Vitamin C, also known as ascorbic acid, is a water-soluble vitamin that is essential for human health. It plays a central role in the body's immune system, contributes to the formation of collagen which is essential for skin, tendons and blood vessels, and acts as a powerful antioxidant that protects cells from damage caused by free radicals. Food sources rich in vitamin C include citrus fruits, berries, peppers, broccoli and spinach.
Humans are not able to produce vitamin C themselves and therefore it must be supplied through diet or supplements. An adequate intake of vitamin C is essential for maintaining general health, strengthening the immune system and promoting collagen formation. A lack of vitamin C can lead to scurvy, a disease characterized by fatigue, sore gums and non-healing wounds.