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Camellia sinensis
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.
| 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. |
| Nadolol | moderate | Green tea may reduce the absorption and blood levels of nadolol, potentially reducing its blood pressure-lowering effect. |
| Atorvastatin (Lipitor) | mild | Green tea catechins may increase atorvastatin blood levels, potentially increasing both effectiveness and side effects. |
| 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. |