Folate (5-MTHF): Dosage, Timing & Interactions

Check it against something

Evidence level A

Folate (5-MTHF) with:

99 out of 100

Works better together Take together — same timing window amplifies the synergy.

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What it does

mechanism and evidence for each claim

Neural tube defect prevention

Reduces risk of spina bifida and anencephaly by 50-70%

Essential for neural tube closure during early pregnancy Evidence A-grade Must be adequate before conception

DNA synthesis and repair

Essential for proper cell division and DNA integrity

Provides one-carbon units for nucleotide synthesis Evidence A-grade Ongoing cellular process

Red blood cell formation

Prevents megaloblastic anemia

Required for DNA synthesis in rapidly dividing cells Evidence A-grade 4-8 weeks

Cardiovascular health

Helps maintain healthy homocysteine levels

Remethylation of homocysteine to methionine Evidence A-grade 4-8 weeks

Mood and cognitive support

May improve depression and cognitive function

Methylation of neurotransmitters and DNA repair Evidence B-grade 4-12 weeks

Or a different form of the same thing

the comparison people search most

Folate (5-MTHF) vs Vitamin B9 (Folic Acid) absorption 95 against 85 · $20 against $5 a month 85% Folate (5-MTHF) vs Vitamin B9 (Folinic Acid) absorption 95 against 98 · $20 against $100 a month 98%

All Folate forms ranked by absorption →

Every pair we checked

12 combinations scored by the engine

Folate (5-MTHF) + Caffeine No documented interaction either way No known interaction 70

Folate (5-MTHF) + Creatine Monohydrate No documented interaction either way No known interaction 70

Folate (5-MTHF) + Whey Protein No documented interaction either way No known interaction 70

Folate (5-MTHF) + Turmeric No documented interaction either way No known interaction 70

Folate (5-MTHF) + Zinc Gluconate Zinc deficiency impairs folate utilization Needs attention 76

Folate (5-MTHF) + Lactase Improved calcium absorption when consuming dairy Works better together 82

Folate (5-MTHF) + Bovine Collagen Essential for collagen synthesis and cross-linking Works better together 82

Folate (5-MTHF) + DHA Prevents oxidation of DHA and enhances stability Works better together 82

Folate (5-MTHF) + Calcium Carbonate Essential for calcium absorption and utilization Works better together 94

Folate (5-MTHF) + Vitamin D3 Work together in methylation and DNA synthesis Works better together 99

Folate (5-MTHF) + Vitamin C (Ascorbic Acid) Work together in methylation and DNA synthesis Works better together 99

Folate (5-MTHF) + Vitamin B12 (Methylcobalamin) Work together in methylation and DNA synthesis Works better together 99

Dosage

Morning with food

Daily400-800 mcg

Maintenance400-600 mcg

Therapeutic800-1000 mcg

Maximum1000 mcg (tolerable upper limit for folic acid)

Pregnancy600-800 mcg

Upper limit 1000 mcg NIH ODS

Before you take it

Pregnancyrecommended

VeganYes

When to expect it

First Effects2-4 weeks for cellular processes

Peak Benefits8-12 weeks for cardiovascular and mood benefits

Deficiency Development4-12 weeks with inadequate intake

Toxicity OnsetNo known toxicity from natural folates

How to measure it

$40-80

MarkerSerum folate and RBC folate

OptimalSerum: >7 ng/mL, RBC: >140 ng/mL

Deficient belowSerum: <3 ng/mL, RBC: <140 ng/mL

FrequencyAnnually for pregnant women, as needed for others

What people actually reported to the FDA

CAERS, 14 reports naming it as the suspect

Most reported effects

Fatigue 3

Nausea 3

Palpitations 2

Pruritus 2

Hypersensitivity 2

Named as the suspect 14 reports of 44 that mention it at all

Serious outcome 81% hospitalisation, emergency room or worse

Other Serious or Important Medical Event6

Disability5

Other Serious Outcome4

Reports are voluntary and unverified — they record what someone experienced while taking something, not what the compound caused. Counts skew towards products people take a lot of, and a serious outcome is more likely to be reported than a mild one, so these are not rates. How we filter them →

What actually reaches you

The label counts the carrier, your body does not

Absorption Very high 95 of 100 · best absorbed form of this compound

Delivered daily 0.6 mg

Cost per 10 mg delivered $11.70 comparative — uses the absorption score, not a measured percentage

Works better with

3 documented

+

Vitamin B12

Work together in methylation and DNA synthesis

Complementary roles in one-carbon metabolism · level A

+

Vitamin B6

Both involved in homocysteine metabolism

Sequential steps in methylation pathway · level A

+

Vitamin C

Protects folate from oxidation

Antioxidant protection and folate regeneration · level B

What not to take with Folate (5-MTHF)

2 documented

!

Alcohol

Significantly impairs folate absorption and metabolism

Interferes with folate transport and metabolism · major significance

!

Zinc Deficiency

Zinc deficiency impairs folate utilization

Zinc required for folate-dependent enzymes · moderate significance

Medication interactions

Discuss these with a pharmacist before combining

methotrexate Major

May reduce methotrexate effectiveness

What to do: Avoid folate supplements during treatment

anticonvulsants Moderate

Some anticonvulsants deplete folate

What to do: Monitor folate status, consider supplementation

sulfasalazine Moderate

Reduces folate absorption

What to do: Supplement with folate during treatment

Available forms

bioavailability compared

Ranks 2 of 3 among folate forms. Vitamin B9 (Folinic Acid) absorbs better — 98%. Compare all forms →

5-Methyltetrahydrofolate (5-MTHF) 95

Folinic Acid (Leucovorin) 85

Folic Acid 85

5-Methyltetrahydrofolate (5-MTHF): Active form, Bypasses MTHFR, Best for gene variants

Folinic Acid (Leucovorin): Active form, Stable, Medical grade

Folic Acid: Least expensive, Most stable, Most research

Food sources

before you supplement

Chicken liver 588 mcg/100g · 80

Spinach (cooked) 194 mcg/100g · 70

Asparagus 149 mcg/100g · 75

Brussels sprouts 61 mcg/100g · 70

Avocado 20 mcg/100g · 65

Too little

deficiency signs

Megaloblastic anemia
Fatigue and weakness
Irritability and depression
Poor memory and concentration
Glossitis (smooth, red tongue)
Neural tube defects in pregnancy
Elevated homocysteine levels

Too much

toxicity signs

No known toxicity from natural folates
Unmetabolized folic acid may cause issues
May mask B12 deficiency
Possible immune system effects (theoretical)
Upper limit applies only to synthetic folic acid

Who benefits most

pregnant-women

Critical for preventing neural tube defects

600-800 mcg daily

women-of-childbearing-age

Neural tube forms before pregnancy is often known

400-600 mcg daily

mthfr-gene-variants

Impaired ability to convert folic acid to active form

400-1000 mcg methylfolate daily

elderly

Reduced absorption and increased requirements

400-800 mcg daily

heavy-drinkers

Alcohol significantly depletes folate

600-1000 mcg daily

Where to buy it

compare forms first

Look for Folate (5-MTHF) at 400-800 mcg per serving. The form that matters here is 5-Methyltetrahydrofolate (5-MTHF).

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What else affects it

Beyond other supplements

!

Alcohol

Significantly impairs folate absorption and metabolism

Interferes with folate transport and metabolism

How it works

Provides one-carbon units for DNA and RNA synthesis
Essential for methylation reactions throughout the body
Required for amino acid metabolism (methionine cycle)
Critical for purine and thymidine synthesis
Supports red blood cell maturation
Required for neurotransmitter synthesis

Key findings

what the evidence supports

Prevents 50-70% of neural tube defects (NEJM 1992)
Essential for DNA synthesis - established biochemistry
Reduces homocysteine levels significantly (Cochrane 2015)
May improve depression in deficient individuals (AJCN 2012)

Sources: NIH Examine.com · data reviewed 2026-08-02

Compiled by Denis, who maintains this database and holds no medical qualification — every figure here is sourced or derived, never asserted. How we calculate it →

Common questions

What are the benefits of Folate (5-MTHF)?

Documented effects: Neural tube defect prevention; DNA synthesis and repair; Red blood cell formation; Cardiovascular health. Reduces risk of spina bifida and anencephaly by 50-70%

How much Folate (5-MTHF) should you take per day?

The common daily range is 400-800 mcg. By goal — maintenance: 400-600 mcg; therapeutic: 800-1000 mcg; maximum: 1000 mcg (tolerable upper limit for folic acid); pregnancy: 600-800 mcg.

When is the best time to take Folate (5-MTHF)?

Morning with food. First effects are typically reported within 2-4 weeks for cellular processes.

What are the side effects of Folate (5-MTHF)?

At excessive doses: No known toxicity from natural folates, Unmetabolized folic acid may cause issues, May mask B12 deficiency, Possible immune system effects (theoretical), Upper limit applies only to synthetic folic acid. Safety rating at normal doses is 9 out of 10.

What should you not take with Folate (5-MTHF)?

Separate it from Alcohol, Zinc Deficiency by two to four hours. Significantly impairs folate absorption and metabolism

Does Folate (5-MTHF) interact with medications?

Documented interactions with methotrexate, anticonvulsants, sulfasalazine. Discuss these with a pharmacist before combining.

How much Folate (5-MTHF) is too much?

The tolerable upper intake level is 1000 mcg per day for adults, per NIH ODS. Above that, the risk of adverse effects rises: No known toxicity from natural folates, Unmetabolized folic acid may cause issues, May mask B12 deficiency.

How do you know if you need Folate (5-MTHF)?

The marker is Serum folate and RBC folate, optimal range Serum: >7 ng/mL, RBC: >140 ng/mL. Common deficiency signs: Megaloblastic anemia, Fatigue and weakness, Irritability and depression, Poor memory and concentration.