Vitamin C or ascorbic acid is a water-soluble vitamin that is naturally present in foods, such as: citrus fruits, kiwi, strawberries, papaya, parsley, red and green peppers, vegetables (broccoli, cabbage, spinach). Vitamin C can also be added to some foods or obtained through dietary supplementation. Vitamin C, known for its importance in the immune system, is necessary for the production of collagen (protein that provides resistance to bone, dentition, tendons and walls blood vessels) and certain neurotransmitters, is involved in protein metabolism and also has antioxidant power and the ability to regenerate other antioxidants in the body such as Vitamin E. This vitamin also promotes increased iron absorption. Initial symptoms of vitamin C deficiency include fatigue, malaise, and inflammation of the gums.