Folic Acid (Folate) Supplements: Benefits, Dosage and Safety
Folic acid supplements are essential for anyone who could become pregnant: 400 mcg a day, started before conception, prevents most neural tube defects. Beyond pregnancy, most people get enough folate from food and fortified grains.
Evidence at a glance
| Use | Grade | What the research shows |
|---|---|---|
| Preventing neural tube defects | A | 400 mcg daily before conception sharply lowers risk. |
| Heart disease prevention | D | Lowering homocysteine didn't reduce heart events. |
A: strong, consistent human evidence · B: moderate · C: limited or mixed · D: good evidence of no benefit.
Folate is needed to make DNA and red blood cells. Folic acid is the synthetic form used in supplements and fortified foods.
How to take it
Take 400 mcg daily starting at least a month before trying to conceive; a prenatal vitamin usually covers it. See fertility supplements.
Safety and interactions
High folic acid intake can mask vitamin B12 deficiency. Stay under 1,000 mcg a day unless prescribed. Folic acid is prescribed alongside methotrexate in some conditions.
Always tell your doctor and pharmacist about the supplements you take. Check combinations with our interaction checker.
Sources
This page is for education and is not a substitute for advice from your doctor. Read our medical disclaimer.