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5-MTHF

Supporting methylation, mood, and cardiovascular health, especially in those with MTHFR variations.

Evidence · Grade BSafety · Generally safe
Human trial evidenceTraditional useInteraction risk

5-MTHF (L-methylfolate) is the active form of folate, essential for DNA synthesis, red blood cell production, and neurotransmitter synthesis, particularly beneficial for those with impaired folate metabolism.

5-MTHF, or L-methylfolate, is the biologically active form of folate (Vitamin B9). Unlike folic acid, which requires enzymatic conversion in the body, 5-MTHF can be directly utilized. This makes it particularly relevant for individuals with genetic variations (like MTHFR polymorphisms) that impair the conversion of folic acid to its active form. Folate is essential for numerous bodily functions, including DNA synthesis and repair, red blood cell production, and the metabolism of homocysteine. Adequate folate levels are crucial for neurological health, mood regulation, and cardiovascular function. Supplementation with 5-MTHF aims to ensure sufficient active folate for these vital processes, especially when dietary intake or metabolic conversion of other folate forms is insufficient. Research into 5-MTHF explores its potential benefits in conditions associated with folate deficiency or impaired folate metabolism, such as certain mood disorders, cardiovascular issues, and during pregnancy.

Quick answer

What it is: 5-MTHF, or L-methylfolate, is the biologically active form of folate (Vitamin B9).

May support:Anxiety, Folate Deficiency, Depression

Evidence:Evidence · Grade B

Safety:Safety · Generally safe

Evidence Summary

Evidence · Grade B

There is substantial evidence supporting the role of folate in various physiological processes and the benefits of 5-MTHF, particularly for individuals with MTHFR polymorphisms or conditions associated with impaired folate metabolism. Studies have shown its efficacy in improving folate status, reducing homocysteine levels, and as an adjunctive treatment for certain mood disorders. The direct bioavailability of 5-MTHF compared to folic acid is well-established.

Last reviewed · Jun 2026

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Why It Works

5-MTHF directly provides the active form of folate, bypassing the need for enzymatic conversion. It acts as a methyl donor in the methylation cycle, which is critical for neurotransmitter synthesis, DNA repair, and homocysteine metabolism.

How it works in more detail

5-MTHF (L-methylfolate) is the primary circulating form of folate and the only form that can cross the blood-brain barrier. It is a coenzyme in the one-carbon metabolism pathway, specifically as a methyl donor in the methylation cycle. This cycle is crucial for converting homocysteine to methionine, a precursor to S-adenosylmethionine (SAMe), which is involved in numerous methylation reactions throughout the body. These reactions are vital for the synthesis of neurotransmitters like serotonin, dopamine, and norepinephrine, as well as for DNA and RNA synthesis, gene expression, and detoxification processes. By providing readily available active folate, 5-MTHF helps maintain optimal methylation, supports neurological function, and aids in reducing elevated homocysteine levels, which are associated with cardiovascular risk.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
Common consumer dosages range from 400 mcg to 1 mg daily, often taken as a capsule or tablet, preferably with food.
Research dosage range
200 mcg to 15 mg daily, depending on the condition being studied and individual needs.
Typical onset
Effects may be noticed within days to weeks, particularly for mood support or homocysteine reduction, but can vary by individual.
Typical forms
capsule, tablet
Quality markers
Look for products that specify the form of L-methylfolate (e.g., Metafolin®, Quatrefolic®) for better bioavailability and stability. Third-party testing for purity and potency is also beneficial.
Medication interactions
  • Anticonvulsants
  • Methotrexate
  • Pyrimethamine
  • Sulfasalazine
Avoid if
  • Undiagnosed Vitamin B12 deficiency (without co-supplementation)
  • Known allergy to folate
Pregnancy / lactation
Folate is crucial during pregnancy to prevent neural tube defects. 5-MTHF is often recommended, especially for those with MTHFR variations. However, any supplementation during pregnancy or lactation should be done under the guidance of a healthcare professional.

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Suggested dosage

Common consumer dosages range from 400 mcg to 1 mg daily, often taken as a capsule or tablet, preferably with food.

General guidance — discuss specifics with a clinician.

Active medicinal compounds

L-methylfolate

Traditional use

Not applicable; 5-MTHF is a modern pharmaceutical/nutraceutical compound.

Safety

Safety warnings

5-MTHF is generally considered safe for most adults when taken at appropriate doses. High doses may mask a Vitamin B12 deficiency, potentially leading to neurological damage if the B12 deficiency is left untreated. Individuals with bipolar disorder should use 5-MTHF with caution, as it may exacerbate manic symptoms in some cases. Always consult a healthcare provider before starting supplementation, especially if you have pre-existing health conditions or are taking other medications.

Avoid if

  • Undiagnosed Vitamin B12 deficiency (without co-supplementation)
  • Known allergy to folate

Medication interactions

  • Anticonvulsants
  • Methotrexate
  • Pyrimethamine
  • Sulfasalazine

Reported side effects

  • Nausea
  • Bloating
  • Insomnia
  • Irritability
  • Headache

Pregnancy & lactation

Folate is crucial during pregnancy to prevent neural tube defects. 5-MTHF is often recommended, especially for those with MTHFR variations. However, any supplementation during pregnancy or lactation should be done under the guidance of a healthcare professional.

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

Overall grade (B)

There is substantial evidence supporting the role of folate in various physiological processes and the benefits of 5-MTHF, particularly for individuals with MTHFR polymorphisms or conditions associated with impaired folate metabolism. Studies have shown its efficacy in improving folate status, reducing homocysteine levels, and as an adjunctive treatment for certain mood disorders. The direct bioavailability of 5-MTHF compared to folic acid is well-established.

Observational Studies(1)

Cohort, case-control, and cross-sectional human studies.

Moderate Quality

  • Folic acid versus 5- methyl tetrahydrofolate supplementation in pregnancy.

    Ferrazzi E, Tiso G, Di Martino D · European journal of obstetrics, gynecology, and reproductive biology · 2020

    Folate (vitamin B9) is widely accepted to protect against fetal neural tube defects. The main sources of dietary folate are folic acid-fortified foods and folic acid-containing dietary supplements. However, folic acid is inactive in the human body and must be converted by the liver into the active molecule 5-methyltetrahydrofolate (5-MTHF). 5-MTHF functions as a methyl donor in many metabolic reactions, including the conversion of homocysteine into methionine, the biosynthesis of glycine from serine, and the biosynthesis of DNA precursor molecules. Therefore, folate is fundamental for growth, especially in the embryonic and fetal stages. Prescription of folic acid to women in the preconception period and during pregnancy is a consolidated practice. However, it can pose health risks in certain conditions, such as megaloblastic anemia, where it will conceal megaloblastic anemia due to vitamin B12 deficiency and in cases of reduced hepatic transformation of folic acid (e.g. due to genetic

    Observational StudyPubMedLow Quality

Limitations: While promising, more large-scale, long-term clinical trials are needed to fully elucidate the efficacy and optimal dosing of 5-MTHF for all proposed applications. Research on specific conditions often involves heterogeneous populations and varying methodologies, making direct comparisons challenging. The exact mechanisms and individual responses can also vary significantly.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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