What Is Folic Acid?
Folic acid is a form of folate, also called vitamin B9. The body uses folate to make DNA and healthy red blood cells. Folic acid is found in supplements and fortified foods.
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What Is Folic Acid Used For?
Folic acid supplements treat or prevent folate deficiency, which can cause a type of anemia. Taking folic acid before and early in pregnancy reduces the risk of neural tube defects. It can also be prescribed when a health condition or medicine increases folate needs.
How Does Folic Acid Work?
The body converts folic acid into forms it can use for cell growth and DNA production. Rapidly growing tissues and developing red blood cells need enough folate. Adequate intake around conception supports early development of the brain and spinal cord.
How Is Folic Acid Taken?
Folic acid is commonly taken by mouth as a tablet or as part of a prenatal vitamin. The dose depends on whether it is used for routine supplementation or to treat a diagnosed deficiency. People who could become pregnant are generally advised to get 400 micrograms of folic acid daily.
What Are Folic Acid Side Effects and Precautions?
Folic acid is usually well tolerated at recommended doses. High supplemental doses can correct the anemia caused by vitamin B12 deficiency while leaving nerve damage untreated. Ask a clinician about the right dose if you have anemia, take interacting medicines, or have been advised to use a higher-dose supplement.
Frequently Asked Questions About Folic Acid
Is folic acid the same as folate?
Folic acid is a form of folate used in supplements and fortified foods. Folate is the broader name for vitamin B9 forms.
Why is folic acid recommended before pregnancy?
The neural tube develops very early in pregnancy. Taking folic acid before conception and during early pregnancy lowers the risk of neural tube defects.
Can folic acid treat every type of anemia?
No. Anemia has several causes, including iron and vitamin B12 deficiency, which require different assessment and treatment.
Can I take a high dose of folic acid on my own?
Ask a clinician before taking more than the recommended amount. High doses can hide signs of vitamin B12 deficiency.
References
About Folic Acid | Folic Acid. Centers for Disease Control and Prevention. https://www.cdc.gov/folic-acid/about/index.html. Date Accessed October 6, 2026.
Folate (folic acid). Mayo Clinic. https://www.mayoclinic.org/drugs-supplements-folate/art-20364625. Date Accessed October 6, 2026.
Folic Acid Safety, Interactions, and Health Outcomes | Folic Acid. Centers for Disease Control and Prevention. https://www.cdc.gov/folic-acid/about/safety.html. Date Accessed October 6, 2026.
Folic Acid: Facts for Clinicians | Folic Acid. Centers for Disease Control and Prevention. https://www.cdc.gov/folic-acid/hcp/clinical-overview/index.html. Date Accessed October 6, 2026.
Mayo Clinic Q and A: Get the Facts Before Taking Folic Acid - Mayo Clinic News Network. Mayo Clinic. https://newsnetwork.mayoclinic.org/discussion/mayo-clinic-q-and-a-get-the-facts-before-taking-folic-acid/. Date Accessed October 6, 2026.