One of the most well-known and essential vitamins for the human body is Vitamin C. It is a powerful antioxidant which protects the cells from oxidative stress and the negative effects of free radicals. Free radicals are molecules which negatively affect the body. They may cause chronic health problems such as cataracts, cancer, inflammatory diseases and cardiovascular disorders. Vitamin C prevents free radicals from tissue damage. The recommended dose of Vitamin C is 75 milligrams for women and 90 milligrams for men per day.