Green tea is used to improve cognitive performance and mental alertness. It is also used to treat stomach disorders, vomiting, diarrhea, and headaches. Green tea is also used for weight loss, osteoporosis, breast cancer, cervical cancer, prostate cancer, colon cancer, gastric cancer, lung cancer, leukemia, and skin cancer related to ultraviolet (UV) radiation (e.g., sunburn) and other environmental causes. It is also used for human papilloma virus (HPV), genital warts, perianal warts, cervical dysplasia, Crohn’s disease, Parkinson’s disease, cardiovascular disease, diabetes, hypotension, chronic fatigue syndrome (CFS), dental caries, kidney stones, and skin damage.