<prompt> Major function of Vitamin E in the body ?Regulation of energy metabolismCarboxylation reactioBlood clottingProtection of biological membrane from free radical damage  <response>: Ans. is d i.e., Protection of biological membrane from free radical damage The most impoant function of vitamin E in human beings is to act as an anti-oxidant. It prevents the oxidation of other antioxidants, .e.g, carotenes, vitamin A and vitamin C. Vitamin E is the lipid-soluble antixodant in cell membranes and plasma lipoproteins. The main function of vitamin E is as a chain-breaking, free radical-trapping antioxidant in cell membranes and plasma lipoproteins by reacting with lipid peroxide radicals formed by peroxidation of polyunsatured fatty acid. Vitamin E prevents rancidity of fats due to its antioxidant action. 