Folic Acid: What It Is and Why It Is Used

Folic acid is a B vitamin used before and during pregnancy to support early development of the baby's brain and spinal cord.

It is the supplemental form of folate, a B vitamin involved in making DNA and forming new cells. The body uses folate during periods of rapid growth, including the earliest stage of pregnancy, when the neural tube develops into the baby's brain and spinal cord. Folic acid is found in tablets and in some fortified foods. A clinician or pharmacist can help you choose a suitable product, especially if you take other medicines or have a condition that affects absorption.

Folic acid supports cell division and normal blood-cell formation. It is converted into active folate forms that participate in one-carbon reactions, which help build genetic material and process certain amino acids. A balanced diet supplies folate from foods such as leafy vegetables, beans and fortified grains, while a supplement provides a measured amount. Folic acid does not treat every cause of anaemia, so unexplained tiredness or abnormal blood results need a proper assessment.

Folic acid is commonly included in preconception planning and antenatal care. Starting it before conception matters because early fetal development can begin before pregnancy is recognised. Some people need an individually selected dose or closer advice because of medical history, previous pregnancy outcomes, medication use or absorption problems. It may also be prescribed when a blood test shows folate deficiency. Follow the product instructions and tell your care team about all supplements you use.

Folate-rich foods can complement a supplement but may not replace a prescribed plan around pregnancy. Useful choices include spinach and other leafy greens, beans, lentils, citrus fruits and fortified grains. Products may contain folic acid alone or alongside other vitamins. The right option depends on your diet, pregnancy plans, laboratory results and medicines, so compare labels with a clinician rather than taking several overlapping products.

If you could become pregnant, discuss folic acid during a preconception visit or as soon as pregnancy is planned. Take it consistently as directed, and mention nausea, difficulty swallowing tablets or concerns about interactions. Do not double a missed dose unless a clinician tells you to. A supplement is one part of pregnancy preparation; appointments also cover medicines, vaccinations, long-term conditions and nutrition. You can read about [Preconception Care](/treatments/pregnancy-and-birth-care/preconception-care/) and [Antenatal Care Package](/treatments/pregnancy-and-birth-care/antenatal-care-package/).

Folic acid is generally well tolerated when used as directed, but more is not automatically better. Keep supplements out of children's reach and check combination products to avoid taking duplicate ingredients. Tell your clinician if you have a vitamin B12 problem, kidney or liver disease, or take long-term medicines. Seek advice about persistent symptoms rather than extending treatment on your own. Your clinician can decide whether supplementation should continue and whether blood tests are needed.