Vitamin C contributes to the normal function of the immune system. It is also a powerful antioxidant, which helps build and maintain connective tissue in the body, including bones, blood vessels and skin, helping to heal wounds.
Unlike most animals, humans are unable to produce vitamin C in the body, so need to consume it via the diet. As vitamin C is water-soluble, it is not stored in the body and we need to consume it every day.
Fruits and vegetables contain good levels of vitamin C, but as these foods may not form a large part of the everyday diet today, it is often useful to take a supplement.