Vitamin C has got a direct antioxidant capacity  and contributes to  protecting cells from the harmful effects of oxidative free radicals , for example during immunological activation or when our skin is exposed solar radiation. The human body actually counts on  layers of fatty acids , especially skin and intestinal or lung epithelium, which are  susceptible to oxidation. Vitamin C is involved in the well-being of these structures .

Evidence also suggests that vitamin C provides an indirect antioxidant effect by regenerating other biologically important antioxidants such as glutathione and vitamin E to their active state.

Vitamin C is highly concentrated in immune cells  like white blood cells and in  skin  cells.

In the skin, it participates in the repair processes and in the formation of collagen , which not only favors a better appearance (in terms of wrinkles), but also maintains the skin structure, the first immunological barrier against external aggressions .

In immune cells (for example  white blood cells )  its concentration is 50 to 100 times higher  than that in blood, and this fact details a  relevant role in maintaining phagocytosis  and the regulation of oxidation to face possible aggressive agents.