<prompt> The main function of Vitamin C in the body is -Coenzyme for energy metabolismRegulation of lipid synthesisInvolvement as antioxidantInhibition of cell growth  <response>: Ans. is c i.e., Involvement as antioxidant Vitamin C Ascorbic acido Ascorbic acid Vitamin C is also called antiscorbutic factor. It is very heat labile, especially in basic medium. Ascorbic acid itself is an active form. Maximum amount of vitamin C is found in adrenal cortex,o Ascorbic acid functions as a reducing agent and scavanger of free radicals antioxidant. Its major functions are:- In collagen synthesis: - Vitamin C is required for post-translational modification by hydroxylation of proline and lysine residues converting them into hydroxyproiine and hydroxy lysine. Thus vitamin C is essential for the conversion of procollagen to collagen, which is rich in hydroxyproiine and hydroxylysine. Through collagen synthesis, it plays a role in formation of matrix of bone, cartilage, dentine and connective tissue.Synthesis of norepineph rine from dopamine by dopamine-b-monoxygenase dopamineb-hydroxylase requires Vitamin C.Carnitine synthesisBile acid synthesis :- 7-a-hydroxylase requires vitamin C.Absorption of iron is stimulated by ascorbic acid by conversion of ferric to ferrous ions.During adrenal steroid synthesis, ascorbic acid is required during hydroxylation reactions.Tyrosine metabolism : - Oxidation of P-hydroxy-phenylpyruvate to homogentisate.Folate metabolism : - Folic acid is converted to its active form tetrahydrofolate by help of Vitamin C. 