About vitamin cwater soluble vitamin, antioxidant.mechanism of action of vitamin cvitamin c exerts it`s action by influencing the biologic oxidations and reductions used in cellular respirations. it directly stimulates collagen synthesis and maintains intracellular connective tissue. it involves in various metabolic reactions such as 1).hydroxylation of praline and lysine residues of protocollagen which is essential for formation and stabilization of collagen triple helix, 2).hydroxylation of carnitine, 3).conversion of folic acid to folinic acid, 4).biosynthesis of adrenal steroids, catecholamines, oxytocin, and adh, 5).metabolism of cyclic nucleotides and prostaglandins. vitamin c is important in resistance to infections.sinteractions for vitamin coral contraceptives and estrogens: vitamin c increases serum levels of oestrogen resulting in adverse reactions . warfarin: the anticoagulant effects of warfarin is reduced.