The Critical Role of Folate in Prenatal Health and a Proposed Shift from Folic Acid to 5-Methyltetrahydrofolate Supplementation

Folate, or vitamin B 9 , is a water-soluble vitamin essential in periconceptional nutrition. In its active form, tetrahydrofolate, it plays a vital role in DNA methylation and homocysteine breakdown. Maintenance of normal serum folate levels is crucial during pregnancy; deviation from these levels, either in dearth or excess, can lead to various pregnancy and infant complications. This article analyzes existing literature on folate’s absorption pathway in human physiology and reviews the evidence surrounding prenatal supplementation guidelines for folic acid. Prior research supports these guidelines because, in the absence of folate during pregnancy, research has shown an increased incidence of neurodevelopmental defects, food allergies, ophthalmic deficits, and other adverse effects for both mother and child. This significant body of evidence has driven most developed countries to implement folic acid supplementation initiatives, with the World Health Organization recommending a daily 400-µg folic acid supplementation for periconceptional women. As progress continues on a global scale, further efforts should be made to improve folic acid levels in pregnant populations among demographic subgroups. Research supports the use of 5-methyltetrahydrofolate in place of traditional folic acid prenatal supplements based on the increased bioavailability, resistance to genetic polymorphisms, and avoidance of several potential risks associated with folic acid supplements. More research and product development should be done to drive and support this shift in prenatal supplementation trends.