Folic acid: Required for nucleoprotein synthesis and the maintenance of normal erythropoiesis; folic acid is converted in the liver and plasma to its metabolically active form, tetrahydrofolic acid, by dihydrofolate reductase; prevents neural tube defects in women of childbearing potential and higher doses required during pregnancy. Zinc: Cofactor in over 100 enzymes; plays a role in DNA synthesis; supports a healthy immune system; helps maintain a sense of smell and taste; may assist in porper function of insulin.