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Camellia sinensis
This herb may interact with medications you are taking. Review the interactions table below and consult your healthcare provider before use.
Green tea is made from the unoxidized leaves of Camellia sinensis and has been consumed in China and Japan for thousands of years. It is one of the most studied beverages for its health benefits, particularly its high concentration of catechins and L-theanine. It provides a unique combination of alertness and calm.
Green Tea (Camellia sinensis) is one of the most studied beverages for health effects. Level A evidence supports cognitive benefits and cardiovascular risk reduction.
EGCG inhibits COMT, modulates cell signaling pathways, and has antioxidant activity. Caffeine-theanine combination enhances alpha brain wave activity.
Cognitive function
Improves attention and memory
Cardiovascular risk
20-30% risk reduction with 2-3 cups daily
Weight management
Modest effect on fat oxidation
Type 2 diabetes
May improve insulin sensitivity
| Drug | Severity | Description |
|---|---|---|
| Warfarin (Coumadin) | Severe | Green tea contains vitamin K which can reduce warfarin effectiveness. Large or inconsistent intake may cause significant INR fluctuations. |
| Folic Acid Supplements | Mild | Green tea catechins may reduce folic acid absorption, potentially reducing effectiveness of supplementation. |
| Iron supplements | Moderate | Green tea polyphenols can reduce iron absorption by up to 64%, potentially worsening iron deficiency. |
| Atorvastatin (Lipitor) | Mild | Green tea catechins may increase atorvastatin blood levels, potentially increasing both effectiveness and side effects. |
| Nadolol | Moderate | Green tea may reduce the absorption and blood levels of nadolol, potentially reducing its blood pressure-lowering effect. |
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