Vitamin B9 (folic acid) — answers to folic acid / folate
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The synthetic, more stable form of vitamin B9, a water-soluble vitamin the body needs to make DNA and new cells.
Why it’s used
Taken to meet daily folate needs, particularly to support normal fetal neural tube development during pregnancy, and to correct or prevent folate deficiency.
What the evidence is for
reducing neural tube defect risk when taken before and during early pregnancy, and correcting folate deficiency.
What the evidence says
According to the NIH Office of Dietary Supplements, folic acid supplementation before and during early pregnancy is well established to reduce the risk of neural tube defects, and correcting deficiency reliably raises blood folate levels. Evidence for other claimed benefits, such as mood or cardiovascular effects, is weaker and unsettled.
Dose studied
400–1000 mcg — adult RDA (as dietary folate equivalents) up to the tolerable upper intake level for synthetic folic acid, per NIH ODS.
Context
Public health guidance for neural tube defect risk reduction is generally built around an intake of 400 micrograms of folic acid daily beginning before conception, per NIH ODS; the adult RDA and tolerable upper intake level are set separately for synthetic folic acid versus food folate.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.