Folic acid is the synthetic form of vitamin B9, a water-soluble nutrient your body needs to make DNA, divide cells, and build red blood cells. It also helps turn food into usable energy and supports normal growth and development.
Women who are pregnant or trying to conceive rely on folic acid to lower the risk of neural tube defects in the fetus. It keeps homocysteine levels in a normal range, which matters for heart health. Some people use it to brighten mood, particularly when their folate status is low.
Standard daily doses sit between 400 and 800 mcg, taken with food. You will find it in multivitamins and single-ingredient pills. Do not exceed 1,000 mcg a day without a doctor's guidance.
Watch for these cautions: extra folic acid can hide a vitamin B12 shortage and delay the catch of pernicious anemia. The supplement may clash with methotrexate and some seizure drugs. Anyone with a history of colorectal polyps or cancer should keep high doses under medical watch.