Unprocessed foods include the natural edible food parts of plants and animals, like nuts and grains. Minimally processed foods have been slightly altered for the main purpose of preservation but which does not substantially change the nutritional content of the food, like cheese and bread.
Vitamin C. Vitamin C and its various forms (ascorbic acid, magnesium ascorbyl phosphate, etc.) are considered an effective antioxidant for the skin and help to lighten skin. One study found it raises glutathione levels in the body.