Vitamin C is an antioxidant nutrient that contributes to the protection of cells from oxidative stress and to the normal functioning of the immune system. As a water-soluble nutrient vitamin C supplies in the body are used up quicker under stress leading to a lowering of immune function and increased incidence of infections.

Low levels are also associated with an increased risk of stroke and cardiovascular disease. Vitamin C helps with collagen formation for many body tissues including skin, gums, teeth, and cartilage found in joints. It enhances the absorption of iron in the body and is involved in energy metabolism and contributes to the reduction of tiredness and fatigue.