4 Green tea may stimulate the immune system to help defend the body against bacterial infections, including dental plaque. 5 Green tea has antibacterial properties and stimulates the production of immune cells . However, since such high levels of caffeine can cause other complications, this therapy should not be undertaken without a health provider's consultation. Three cups daily. The efficacy of these preparations compared to the consumption of the tea itself is not known at this point.
Green tea contains caffeine.
People taking the class of antidepressant called MAO inhibitors may want to avoid the caffeine in green tea. Green tea composition, consumption, and polyphenol chemistry. In vivo antioxidant effect of green tea in man. Stensvold I, Tverdal A, Solvoll K, et al. Relationship to cholesterol, blood pressure, and coronary and total mortality.