<prompt> Following Vitamin Prevents Peroxidation of lipids of cellular levelVitamin AVitamin CVitamin EVitamin K  <response>: Vitamin E is the most powerful natural antioxidant. Free radicals are continuously being generated in living systems. Their prompt inactivation is of great impoance. Vitamin E is a known biological antioxidant able to quench the lipid peroxidation chain and to protect the plasma membranes from the attack of free radicals. Vitamin E protects RBC from hemolysis. By preventing the peroxidation, it keeps the structural and functional integrity of all cells. It protects the polyunsaturated fatty acids PUFA from peroxidation reactions. Vitamin E acts as a scavenger and gets itself oxidized to quinone form by free radicals R and spares PUFA Gradual deterioration of the ageing process is due to the cumulative effects of free radicals. Vitamin E also boosts the immune response Ref: DM Vasudevan - Textbook of Biochemistry, 8th edition, page no: 461 