Uses: Green tea contains caffeine and it has been used to increase alertness. Green tea has also been used for cancer prevention, to lower cholesterol, and to prevent/delay Parkinson's disease. Some herbal/diet supplement products have been found to contain possibly harmful impurities/additives. Check with your pharmacist for more details regarding the particular brand you use. The FDA has not reviewed this product for safety or effectiveness. Consult your doctor or pharmacist for more details.