“Glutathione” is an antioxidant which is produced within the cells of the liver in the human body. It plays an important role in strengthening our metabolism and immune system. It also regulates nitric oxide cycle and remove free radicals from our body. This antioxidant is also used in the treatment of various diseases like diabetes, liver cancer, breast cancer and Parkinson’s disease. Foods that are rich in this antioxidant are: milk, garlic, tomatoes, grapefruit, apples and bananas.