Green Tea

Herbal Supplements

Peer Reviewed

Green tea comes from the leaves of a large shrub-like plant. Green tea contains bioflavonoids, caffeine, fluoride, polyphenols, tannins, and vitamin C. Polyphenols are primarily responsible for the therapeutic action of green tea. Green tea has antioxidant and antibacterial properties.
Oriental cast iron tea pot with tea cup and autumn leaves on tatami matGreen tea is consumed to help prevent cancer, lower cholesterol, improve circulation (keeps blood platelets from sticking together), regulate blood sugar, improve digestion, control diarrhea, increase mental acuity, and neutralize poisons. Its antibacterial properties may make it useful in fighting infection (eg, colds, sore throats).

Sources of GreenTea
Green tea is available in the following forms: dried tea leaf, liquid extracts, and capsules. For maximum benefits, purchase standardized products.

Guidelines and Cautions
Always follow package directions.

  • Excessive green tea consumption may cause irritability, insomnia, dizziness, heart palpitation, vomiting, diarrhea, and/or headache.
  • Green tea contains vitamin K, which can make anticoagulant medicines less effective. Consult your health care professional if you are using them.
  • Women who are pregnant or nursing should not consume green tea.

Do not consume green tea if any of the following exist:

  • Anxiety disorder
  • Irregular heartbeat
  • Taking alkaline drugs

Disclaimer: Many people report feeling improvement in their condition and/or general well-being taking dietary, vitamin, mineral, and/or herbal supplements. The Editorial Board of, however, cannot endorse such products since most lack peer-reviewed scientific validation of their claims. In most cases an appropriate diet and a "multiple vitamin" will provide the necessary dietary supplements for most individuals. Prior to taking additional dietary, vitamin, mineral, and/or herbal supplements it is recommended that patients consult with their personal physician to discuss their specific supplement requirements.

Updated on: 01/22/19
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Grape Seed Extract
Vincent Traynelis, MD
Although many patient's describe improvement in their condition after taking one of the supplements previously described, the Editorial Board is unable to endorse these supplements, as there is insufficient peer reviewed research available. Hopefully the role of these compounds will be better understood once more scientific research is compiled.
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Grape Seed Extract

Grape seed extract is an herbal preparation made from grapes. The extract contains oligomeric proanthocyandin (OPC), an important antioxidant.
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