Vitamin C or L-ascorbic acid, or simply ascorbate, is an essential nutrient for humans.
Vitamin C is a cofactor in at least eight enzymatic reactions, including several collagen synthesis reactions that, when dysfunctional, cause the most severe symptoms of scurvy. Ascorbate may also act as an antioxidant.
Vitamin C is a natural antihistamine. For the common cold Vitamin C may reduce the duration of illness.
Vitamin C is found in high concentrations in immune cells, and is consumed quickly during infections.