Vitamin C is required for many functions in the body. Helping to support the immune system and normal functioning of the nervous system and increasing iron absorption. Comes in a great value 1 year supply. Features of Nutri Within vitamin C 1000mg 365 tablets 1 year\'s supply Contributes to the protection of cells from oxidative stress Supports the immune system Contributes to maintenance of normal function of the immune system during and after extreme physical exercise Supports collagen formation for the normal function of blood vessels, bones, cartilage, gums, skin, and teeth Contributes to normal psychological function Supports normal functioning of the nervous system Increases Iron absorption Contributes to the regeneration of the reduced form of vitamin E