Evidence-based·Last reviewed May 31, 2026·How we grade evidence

Vitamin B9

VitaminBest with a meal

An essential B-vitamin needed for DNA synthesis and red blood cell formation. Strongest evidence is for preventing neural tube defects when started before conception. Most adults get enough from a fortified diet; targeted supplementation is critical for pregnancy planning and useful for documented deficiency.

Quick decision guide

May help most

Anyone who could become pregnant — start 400-800 mcg/day at least one month before conception to prevent neural tube defects.

Common dosing range

400 mcg DFE/day for adults; 600 mcg DFE/day during pregnancy.

When to expect effects

Pregnancy benefit requires 1+ month of pre-conception use. Anemia and homocysteine respond within 4-8 weeks.

Watch out for

Folic acid can mask vitamin B12 deficiency anemia while letting nerve damage progress. Don't routinely exceed 1,000 mcg/day of synthetic folic acid without checking B12.

Evidence snapshot

Neural tube defect preventionStrong

Megaloblastic anemia correctionStrong

Lowering homocysteineStrong

Depression adjunctLow

Cardiovascular event reductionLow

Cancer prevention or promotionLow

What is it

Vitamin B9 is the collective name for folate (the natural form in food) and folic acid (the synthetic form in supplements and fortified foods). It is essential for DNA synthesis, cell division, and red blood cell formation.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You could become pregnant — even months away — and want to reduce neural tube defect risk

You're pregnant or breastfeeding and a prenatal vitamin isn't covering 600 mcg/day

You have documented folate-deficiency megaloblastic anemia

You take methotrexate, sulfasalazine, or anti-epileptics (phenytoin, valproate) that lower folate

You drink heavily or have malabsorption (celiac, IBD, bariatric surgery)

Probably skip if…

You eat a varied diet with fortified grains and leafy greens — most U.S. adults meet the RDA from food alone

You're considering folic acid >1,000 mcg/day for 'general wellness' without medical guidance — risks masking B12 deficiency

You're hoping daily folic acid will lower your heart-attack or stroke risk — large RCTs (HOPE-2, SEARCH) did not show that benefit

You're using it to prevent cancer — evidence is mixed and high doses may slightly promote some cancers

Evidence at a glance

Goal	Effect	Best fit	Time
Neural tube defect prevention Strong Evidence	~70% relative reduction in NTD recurrence (MRC); ~50-70% reduction in first-occurrence NTDs when started 1+ month pre-conception	Anyone planning pregnancy, anyone who could become pregnant (USPSTF 2023 Grade A — applies regardless of intent), women with a prior NTD-affected pregnancy (higher 4 mg/day dose)	Requires folic acid at conception; start 1+ month before trying to conceive
Megaloblastic anemia correction Strong Evidence	Reticulocyte response within 1 week; hemoglobin normalization in 4-8 weeks at 1-5 mg/day	Patients with documented folate-deficiency macrocytic anemia — pregnant women, heavy drinkers, malabsorption (celiac, sprue, post-bariatric), drug-induced (methotrexate, phenytoin, sulfasalazine)	4-8 weeks
Lowering homocysteine Strong Evidence	~20-25% reduction in plasma homocysteine with 400-800 mcg/day folic acid	Documented hyperhomocysteinemia; people on drugs that elevate homocysteine	4-8 weeks
Depression adjunct Limited Evidence	Modest improvement in depression scales in some small trials; effect not consistent across RCTs	People with low or low-normal folate, SSRI partial responders (consider methylfolate via the dedicated 5-MTHF page rather than folic acid)	Weeks (8+ weeks in trials)
Cancer prevention vs promotion Mixed Evidence	Mixed; possible small benefit at dietary levels, possible small harm at high supplemental doses	Nobody — get folate from food, not high-dose supplements, for cancer-related reasons	Not established

Neural tube defect prevention

Strong Evidence

Effect: ~70% relative reduction in NTD recurrence (MRC); ~50-70% reduction in first-occurrence NTDs when started 1+ month pre-conception
Best fit: Anyone planning pregnancy, anyone who could become pregnant (USPSTF 2023 Grade A — applies regardless of intent), women with a prior NTD-affected pregnancy (higher 4 mg/day dose)
Time: Requires folic acid at conception; start 1+ month before trying to conceive

Megaloblastic anemia correction

Strong Evidence

Effect: Reticulocyte response within 1 week; hemoglobin normalization in 4-8 weeks at 1-5 mg/day
Best fit: Patients with documented folate-deficiency macrocytic anemia — pregnant women, heavy drinkers, malabsorption (celiac, sprue, post-bariatric), drug-induced (methotrexate, phenytoin, sulfasalazine)
Time: 4-8 weeks

Lowering homocysteine

Strong Evidence

Effect: ~20-25% reduction in plasma homocysteine with 400-800 mcg/day folic acid
Best fit: Documented hyperhomocysteinemia; people on drugs that elevate homocysteine
Time: 4-8 weeks

Depression adjunct

Limited Evidence

Effect: Modest improvement in depression scales in some small trials; effect not consistent across RCTs
Best fit: People with low or low-normal folate, SSRI partial responders (consider methylfolate via the dedicated 5-MTHF page rather than folic acid)
Time: Weeks (8+ weeks in trials)

Cancer prevention vs promotion

Mixed Evidence

Effect: Mixed; possible small benefit at dietary levels, possible small harm at high supplemental doses
Best fit: Nobody — get folate from food, not high-dose supplements, for cancer-related reasons
Time: Not established

Evidence for 5 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Neural tube defect prevention

Supplement benefit

Strong Evidence

The single strongest, most decisive piece of vitamin evidence in medicine. The landmark MRC trial (1991) randomized women with a prior NTD-affected pregnancy to 4 mg/day folic acid or placebo and saw a 72% reduction in recurrence. The Czeizel multivitamin trial (1992) confirmed primary prevention with 800 mcg. The Cochrane 2015 review (5 RCTs, ~6,700 women) pooled an RR of 0.31 for any NTD. Effect requires folic acid to be on board at conception — the neural tube closes by gestational day 28, before most pregnancies are confirmed.

Effect size

~70% relative reduction in NTD recurrence (MRC); ~50-70% reduction in first-occurrence NTDs when started 1+ month pre-conception

Time to effect

Requires folic acid at conception; start 1+ month before trying to conceive

Best fit

Anyone planning pregnancy, anyone who could become pregnant (USPSTF 2023 Grade A — applies regardless of intent), women with a prior NTD-affected pregnancy (higher 4 mg/day dose)

Less likely

Started after the first 4 weeks of pregnancy — neural tube has already closed

Bottom line: If pregnancy is on the table within the next year, take 400-800 mcg folic acid daily starting now. This is the highest-impact use of any supplement on this page.

SourceMRC Vitamin Study Research Group, 1991 — The Lancet Czeizel & Dudas, 1992 — New England Journal of Medicine De-Regil et al., 2015 — Cochrane Database of Systematic Reviews US Preventive Services Task Force, 2023 — JAMA — USPSTF Recommendation Statement

Megaloblastic anemia correction

Corrects deficiency

Strong Evidence

Folate deficiency causes megaloblastic (macrocytic) anemia — red cells can't divide properly because DNA synthesis is impaired. Replacement at 1-5 mg/day folic acid reliably restores hemoglobin within 4-8 weeks. The critical safety step is checking B12 first: if the anemia is actually B12 deficiency, folic acid corrects the blood picture while letting the underlying neurological damage progress.

Effect size

Reticulocyte response within 1 week; hemoglobin normalization in 4-8 weeks at 1-5 mg/day

Time to effect

4-8 weeks

Best fit

Patients with documented folate-deficiency macrocytic anemia — pregnant women, heavy drinkers, malabsorption (celiac, sprue, post-bariatric), drug-induced (methotrexate, phenytoin, sulfasalazine)

Less likely

Macrocytic anemia without documented low folate — likely B12 or other cause

Bottom line: Effective and standard-of-care for documented folate-deficiency anemia. Always check B12 before treating to avoid masking B12 deficiency.

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet

Lowering homocysteine

Biomarker support

Strong Evidence

Folate, B12, and B6 are required cofactors for converting homocysteine to methionine. Supplementing 400-800 mcg/day folic acid lowers plasma homocysteine ~20-25%. The mechanistic link is clean. What's NOT clean: lowering homocysteine has not translated into clinical cardiovascular benefit. The HOPE-2, NORVIT, VISP, and SEARCH RCTs (combined ~50,000 patients) showed B-vitamin homocysteine-lowering did not reduce heart attacks, strokes, or cardiovascular death.

Effect size

~20-25% reduction in plasma homocysteine with 400-800 mcg/day folic acid

Time to effect

4-8 weeks

Best fit

Documented hyperhomocysteinemia; people on drugs that elevate homocysteine

Less likely

Adults with normal homocysteine hoping for cardiovascular protection

Bottom line: Lowers homocysteine reliably; that biomarker change does not translate to fewer heart attacks or strokes. Don't take daily folic acid for heart-health reasons.

Evidence is mixed

Folic acid reliably lowers the homocysteine biomarker, but multiple large RCTs (~50,000 patients combined) have NOT shown a reduction in heart attack, stroke, or cardiovascular death. This is a 'biomarker that didn't pan out' — don't take folate for heart health.

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet· conflicting

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet

Depression adjunct

Disease adjunct

Limited Evidence

People with depression have somewhat lower folate levels on average. Small RCTs have tested adjunctive folic acid (or methylfolate / L-methylfolate) added to SSRIs, with mixed results. Methylfolate-prescription products (Deplin) have a small evidence base specifically for SSRI-augmentation in MTHFR-variant patients, but generic folic acid adjunct hasn't shown clear, replicated antidepressant benefit. Effect, where seen, is modest.

Effect size

Modest improvement in depression scales in some small trials; effect not consistent across RCTs

Time to effect

Weeks (8+ weeks in trials)

Best fit

People with low or low-normal folate, SSRI partial responders (consider methylfolate via the dedicated 5-MTHF page rather than folic acid)

Less likely

Adults with normal folate and adequate dietary intake

Bottom line: Not first-line for depression. If your prescriber is considering this, the methylfolate (5-MTHF) form is what's been studied for SSRI augmentation.

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet

Cancer prevention vs promotion

Mechanism only

Mixed Evidence

Mechanistically, folate is involved in DNA methylation and synthesis — making it plausibly both protective AND a growth-promoter for cancer depending on timing and dose. Observational studies suggest higher dietary folate intake correlates with lower colorectal cancer risk. Trials of high-dose folic acid in patients with prior colorectal adenoma have, however, shown a slight INCREASE in subsequent adenoma counts in some studies. Net: don't take high-dose folic acid for cancer prevention; food folate from vegetables and legumes is the safe, evidence-aligned choice.

Effect size

Mixed; possible small benefit at dietary levels, possible small harm at high supplemental doses

Time to effect

Not established

Best fit

Nobody — get folate from food, not high-dose supplements, for cancer-related reasons

Less likely

Anyone taking high-dose folic acid hoping to lower cancer risk

Bottom line: Don't take folic acid to prevent cancer. Eat leafy greens and legumes instead — that's what the protective observational data point to.

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet Bailey et al., 2010 — American Journal of Clinical Nutrition (PMC)

How it works

B9 is a cofactor in one-carbon metabolism, which provides the methyl groups needed to build DNA and the bases that form it. It is critical during rapid cell division, which is why deficiency causes megaloblastic anemia (large, immature red blood cells) and increases the risk of neural tube defects in early pregnancy. All B9 forms are eventually converted to 5-methyltetrahydrofolate, the active circulating form. The body uses methyl-folate alongside vitamin B12 to convert homocysteine to methionine, supporting methylation reactions throughout the body.

How to take it

1. Typical dose

• 400 mcg DFE/day for non-pregnant adults (RDA) • 600 mcg DFE/day during pregnancy • 500 mcg DFE/day while breastfeeding • 4,000 mcg/day (4 mg) for women with a prior NTD-affected pregnancy, starting 1 month pre-conception (prescription-managed)

2. Higher studied dose

Up to 5 mg/day folic acid is used short-term for folate-deficiency anemia under medical supervision. Routine intake of synthetic folic acid above 1,000 mcg/day is not recommended without monitoring B12.

3. Timing

Take any time of day. Folate's metabolic role isn't tied to a circadian rhythm. Pairing with a meal is fine but not required.

4. With food

With or without food — both work.

5. Split dosing

Once-daily dosing is fine at standard doses. Higher therapeutic doses (4-5 mg) are sometimes split, but the body absorbs folic acid well in a single dose.

6. How long to try

Indefinite if you could become pregnant — keep taking through the first trimester of pregnancy. For anemia correction, 4-8 weeks to normalize labs, then reassess.

What to track

Pregnancy planning — start 1+ month before trying to conceive

Vitamin B12 status (especially if dose >1,000 mcg/day for >1 month)

Macrocytic anemia labs (MCV, hemoglobin) if treating deficiency

Homocysteine if you have documented hyperhomocysteinemia

Bottom line: If pregnancy is a possibility, take 400-800 mcg folic acid every day, period. Otherwise food (leafy greens, legumes, fortified grains) covers most adults.

4 commercial forms

Compare the main delivery options and what they’re best suited for.

Folic acid (pteroylmonoglutamic acid)

Most studied

The synthetic form used in supplements, prenatal vitamins, and U.S./Canada food fortification. Highly stable, very well absorbed (~85%), and the form used in essentially every neural-tube-defect prevention RCT. The form to use for pregnancy planning unless you have a specific reason to choose otherwise.

Bioavailability ~85% in fortified foods, ~100% on an empty stomach.

Folate (natural, food-derived)

From food

Naturally occurring polyglutamated folates in leafy greens, legumes, citrus, and liver. Lower bioavailability than folic acid (~50%) because the polyglutamate tail has to be cleaved before absorption. No tolerable upper limit applies to dietary folate.

~50% bioavailability vs folic acid.

5-MTHF / L-methylfolate (Metafolin, Quatrefolic)

Active form

The biologically active form that circulates after the body processes folate or folic acid. Bypasses the MTHFR enzyme step — relevant for MTHFR variant carriers and for patients on SSRIs where methylfolate-augmentation is being tried. Has its own dedicated page on this site with the deeper evidence breakdown.

Comparable to folic acid; bypasses MTHFR reductase step.

Folinic acid (leucovorin / 5-formyl-tetrahydrofolate)

Prescription-context

Prescription folate metabolite used in oncology (methotrexate rescue, pyrimethamine combination) and inborn errors of folate metabolism. Not a routine supplement choice.

Used parenterally or orally in clinical settings.

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

nausea (uncommon)bloating (uncommon)sleep changes (uncommon at high doses)

Serious risks

Folic acid can correct the macrocytic anemia of B12 deficiency while letting the underlying neurological damage (peripheral neuropathy, dementia) progress unchecked. Always confirm B12 status before taking folic acid >1,000 mcg/day long-term.
SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet
High-dose folic acid (>1,000 mcg/day) leads to circulating unmetabolized folic acid, whose long-term effects are debated; potential cancer-promotion in people with pre-existing adenomas is the most-discussed theoretical concern.
SourceBailey et al., 2010 — American Journal of Clinical Nutrition (PMC)NIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet

Who should avoid it

People with untreated vitamin B12 deficiency — fix B12 first or treat both together. Folic acid alone can mask B12 deficiency on blood tests.
SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet
People with active cancer or recent precancerous lesions (e.g. colorectal adenomas) should discuss high-dose folic acid with their oncologist — evidence is mixed but cautious.
SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet
Anyone taking methotrexate for cancer chemotherapy (NOT for autoimmune disease) — folic acid can reduce methotrexate's antitumor effect. Methotrexate at autoimmune doses is normally paired WITH folic acid to reduce side effects; this is the opposite case.
SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet

Pregnancy & breastfeeding

Strongly recommended. RDA in pregnancy is 600 mcg DFE/day; USPSTF recommends 400-800 mcg/day folic acid for anyone planning or capable of pregnancy. Women with a prior NTD-affected pregnancy take 4,000 mcg (4 mg) under medical supervision. Breastfeeding RDA is 500 mcg DFE/day.

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet US Preventive Services Task Force, 2023 — JAMA — USPSTF Recommendation Statement

Bottom line: Generally very safe at recommended doses. The big rule: always confirm B12 status before going above 1,000 mcg/day long-term.

Interactions

methotrexate (oncology doses)Major

Folic acid reduces methotrexate's antitumor effect in cancer chemotherapy. Different scenario from low-dose methotrexate for rheumatoid arthritis or psoriasis, where folic acid is co-prescribed to reduce side effects.

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet

anti-epileptic drugs (phenytoin, fosphenytoin, carbamazepine, valproate, phenobarbital)Moderate

These drugs lower serum folate. Reciprocally, high-dose folic acid can lower phenytoin levels and worsen seizure control. Supplement only with the prescribing neurologist's input.

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet

sulfasalazineModerate

Inhibits intestinal folate absorption and is a competitive folate antagonist. Patients on long-term sulfasalazine typically benefit from folic acid supplementation, but check with the prescriber.

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet

trimethoprim / trimethoprim-sulfamethoxazole (long-term)Moderate

Trimethoprim is a weak inhibitor of human dihydrofolate reductase. Long courses (>2 weeks) can deplete folate, especially in pregnancy.

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet

pyrimethamineModerate

Folate antagonist used for toxoplasmosis; routinely co-prescribed with folinic acid (leucovorin), not folic acid.

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet

alcohol (chronic heavy use)Moderate

Chronic alcohol reduces folate absorption and accelerates urinary loss; heavy drinkers are at high risk of folate deficiency. Reasonable indication for supplementation.

SourceNIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet

Food sources

Food	Amount	%DV
Beef liver, braised	3 oz (215 mcg DFE)	54%
Spinach, boiled	½ cup (131 mcg DFE)	33%
Black-eyed peas, boiled	½ cup (105 mcg DFE)	26%
Breakfast cereal, fortified	1 serving (100-400 mcg DFE)	25%
Asparagus, boiled	4 spears (89 mcg DFE)	22%
White rice, enriched, cooked	½ cup (90 mcg DFE)	23%
Brussels sprouts, frozen, boiled	½ cup (78 mcg DFE)	20%
Romaine lettuce, shredded	1 cup (64 mcg DFE)	16%
Avocado, sliced	½ cup (59 mcg DFE)	15%
Spaghetti, enriched, cooked	½ cup (83 mcg DFE)	21%
Broccoli, chopped, boiled	½ cup (52 mcg DFE)	13%
Mustard greens, chopped, boiled	½ cup (52 mcg DFE)	13%
Green peas, frozen, boiled	½ cup (47 mcg DFE)	12%
Kidney beans, canned	½ cup (46 mcg DFE)	12%
Wheat germ	2 Tbsp (40 mcg DFE)	10%
Orange juice, fresh	¾ cup (35 mcg DFE)	9%
Egg, hard-boiled	1 large (22 mcg DFE)	6%

Beef liver, braised

Amount: 3 oz (215 mcg DFE)
%DV: 54%

Spinach, boiled

Amount: ½ cup (131 mcg DFE)
%DV: 33%

Black-eyed peas, boiled

Amount: ½ cup (105 mcg DFE)
%DV: 26%

Breakfast cereal, fortified

Amount: 1 serving (100-400 mcg DFE)
%DV: 25%

Asparagus, boiled

Amount: 4 spears (89 mcg DFE)
%DV: 22%

White rice, enriched, cooked

Amount: ½ cup (90 mcg DFE)
%DV: 23%

Brussels sprouts, frozen, boiled

Amount: ½ cup (78 mcg DFE)
%DV: 20%

Romaine lettuce, shredded

Amount: 1 cup (64 mcg DFE)
%DV: 16%

Avocado, sliced

Amount: ½ cup (59 mcg DFE)
%DV: 15%

Spaghetti, enriched, cooked

Amount: ½ cup (83 mcg DFE)
%DV: 21%

Broccoli, chopped, boiled

Amount: ½ cup (52 mcg DFE)
%DV: 13%

Mustard greens, chopped, boiled

Amount: ½ cup (52 mcg DFE)
%DV: 13%

Green peas, frozen, boiled

Amount: ½ cup (47 mcg DFE)
%DV: 12%

Kidney beans, canned

Amount: ½ cup (46 mcg DFE)
%DV: 12%

Wheat germ

Amount: 2 Tbsp (40 mcg DFE)
%DV: 10%

Orange juice, fresh

Amount: ¾ cup (35 mcg DFE)
%DV: 9%

Egg, hard-boiled

Amount: 1 large (22 mcg DFE)
%DV: 6%

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

DFE (Dietary Folate Equivalents) on the label — 1 mcg folic acid = 1.7 mcg DFE; this matters for matching the RDA correctly

400 mcg folic acid (= 680 mcg DFE) is the standard pregnancy-prep dose

Third-party tested (USP, NSF, ConsumerLab)

If you have an MTHFR variant or your prescriber recommends methylfolate, look for the dedicated 5-MTHF product (separate page)

Standalone folic acid or a prenatal multivitamin both work — choose based on what other nutrients you also need

Be skeptical of…

'Boosts heart health' or 'lowers heart attack risk' — large RCTs disproved this despite the homocysteine effect

'Mood support' for folic acid alone — methylfolate has a small evidence base, plain folic acid does not

High-dose (5-10 mg) folic acid as a daily wellness product — risks masking B12 deficiency

'Methylated B-complex' marketing implying everyone needs methylated forms — only relevant for MTHFR variant carriers, and even then routine genotyping isn't recommended

Combination products that hide the actual folic-acid vs folate dose behind 'folate blend'

Frequently asked questions

What is the difference between folate and folic acid?⌄

Folate is the natural form in food. Folic acid is the synthetic form used in supplements and fortified foods. Both are converted to active 5-MTHF in the body.

When should I start taking folic acid for pregnancy?⌄

At least one month before conception. The neural tube closes very early — often before a woman knows she is pregnant — so folate must already be adequate.

Is methylfolate worth the extra cost?⌄

For most people, folic acid works fine. Methylfolate may be preferable for those with MTHFR variants or who prefer to avoid unmetabolized folic acid.

Can too much folic acid be harmful?⌄

High doses can mask B12 deficiency, allowing nerve damage to progress undetected. The upper limit from supplements and fortified foods is 1,000 mcg per day.

Does folic acid affect cancer risk?⌄

The data is mixed. Adequate intake supports DNA stability, but very high doses have been associated with increased cancer growth in people with pre-existing lesions. Stick to the RDA unless your doctor advises otherwise.

References by claim

Megaloblastic anemia correction

NIH Office of Dietary Supplements — Folate — Health Professional Fact Sheet (2024) link

Neural tube defect prevention

US Preventive Services Task Force, 2023 — JAMA — USPSTF Recommendation Statement (2023) link

MRC Vitamin Study Research Group, 1991 — The Lancet (1991) link

Czeizel & Dudas, 1992 — New England Journal of Medicine (1992) link

De-Regil et al., 2015 — Cochrane Database of Systematic Reviews (2015) link

Cancer prevention vs promotion

Bailey et al., 2010 — American Journal of Clinical Nutrition (PMC) (2010) link

Other references

Liew & Gupta, 2021 — European Journal of Medical Genetics (PMC) (2021) link

CDC, MMWR — CDC — Neural Tube Defects Surveillance after Folic-Acid Fortification (2015) link

U.S. FDA — FDA — Folic Acid Fortification Final Rule (2016) link

NIH Office of Dietary Supplements (Consumer) — Folate — Consumer Fact Sheet (2024) link

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Evidence-based·Last reviewed May 31, 2026·Evidence current as of May 31, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.