was discontinued. Months later the patient took gotu kola again and developed elevated LFTs again after 2 weeks. In another case, a 52-year-old woman developed symptoms of hepatitis and increased LFTs after taking gotu kola for 3 weeks. Biopsy indicated chronic hepatitis and granulomas,areas of necrosis, and cirrhotic transformation. LFTs normalized after discontinuation of gotu kola. In a third case, a 49-year-old woman developed symptoms of hepatitis and elevated LFTs 2 months after starting gotu kola. Biopsy revealed granulomatous hepatitis. LFTs normalized after discontinuation of gotu kola (27). Researchers did not perform laboratory analysis of the products taken in these cases to determine if they were free of hepatotoxic contaminants. Therefore, it is not possible to rule out product contamination. The doses of gotu kola taken by these patients is unknown. Therefore, it is not known if higher doses are more likely than lower doses to cause hepatotoxicity. In a clinical trial where liver function was monitored, patients taking gotu kola 120 mg/day for 6 months, no changes in hepatic function were observed (20).
Topically, gotu kola can cause allergic contact dermatitis, characterized by erythema, itching, papules, and a burning sensation (1,7, 12). Gotu kola may also cause eczema when applied topically (14, 15).
Interactions with Herbs & Supplements: HEPATOTOXIC HERBS AND SUPPLEMENTS: There is some concern that gotu kola might cause hepatotoxicity in some patients (29). Theoretically, concomitant use with other potentially hepatotoxic products might increase the risk of developing liver damage. Some of these products include androstenedione, chaparral, comfrey, DHEA, germander, niacin, pennyroyaloil, red yeast, and others. HERBS AND SUPPLEMENTS WITH SEDATIVE PROPERTIES: Theoretically, concomitant use with herbs that have sedative properties might enhance therapeutic and adverse effects (7). Some of these supplements include 5-HTP, calamus, California poppy, catnip, hops, Jamaican dogwood, kava, St. John's wort, skullcap, valerian, yerba mansa, and others.
Interactions with Drugs: Topically, gotu kola can cause allergic contact dermatitis, characterized by erythema, itching, papules, and a burning sensation (1,7, 12). Gotu kola may also cause eczema when applied topically (14, 15).
Interactions with Herbs & Supplements: HEPATOTOXIC HERBS AND SUPPLEMENTS: There is some concern that gotu kola might cause hepatotoxicity in some patients (29). Theoretically, concomitant use with other potentially hepatotoxic products might increase the risk of developing liver damage. Some of these products include androstenedione, chaparral, comfrey, DHEA, germander, niacin, pennyroyal oil, red yeast, and others. HERBS AND SUPPLEMENTS WITH SEDATIVE PROPERTIES: Theoretically, concomitant use with herbs that have sedative properties might enhance therapeutic and adverse effects (7). Some of these supplements include 5-HTP, calamus, California poppy, catnip, hops, Jamaican dogwood,kava, St. John's wort, skullcap, valerian, yerba mansa, and others.
Interactions with Drugs: CNS DEPRESSANTS <<interacts with>> GOTU KOLA Interaction Rating = Major Do not take this combination. Severity = High • Occurrence = Probable • Level of Evidence = D Theoretically, concomitant use of gotu kola with drugs with sedative properties might cause additive effects and side effects (7). Some sedative drugs include clonazepam (Klonopin), lorazepam (Ativan), phenobarbital (Donnatal), zolpidem (Ambien), and others. HEPATOTOXIC DRUGS <<interacts with>> GOTU KOLA Interaction Rating = Moderate Be cautious with this combination. Severity = High • Occurrence = Possible • Level of Evidence = D There is some concern that gotu kola might cause hepatotoxicity in some patients (29). Theoretically, concomitant use with other potentially hepatotoxic drugs might increase the risk of developing liver damage. Some of these drugs include acarbose (Precose, Prandase), amiodarone (Cordarone), atorvastatin (Lipitor), azathioprine (Imuran), carbamazepine (Tegretol), cerivastatin (Baycol), diclofenac (Voltaren), felbamate (Felbatol), fenofibrate (Tricor), fluvastatin (Lescol), gemfibrozil (Lopid), isoniazid, itraconazole, (Sporanox), ketoconazole (Nizoral), leflunomide (Arava), lovastatin (Mevacor), methotrexate (Rheumatrex), nevirapine (Viramune), niacin, nitrofurantoin (Macrodantin), pioglitazone (Actos), pravastatin (Pravachol), pyrazinamide, rifampin (Rifadin), ritonavir (Norvir), rosiglitazone (Avandia), simvastatin (Zocor), tacrine (Cognex), tamoxifen, terbinafine (Lamisil), valproic acid, and zileuton (Zyflo).
Interactions with Foods: None known. Interactions with Lab Tests: None known.
Interactions with Diseases or Conditions: LIVER DISEASE: There is concern that gotu kola might be linked to cases of hepatotoxicity (29). Theoretically, gotu kola might exacerbate liver problems in patients with existing liver disease such as hepatitis. Advise these patients to avoid taking gotu kola. SURGERY: Gotu kola has CNS depressant effects. Theoretically, gotu kola might cause additive CNS depression when combined with anesthesia and other medications during and after surgical procedures. Tell patients to discontinue gotu kola at least 2 weeks before elective surgical procedures. Dosage/Administration: ORAL: For atherosclerosis, 60 mg of gotu kola extract three times daily has been used (17, 24). For diabetic microangiopathy, 60 mg of gotu kola extract twice daily has been used (20, 23). For venous insufficiency, 60-180 mg daily of gotu kola extract has been used (18, 19, 21, 25). For deep vein thrombosis (DVT) prevention while flying, 120 mg of gotu kola extract 3 days before the flight, the day of the flight, and the day after have been used (22). TOPICAL: For wound healing, 1% gotu kola creams have been used (7). For scars, gotu kola has been used in combination with the extract from Bulbine frutescens (Alpha centella cream, not available in the US) for 6-8weeks (27). For preventing stretch marks in pregnancy, gotu kola has been used in combination with several other ingredients (Trofolastin and Verum). Trofolastin cream (not available in the US) is a mixture of gotu kola, vitamin E, and collagen-elastin hydrolysates (21). Verum ointment (not availablein the US) contains gotu kola, vitamin E, essential fatty acids, hyaluronic acid, elastin, and menthol (28).
Editor's Comments: Gotu kola is a commonly used herb in Tradition Chinese and Ayurvedic medicine (26). The terpenoid extract of gotu kola is sometimes referredto as TTFCA (total terpenoid fraction of Centella asiatica) and Centellase. Avoid confusion with cola nut (Cola acuminata), and swamp pennywort (Centella cordifolia). Centella cordifolia is often misidentified as Centella asiatica (gotu kola).
Specific References: 1. Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996. 2. Pointel JP, Boccalon H, Cloarec M, et al. Titrated extract of Centella asiatica (TECA) in the treatment of venous insufficiency of the lower limbs. Angiol 161 1987;38:46-50. 3. Mook-Jung I, Shin JE, Yun SH, et al. Protective effects of asiaticoside derivatives against beta-amyloid neurotoxicity. J Neurosci Res 1999;58:417-25. 4. Maquart FX, Chastang F, Simeon A, et al. Triterpenes from Centella asiatica stimulate extracellular matrix accumulation in rat experimental wounds. Eur J Dermatol 1999;9:289-96. 5. Shukla A, Rasik AM, Jain GK, et al. In vitro and in vivo wound healing activity of asiaticoside isolated from Centella asiatica. J Ethnopharmacol 1999;65:1-11. 6. Kenady DE, Chretien PB, Potvin C, Simon RM. Thymosin reconstitution of T-cell deficits in vitro in cancer patients. Cancer 1977;39:575-80. 7. Brinkhaus B, Lindner M, Schuppan D, Hahn EG. Chemical, pharmacological and clinical profile of the east Asian medical plant Centella asiatica. Phytomedicine 2000;7:427-48. 8. Cheng CL, Koo MWL. Effects of Centella asiatica on ethanol induced gastric mucosal lesions in rats. Life Sci 2000;67:2647-53. 9. Babu TD, Kuttan G, Padikkala J. Cytotoxic and anti-tumour properties of certain taxa of Umbelliferae with special reference toCentella asiatica (L.) Urban. J Ethnopharmacol 1995;48:53-7. 10. Fam A. Use of titrated extract of Centella asiatica (TECA) in bilharzial bladder lesions. Int Surg 1973;58:451-2. 11. Belcaro GV, Rulo A, Grimaldi R. Capillary filtration and ankle edema in patients with venous hypertension treated with TTFCA. Angiology 1990;41:12-8. 12. Eun HC, Lee AY. Contact dermatitis due to madecassol. Contact Dermatitis 1985;13:310-3. 13. Dutta T, Basu UP. Crude extract of Centella asiatica and products derived from its glycosides as oral antifertility agents. Indian J Exp Biol 1968;6:181-2. 14. Hausen BM. Centella asiatica (Indian pennywort), an effective therapeutic but a weak sensitizer. Contact Dermatitis 1993;29:175-9. 15. Bilbao I, Aguirre A, Zabala R, et al. Allergic contact dermatitis from butoxyethyl nicotinic acid and Centella asiatica extract.Contact Dermatitis 1995;33:435-6. 16. Incandela L, Cesarone MR, Cacchio M, et al. Total triterpenic fraction of Centella asiatica in chronic venous insufficiency and in high-perfusion microangiopathy. Angiology 2001;52 Suppl 2:S913. 17. Incandela L, Belcaro G, Nicolaides AN, et al. Modification of the echogenicity of femoral plaques after treatment with total triterpenic fraction of Centella asiatica: a prospective, randomized, placebo-controlled trial. Angiology 2001;52 Suppl 2:S69-73. 18. Incandela L, Belcaro G, De Sanctis MT, et al. Total triterpenic fraction of Centella asiatica in the treatment of venous hypertension: a clinical, prospective, randomized trial using a combined microcirculatory model. Angiology 2001;52 Suppl 2:S61-7. 19. De Sanctis MT, Belcaro G, Incandela L, et al. Treatment of edema and increased capillary filtration in venous hypertension with total triterpenic fraction of Centella asiatica: a clinical, prospective, placebo-controlled, randomized, dose-ranging trial. Angiology 2001;52 Suppl 2:S55-9 20. Cesarone MR, Incandela L, De Sanctis MT, et al. Evaluation of treatment of diabetic microangiopathy with total triterpenic fraction of Centella asiatica: a clinical prospective randomized trial with a microcirculatory model. Angiology 2001;52 Suppl 2:S49-54. 21. Cesarone MR, Belcaro G, Rulo A, et al. Microcirculatory effects of total triterpenic fraction of Centella asiatica in chronic venous hypertension: measurement by laser Doppler, TcPO2-CO2, and leg volumetry. Angiology 163 2001;52 Suppl 2:S45-8. 22. Cesarone MR, Incandela L, De Sanctis MT, et al. Flight microangiopathy in medium- to long distance flights: prevention of edema and microcirculation alterations with total triterpenic fraction of Centella asiatica. Angiology 2001;52 Suppl 2:S33-7. 23. Incandela L, Belcaro G, Cesarone MR, et al. Treatment of diabetic microangiopathy and edema with total triterpenic fraction of Centella asiatica: a prospective, placebo-controlled randomized study. Angiology 2001;52 Suppl 2:S27-31. 24. Cesarone MR, Belcaro G, Nicolaides AN, et al. Increase in echogenicity of echolucent carotid plaques after treatment with total triterpenic fraction of Centella asiatica: a prospective, placebo-controlled, randomized trial. Angiology 2001;52 Suppl 2:S19-25. 25. Cesarone MR, Belcaro G, De Sanctis MT, et al. Effects of the total triterpenic fraction of Centella asiatica in venous hypertensive microangiopathy: a prospective, placebo-controlled, randomized trial. Angiology 2001;52 Suppl 2:S15-18. 26. Bradwejn J, Zhou Y, Koszycki D, Shlik J. A double-blind, placebo-controlled study on the effects of Gotu Kola (Centella asiatica) on acoustic startle response in healthy subjects. J Clin Psychopharmacol 2000;20:680-4. 27. Widgerow AD, Chait LA, Stals R, Stals PJ. New innovations in scar management. Aesthetic Plast Surg 2000;24:227-34. 28. Young GL, Jewell D. Creams for preventing stretch marks in pregnancy. Cochrane Database Syst Rev 2000;(2):CD000066. 29. Jorge OA, Jorge AD. Hepatotoxicity associated with the ingestion of Centella asiatica. Rev Esp Enferm Dig 2005;97:115-24. 30. Bosse JP, Papillon J, Frenette G, et al. Clinical study of a new antikeloid agent. Ann Plast Surg 1979;3:13,21. 31. Mallol J, Belda MA, Costa D, et al. Prophylaxis of striae gravidarum with a topical formulation. A double blind trial. Int J Cosmet Sci 1991;3:51-7. 32. Guo JS, Cheng CL, Koo MW. Inhibitory effects of Centella asiatica water extract and asiaticoside on inducible nitric oxide synthase during gastric ulcer healing in rats. Planta Med 2004;70:1150-4.
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Green teaAlso known as: Green Sencha Tea, Japanese Tea. Scientific name: Camellia sinensis, it is from the exact same tea plant as Black tea commonly used throughout the world. Botanical family: Theaceae. Parts used: Bud leaf and stem.
Traditional use. Green tea has been consumed and enjoyed as a beverage for centuries. Green tea is produced by steaming fresh leaves at high temperature. Unlike black and oolong (partially fermented) teas, green tea is not fermented. Improving cognitive performance and mental alertness is a traditional use for green tea. It is also used to treat stomach disorders, vomiting, diarrhea, and headaches. Green tea has a history of use for weight loss. It has a role in cancer prevention and treatment including breast cancer, cervical cancer, prostate cancer, colon cancer, gastric cancer, lung cancer, leukemia, and skin cancer related to ultraviolet radiation (e.g. sunburn) and other environmental causes. It has traditionally been used for its anti-viral effects on the wart virus including genital warts, perianal warts and cervical cell changes. Other uses include osteoporosis, Crohn's disease, Parkinson's disease, cardiovascular disease, diabetes, low blood pressure, chronic fatigue syndrome, tooth decay, kidney stones, and skin damage.
Topically, green tea is used as a wash to soothe sunburn, as a poultice for bags under the eyes, as a compress for headache or tired eyes, and to stop the bleeding of tooth sockets. Green tea in chewable candy is used for inflammation of the gums. Green tea is also used topically to prevent skin damage and cancer related to ultraviolet radiation (e.g. sunburn) and other environmental causes.
Safety. There are no concerns about safety when consumed as a beverage in moderate amounts of 1-4 cups of green tea per day. (1,2,3,4,5,6,7,8) Green tea extract as a supplement containing 7% caffeine has been used safely for six months. (9) Avoid using high doses long-term because Green tea contains a significant amount of caffeine. Typically a cup of green tea contains 35-60mgs of caffeine. Children: While no safety concerns have been highlighted avoid caffeinated drinks in children and limit to 1 cup per day. (11,12) Avoid giving green tea to infants, as they have an increased risk of anemia. (88) Pregnancy: There are no reported problems when used orally in moderate amounts of two cups per day. Breastfeeding: There are no particular concerns when used orally in moderate amounts of 1-4 cups per day. If the baby has loose stools exclude green tea, black tea and coffee to see if caffeine is contributing to the problem. Constituents.
Scientific Evidence. Mental Alertness. Green tea and other caffeinated beverages prevent a decline in alertness and cognitive capacity when consumed throughout the day. (10,13,14)
Bladder cancer, esophageal cancer, and pancreatic cancer. cervical dysplasia. Drinking green tea is associated with a reduced the risk of bladder cancer, esophageal cancer, and pancreatic cancer. (15,16,17,18,19) Green tea as an oral or topical preparation seems to reduce cervical dysplasia caused by human warts (papilloma virus) infection. (20).
High Cholesterol. Green tea taken orally lowers cholesterol and triglycerides.(21)(22) Low Blood Pressure. Consuming caffeinated beverages including Green Tea increases blood pressure in elderly people with low blood pressure after meals which may prevent falls. (23,24) Oral leukoplakia (lesions of the mouth that may progress to cancer). Drinking green tea orally decreases the size of lesions in patients with oral leukoplakia. (25) Ovarian cancer; Women who regularly consume green tea or black tea, have a lower risk of developing ovarian cancer.(92,25,26,27) Parkinson's disease. Consuming green tea orally helps prevent or delay the onset of Parkinson's disease. (28, 29) Prevention of colorectal cancer. Population studies suggest that consuming green tea does not have any effect on colon cancer risk. (30,31,32)
Breast cancer. Population studies suggest that green tea does not seem to reduce the risk of initially developing breast cancer in Asian populations; (33.34) however, in Asian-American populations some evidence suggests that drinking green tea might reduce the risk of developing breast cancer. (35) Additional population research suggests that Asian women who have had early breast cancer (Stage 1-11) who drink 3-5 of more cups of green tea daily seem to have reduced risk of breast cancer recurrence. (36,33) Cardiovascular disease. A large-scale population study in Japan suggests that consuming 3 or more cups of green tea daily significantly decreases the risk of cardiovascular and all-cause mortality compared to drinking less than one cup daily. (32) Diabetes. Population studies suggests that Japanese adults who consume 6 or more cups/day of green tea have a 33% lower risk of developing type 2 diabetes.(37) Gastric Cancer. There is conflicting evidence about the effects of green tea on gastric cancer risk. Gingivitis (inflammation of the gums); Green tea extract in chewable candy appears to reduce inflammation. (38) High Blood Pressure. There is evidence of variable effects of green tea depending on the physiological state of the tissues when taken by individuals. Population studies in Chinese people show that drinking 120-599 mL of green tea or oolong tea daily is associated with a 46% lowered risk of developing hypertension compared with non-habitual tea drinkers. Drinking more than 600 mL per day is associated with a 65% reduced risk. (39) However, clinical studies on people with normal and high blood pressure show that green tea or black tea has no effect on their blood pressure. (40) This apparent contradiction is common with herbal medicines who only have an action when it is required to normalise the physiological terrain. It is one of the benefits of multi constituent medicines. Active constituents can vary from person to person depending on their individual physiology. Lung Cancer. There is conflicting evidence about the effects of green tea on lung cancer risk. (32) (41) Obesity. There is conflicting evidence about the effectiveness of green tea for obesity and weight loss. A meta-analysis of clinical studies suggests that, overall, taking green tea extract 576-714 mg/day along with caffeine seems to modestly reduce body mass index (BMI), body weight, and waist circumference compared to caffeine alone. But taking green tea extract without caffeine does not seem to significantly reduce weight or waist circumference. (42) (43) Osteoporosis. Population research suggests that drinking green tea for ten years is associated with increased bone mineral density. (44) Prostate cancer. Chinese men who consume green tea seem to have a lower risk of developing prostate cancer. (45) Preliminary clinical research suggests that men with advanced cancer who take green tea supplements (containing catechins 200 mg three times daily) for a year seem to have a reduced risk of progression to prostate cancer. (46) Osteoarthritis
Mechanism of action. Polyphenols including flavanols, flavandiols, flavonoids, and phenolic acids are abundant in green tea. The flavanols are all referred to as catechins. These seem to be responsible for many of the proposed benefits of green tea. (19,20,48,49,50) and they may be responsible for its anti-inflammatory activity. (51) They may inhibit the production of other inflammatory substances including COX-1and 2, leukotriene-B4 and the activity of 5-lipoxygenase and nitric oxide synthase.(52, 53) Green tea catechins may also protect cartilage by inhibiting proteoglycan and collagen breakdown.(54) Green tea polyphenols seem to lessen joint degeneration in laboratory models of rheumatoid arthritis. (55) Green tea also contains plant estrogens including beta-sitosterol. (41)
Green tea contains 2% to 4% caffeine or 10-80 mg caffeine per cup.(56) a typical amount is 35-60mgs per cup. The caffeine in green tea stimulates the central nervous system (CNS), heart, muscles, and possibly blood pressure.(57) Caffeine is thought to increase the release of neurotransmitters such as dopamine.(58) Caffeine also decreases airway resistance and stimulates respiration.(59) Caffeine may decrease GABA and Serotonin neurotransmitters in the Central Nervous System. (58) Caffeine stimulates stomach acid secretion, and increases fight or flight chemicals in the body.(60) Caffeine can have positive stimulating effects on the heart.(59) Caffeine can also immediately raise blood pressure, but might not have this effect in habitual users. (57) Caffeine doesn't substantially affect the fluid status of people who drink caffeinated beverages on a regular basis. (61,62) The caffeine content is also thought to be responsible for green tea's effects on mental performance. (13) Some preliminary studies show that flavonoids found in green tea might reduce heart disease risk factors lipoprotein oxidation. However, green tea doesn't reduce inflammation, vascular reactivity, or lipid oxidation. (63,64,65,66,67) Caffeine has been reported to cause increases and decreases in blood glucose. Green tea may protect against some kinds of cancer. Green tea polyphenols also appear to have activity against human wart virus and related cervical changes and genital warts (20,68) but the mechanism of action for this is not known. The polyphenols in green tea appear to reduce the cellular adhesiveness of bacteria associated with dental disease. (38) Some evidence suggests that green tea might be useful in skin disorders such as excess hair, acne and also male pattern baldness. (70) Green tea is thought to be beneficial for preventing skin damage and cancer from ultraviolet radiation. Areas of skin where green tea extracts were applied had fewer sunburned cells and less damage to skin cells. (71) Green tea is also used for weight loss. Early evidence indicates that a green tea extract rich in catechins can increase calorie and fat metabolism. The caffeine, catechin, and theanine constituents of green tea might contribute to this effect. (72,73,74) Caffeine increases resting energy expenditure and cellular heat production. (75) Tannins in green tea can reduce diarrhea and the polyphenols in green tea might have a beneficial effect on the gut flora.. (76) For prevention of Parkinson's disease, caffeine in green tea may help to maintain levels of dopamine in the central nervous system by preventing the inhibition of dopaminergic transmission. These actions help reduce the expression of symptoms of Parkinson’s disease. (28) Protecting people from developing Alzheimer's disease has got to be a major priority for aging Western populations. Early studies suggests that catechins in Green tea may prevent oxidation and cell death of neurons, which may help resist cell damage and maintain health. (77) Population studies suggest that drinking green tea for at least ten years increases bone mineral density. The exact mechanism for the effects on bone is unknown, but several possibilities have been suggested. Tea leaves contain fluoride, which might slow osteoporosis. Tea also contains flavonoids and phytoestrogens, which might affect bone mineral density. Other proposed mechanisms include inhibition of bone resorption and effects on mineral metabolism by polyphenols and tannins. (44)
Adverse reactions.
Green tea can cause digestive upset and dizziness, insomnia and agitation and confusion. These effects are more common with higher doses of green tea or green tea extract, equivalent to 5-6 liters of tea per day.(9,78) There have been at least 14 cases of liver toxicity, usually linked to green tea extract products in pill form. (79,80) However, there has been at least one report associated with consumption of a green tea-containing beverage. (80) In most reported cases, green tea products were not assessed to determine if any contaminants were present. In most cases, liver function returned to normal after discontinuation of the green tea product. (79,80)
Interaction with herbs and supplements.
Anticoagulant/antiplatelet herbs and supplements: There have been no reported cases of interaction with warfarin (this a pharmaceutical blood thinning agent). Caffeine containing herbs and supplements: Other natural products that contain caffeine include coffee, black tea, oolong tea, guarana, mate, cola, and others. Some supplements for energy may contain caffeine; check the label. Avoid large amounts of green tea along with supplements aimed at the market for sportspeople that contain creatine, caffeine or ephedra.(83,84) Liver toxic herbs and supplements: Theoretically, avoid taking green tea supplements with other hepatotoxic herbs or supplements as there might be additive effects. (79,85) Check out herbs you want to use with Green Tea and avoid the combination if there are concerns about liver function. Iron: Like black tea, green tea appears to reduce absorption of iron from foods. (86,87) However, a study of iron-deficient elderly patients suggests that concomitant use doesn't alter iron absorption in this population. (89) Iron levels are not affected in people with adequate iron intake. Theoretically, green tea might reduce the absorption of iron supplements. For most patients, this effect will not be clinically significant. On this account patients with iron deficiency are advised to consume black tea and green tea between meals. (87)
Interactions with drugs. There is preliminary evidence that green tea might enhance the effects of doxorubicin (Adriamycin) on cancer cells. (69) Caffeine accounts for most of the side effects for green tea. If you are on medication or need to start medication read the drug insert leaflet carefully. If there is an interaction with caffeine, or black tea or coffee be aware that green tea may have the same interaction.
Stimulants. Read the drug leaflet any nervous system stimulation medicine including amphetamines.
Drugs that inhibit caffeine metabolism; These include cimetidine (reduces stomach acid), fluconazole (anti-fungal), mexilitene (prescribed for heartbeat irregularities), fluvoxamine (antidepressant). Avoid green tea supplements or consult a medical herbalist. Drugs that decrease caffeine clearance: terbinafine (prescribed for fungal infection of toe nails), quinolone antibiotics (the commonest prescribed is ciproflaxacin, apart from nalidixic acid all others end with –acin). Hepatotoxic drugs. Avoid of green tea supplements. Estrogens. The effect of caffeine on estrogens is complicated and depends on race and the dose of caffeine. High caffeine levels can elevate estrogens and low doses can stimulate. An average amount in daily intake of green tea is unlikely to be clinically significant but may be relevant to supplement doses.93 Drugs that reduce caffeine clearance; theophylline. Warfarin. No reports have been noted with normal consumption, observe the usual vigilance. Interactions with foods. Avoid excess caffeine intake when used in conjunction with black tea and coffee. Because the effects of caffeine are dose related avoid excessive amount of caffeine intake. The amount of caffeine in coffee is extremely variable, check the packaging or server, black tea averages 30-80mgs per cup. Check the amount in soft drinks and avoid high caffeine energy drinks. Green tea appears to reduce absorption of iron from non-meat food sources. If you are concerned about this drink green tea between meals. Adding milk to your green tea may reduce the benefits of green tea as the milk may reduce the absorption of some of the helpful constituents. Interaction with laboratory tests. Inform your medical provider if you are taking green tea supplements. Drinking 4-6 cups of green tea per day is unlikely to affect laboratory tests any more than 1-3 cups of coffee. Interactions with diseases and conditions. Generalized anxiety or nervous excitability: avoid caffeinated beverages or supplements. Diabetes: caffeine may affect the presentation of hypoglycemic attacks. Avoid sudden increases or decreases of caffeine intake and monitor blood sugars more carefully if changing the amount of caffeine in your diet. Glaucoma: Intake of caffeinated beverage (>/=180 mg caffeine) may not be recommended for patients with normotensive glaucoma or ocular hypertension.
Bleeding time: Caffeine is reported to have antiplatelet activity however, this interaction has not been reported in humans. Heart rhythm irregularities: Caffeine in green tea can induce cardiac arrhythmias in sensitive individuals use with caution.
Dosage. It is difficult to be precise with dosage of green tea as much depends on the duration of brewing and the quality of the raw herb. Infusion: 1-6 cups for men per day and 1-4 cups for women per day if using one tsp. of the herb per cup of boiling water. Powder/capsule: 1500 mg per day. Ostearthritis Oral: Doses of green tea vary significantly, but usually range between 1-10 cups daily. The commonly used dose of green tea is based on the amount typically consumed in Asian countries, which is about 3 cups per day, providing 240-320 mg of polyphenols. The typical dose of caffeine:
References.
Jpn J Cancer Res 1988;79:1067-74.
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