Vitamins A and D, niacin, and folic acid become activated from their inactive precursor or provitamin form.

Question

Quizplus · Accepted Answer

Vitamins A and D, niacin, and folic acid indeed have precursor forms that are converted into their active forms in the body. Vitamin A from beta-carotene, vitamin D from 7-dehydrocholesterol (in the skin, activated by sunlight), niacin from tryptophan, and folic acid is converted to its biologically active form, tetrahydrofolate, within the body.

Vitamins a and D, Niacin, and Folic Acid Become Activated