Home » Which of the following vitamins does not act as, precursor for coenzymes? Vitamins MCQs Which of the following vitamins does not act as, precursor for coenzymes? January 26, 2022 2 Views Q. Which of the following vitamins does not act as, precursor for coenzymes? A. Ascorbic acid B. Folic acid C. Thiamine D. Biotin Answer: Ascorbic acid