Home ยป 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