Folate vs folic acid: What every woman should know

Key takeaways

• Folate is the naturally occurring form of vitamin B9 found in foods like leafy greens, lentils, and citrus. Folic acid is the synthetic form added to fortified foods and most supplements.

• Your body converts folic acid into the active form, methylfolate (5-MTHF), before it can be used.

• About 1 in 3 people in the United States carry at least one MTHFR genetic variant that slows that conversion, according to the CDC.

• The CDC continues to recommend folic acid for neural tube defect prevention because that is the form decades of public-health research have used. Methylfolate at an adequate dose is a research-backed alternative for daily nutrition.

Folate vs folic acid: the short answer

Folate and folic acid are both forms of vitamin B9, but they are not identical. Folate is the naturally occurring form in foods like leafy greens, lentils, and citrus. Folic acid is the synthetic version added to fortified foods and most supplements. Your body must convert folic acid into methylfolate (5-MTHF) before it can use it, and roughly 1 in 3 women carry a genetic variant that slows that conversion.

That single line is the answer to "folate vs folic acid." The full picture matters more, because it changes how you should think about what is in your prenatal vitamin, what is on your dinner plate, and what your body is actually able to use.

What is folate?

Folate is vitamin B9. It is water-soluble, which means your body does not store much of it, so you need a steady supply from food or supplements. According to the NIH Office of Dietary Supplements, folate plays a central role in DNA synthesis, red blood cell production, and methylation, the chemical process that helps your body build and repair nearly every cell.

In food, folate exists in many natural forms, often called food folates or polyglutamates. When you eat them, your gut breaks them down and your liver converts them into the active form your cells use, 5-methyltetrahydrofolate (5-MTHF), also known as methylfolate.

Daily folate needs are measured in micrograms of dietary folate equivalents (mcg DFE), a unit that adjusts for differences in absorption between food folate and synthetic folic acid. Per the NIH, the recommended intakes are:

• Adults (19+): 400 mcg DFE

• Pregnancy: 600 mcg DFE

• Lactation: 500 mcg DFE

• Children (4-8): 200 mcg DFE

• Teens (14-18): 400 mcg DFE

Folate supports more than pregnancy. Research from the Linus Pauling Institute at Oregon State University connects adequate folate intake to mood, cardiovascular health, and immune function across the lifespan.

What is folic acid?

Folic acid is the synthetic, monoglutamate form of vitamin B9. It was developed in the 1940s and chosen for fortified foods because it is shelf-stable, inexpensive, and easy to standardize.

In 1998, the FDA mandated folic acid fortification of enriched grain products in the United States. The reason was simple and important: folic acid supplementation before and during early pregnancy reduces the risk of neural tube defects, a class of serious birth defects affecting the spine and brain. The CDC reports that fortification prevents an estimated 700 additional neural tube defects in the U.S. each year.

That public-health win is real, and it is worth honoring. But "the only form proven to prevent NTDs in large population studies" is a different claim than "the best form for every individual woman to absorb day to day." Both can be true. The science of how the body actually uses folic acid has moved forward in the decades since fortification began.

Folate vs folic acid during pregnancy

Pregnancy is when this distinction matters most, because folate demand jumps from 400 mcg DFE to 600 mcg DFE per day, and the consequences of inadequate intake are well documented.

What folic acid proved

The connection between folate and neural tube defects was established in the 1970s, and large randomized trials in the 1980s and 1990s confirmed that 400 mcg of folic acid daily, started before conception, reduces NTD risk substantially. The CDC currently states that folic acid is the only form of folate shown in those studies to prevent NTDs. That language is precise and worth quoting carefully: it reflects the form the studies used, not a finding that other forms fail.

Why methylfolate is gaining traction in prenatal nutrition

More recent research has examined what 5-MTHF does in pregnancy directly. The Carboni 2022 review reported that supplementation with 5-MTHF increases plasma folate more efficiently than folic acid and does not produce the same UMFA accumulation.

A 2024 randomized controlled trial published in Reproductive BioMedicine Online studied 103 pregnant women in Australia and found that maternal serum UMFA was lower in women supplemented with active folate compared with folic acid at the same dose. The clinical significance is still being studied, but the pharmacokinetic case for methylfolate is now well-established in peer-reviewed literature.

For the longer policy story behind why ACOG and CDC continue to recommend folic acid even as research advances, our companion piece on why ACOG and CDC still recommend folic acid goes deeper.

What about breastfeeding?

A 2023 study in Scientific Reports found that human milk contains higher concentrations of UMFA when nursing parents supplement with folic acid compared with (6S)-5-methyltetrahydrofolate. Breastfeeding women who want to limit UMFA exposure for their infants have a research-backed reason to choose a methylfolate postnatal.

Folate or folic acid: which should you take?

Here is a situation-by-situation guide. Talk with your practitioner before starting any new supplement, especially during pregnancy.

• Trying to conceive: Methylfolate at 600+ mcg DFE, started at least three months before conception. Egg quality and early pregnancy nutrition both depend on adequate folate.

• Pregnant, no MTHFR testing: Methylfolate. It works for women with and without MTHFR variants, so it covers both possibilities.

• Pregnant, confirmed MTHFR variant: Methylfolate, strongly preferred. Your body's conversion of folic acid is meaningfully reduced.

• Postpartum or breastfeeding: Methylfolate, to limit UMFA in breast milk and support recovery.

• Perimenopausal or postmenopausal: Methylfolate, to support methylation, mood, and cardiovascular health as estrogen declines.

• Following a U.S. diet with fortified grains: You are likely already getting folic acid from bread, cereal, and pasta. Choosing methylfolate in your supplement helps balance the form your body has to work with.

The shared answer across every situation: methylfolate is usable by every woman. Folic acid works for many but not all. If you can choose the form that works for everyone, that is usually the better default.

How to find a methylfolate prenatal

Most prenatal vitamins on the shelf still use folic acid. Reading the label is the only way to know what you are getting.

On the Supplement Facts panel, look for one of these forms:

• 5-methyltetrahydrofolate (5-MTHF)

• L-methylfolate

• Calcium L-5-methyltetrahydrofolate

• Methylfolate

• Quatrefolic (a branded form of glucosamine salt 5-MTHF)

Watch for the parenthetical phrasing: A label that reads "Folate (as folic acid)" is folic acid. A label that reads "Folate (as L-methylfolate)" or "Folate (as 5-MTHF)" is methylfolate. The word "folate" alone in the nutrient column is not enough.

Check the dose. Pregnancy needs are 600 mcg DFE per day from all sources. Most quality prenatals provide that or more.

Check the support nutrients. Folate cannot do its job alone. It works in concert with vitamins B6 and B12 and with choline, which supports methylation through a parallel pathway. A prenatal that delivers methylfolate but skimps on B12 or choline is only doing part of the work.

Prenatal Multi Essentials is formulated with 918 mcg DFE of methylfolate alongside the active forms of B6 and B12 and 400 mg of choline per serving, so the full methylation system is supported. You can also explore the full pregnancy supplement collection and, for pre-conception, our fertility supplement collection.

Foods rich in folate

Even with a good prenatal, food remains a primary folate source. Per the NIH Office of Dietary Supplements, here are the densest natural sources:

Two practical notes:

1. Folate is heat-sensitive. Boiling can cut folate content meaningfully, especially in leafy greens. Steaming, sauteing briefly, or eating raw preserves more.

2. Food folate is not always enough. Even women with high folate intakes can fall short during pregnancy because needs jump 50%, and morning sickness or food aversions in the first trimester make it harder to eat the foods that would deliver it.

Common questions about folate vs folic acid

Why do doctors still recommend folic acid?

Most clinical guidelines in the U.S., including the CDC's, recommend 400 mcg of folic acid because that is the form used in the large randomized trials that established folate's role in NTD prevention. Updated recommendations follow updated evidence, and policy moves more slowly than the research literature. The Carboni 2022 review and our companion piece, why ACOG and CDC still recommend folic acid, unpack that gap in detail.

Is it okay to take folate (methylfolate) instead of folic acid during pregnancy?

A well-formulated methylfolate prenatal that delivers at least 600 mcg DFE provides the active form of vitamin B9 your body uses, and it works for women with and without MTHFR variants. The CDC currently recommends folic acid because that is the form the foundational NTD-prevention studies used. Methylfolate is a research-backed alternative for daily nutrition and is the form that does not require conversion, but talk with your practitioner about your individual situation.

Can you take too much folate?

Yes, in the sense that more is not always better. The tolerable upper intake level for synthetic folic acid is 1,000 mcg per day from supplements and fortified foods, set by the Institute of Medicine to limit the chance of masking a vitamin B12 deficiency. Methylfolate does not have an established upper limit, but excessively high doses of any methyl nutrient are not a goal. Stick to formulations that meet pregnancy DFE needs without going far beyond them.

Does taking methylfolate make you feel different than folic acid?

Some women report energy or mood changes after switching to methylfolate, especially those with MTHFR variants. The plausible mechanism is improved methylation, since 5-MTHF feeds directly into the production of neurotransmitters like serotonin and dopamine. Research is ongoing, and individual responses vary.

The bottom line

Folate and folic acid are both forms of vitamin B9, but they are not interchangeable in your body. Folic acid was the right tool for population-level fortification, and the public-health success of NTD prevention is real. Methylfolate is the form your cells actually use, and it works whether or not you carry an MTHFR variant. For women in 2026, choosing methylfolate is choosing the form that closes the gap between what is on the label and what your body can use.

If you have ever picked up a prenatal and wondered what "folate (as folic acid)" really means for you, you now have the answer. Read the label. Look for 5-MTHF, L-methylfolate, or methylfolate. Pair it with B12, B6, and choline. Eat the leafy greens, the lentils, and the citrus. Your body will use what you give it.

To find a prenatal built around methylfolate at the doses pregnancy actually requires, explore Prenatal Multi Essentials.

Sources

1. National Institutes of Health Office of Dietary Supplements. Folate Fact Sheet for Health Professionals. Updated 2024. https://ods.od.nih.gov/factsheets/Folate-HealthProfessional/

2. Linus Pauling Institute. Folate. Oregon State University Micronutrient Information Center. https://lpi.oregonstate.edu/mic/vitamins/folate

3. Centers for Disease Control and Prevention. Folic Acid: Facts for Clinicians. Updated May 20, 2025. https://www.cdc.gov/folic-acid/hcp/clinical-overview/index.html

4. Carboni L. Active folate versus folic acid: the role of 5-MTHF (Methylfolate) in human health. Integr Med (Encinitas). 2022;21(3):36-41. https://pmc.ncbi.nlm.nih.gov/articles/PMC9380836/

5. Centers for Disease Control and Prevention. MTHFR Gene Variant and Folic Acid Facts. https://www.cdc.gov/folic-acid/data-research/mthfr/index.html

6. Carboni L. Active folate versus folic acid: the role of 5-MTHF in human health. Integr Med (Encinitas). 2022;21(3):36-41. https://pmc.ncbi.nlm.nih.gov/articles/PMC9380836/

7. Yang QH, Botto LD, Erickson JD, et al. Ethnogeographic prevalence and implications of the 677C>T and 1298A>C MTHFR polymorphisms in US primary care populations. https://pmc.ncbi.nlm.nih.gov/articles/PMC6630484/

8. Pfeiffer CM, Sternberg MR, Fazili Z, et al. Unmetabolized folic acid is detected in nearly all serum samples from US children, adolescents, and adults. J Nutr. 2015;145(3):520-531. https://pmc.ncbi.nlm.nih.gov/articles/PMC4336532/

9. Best KP, et al. Maternal serum unmetabolized folic acid concentration following multivitamin and mineral supplementation with or without folic acid after 12 weeks gestation: a randomized controlled trial. Reprod Biomed Online. 2024. https://pubmed.ncbi.nlm.nih.gov/38783413/

10. Page R, Wong A, Arbuckle TE, et al. Human milk unmetabolized folic acid is increased following supplementation with synthetic folic acid as compared to (6S)-5-methyltetrahydrofolic acid. Sci Rep. 2023;13:11298. https://www.nature.com/articles/s41598-023-38224-4

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