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L-5-methyltetrahydrofolate (L-5-MTHF) 1,000 mcg per capsule the biologically active form of folate (vitamin B9) that circulates in the bloodstream and crosses the blood-brain barrier. Unlike folic acid, which requires a multi-step enzymatic conversion to become metabolically active, L-5-MTHF is ready for immediate use in folate-dependent pathways including red blood cell formation, homocysteine metabolism, DNA synthesis, and energy metabolism. 

L-5-MTHF vs. Folic Acid

Folic acid is the synthetic, oxidized form of folate used in most supplements and fortified foods. To become metabolically active, folic acid must be reduced and methylated through a series of enzymatic steps ultimately to L-5-MTHF by enzymes including dihydrofolate reductase (DHFR) and methylenetetrahydrofolate reductase (MTHFR). This conversion is rate limited and can be impaired by common genetic variants in the MTHFR gene (particularly C677T and A1298C), which reduce MTHFR enzyme activity and the efficiency of folic acid conversion.

L-5-MTHF bypasses this conversion entirely. As the end product of the folate metabolic pathway, it enters folate-dependent reactions directly supporting red blood cell formation, homocysteine remethylation to methionine, purine and pyrimidine synthesis for DNA replication, and one-carbon metabolism without requiring MTHFR activity.

Methyl Folate 1000mcg (L-5-MTHF) | Active Folate | Red Blood Cell & Homocysteine Support

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Health Canada Licensed Natural Health Product (NPN 80138114)

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L-5-methyltetrahydrofolate (L-5-MTHF) 1,000 mcg per capsule the biologically active form of folate (vitamin B9) that circulates in the bloodstream and crosses the blood-brain barrier. Unlike folic acid, which requires a multi-step enzymatic conversion to become metabolically active, L-5-MTHF is ready for immediate use in folate-dependent pathways including red blood cell formation, homocysteine metabolism, DNA synthesis, and energy metabolism. 

L-5-MTHF vs. Folic Acid

Folic acid is the synthetic, oxidized form of folate used in most supplements and fortified foods. To become metabolically active, folic acid must be reduced and methylated through a series of enzymatic steps ultimately to L-5-MTHF by enzymes including dihydrofolate reductase (DHFR) and methylenetetrahydrofolate reductase (MTHFR). This conversion is rate limited and can be impaired by common genetic variants in the MTHFR gene (particularly C677T and A1298C), which reduce MTHFR enzyme activity and the efficiency of folic acid conversion.

L-5-MTHF bypasses this conversion entirely. As the end product of the folate metabolic pathway, it enters folate-dependent reactions directly supporting red blood cell formation, homocysteine remethylation to methionine, purine and pyrimidine synthesis for DNA replication, and one-carbon metabolism without requiring MTHFR activity.

Supplement Facts

Supplement Facts

Serving Size: 1 Capsule

Servings Per Container: 90

Ingredient
Amount Per
Serving
% Daily
Value
Folate (L-5-Methyltetrahydrofolate, calcium salt)
1,000 mcg DFE

† Daily Value not established

Other Ingredients:
Hypromellose (Vegetable Capsule Shell), Microcrystalline Cellulose, Magnesium Stearate

Clinical Research

L-5-methyltetrahydrofolate versus folic acid: bioavailability and efficacy in folate deficient subjects

European Journal of Clinical Nutrition, 2004

This randomized controlled trial compared the bioavailability and efficacy of L-5-MTHF and folic acid in adults with low folate status. The study found that L-5-MTHF was at least as effective as folic acid in raising blood folate levels and significantly more effective in individuals with reduced MTHFR enzyme activity. The authors concluded that L-5-MTHF is a superior supplemental form of folate for individuals with impaired folic acid conversion capacity

Folate and homocysteine metabolism: clinical implications

American Journal of Clinical Nutrition, 1999

This comprehensive review examined the biochemical relationship between folate, L-5-MTHF, and homocysteine metabolism. The review established that L-5-MTHF provides the methyl groups required to convert homocysteine to methionine via methionine synthase, and that adequate folate status is essential for maintaining healthy homocysteine levels. The authors confirmed that L-5-MTHF is the active folate form directly involved in the methylation cycle.

MTHFR gene variants and folate metabolism: implications for supplementation

Nutrients, 2017

This review examined the clinical implications of common MTHFR gene variants (C677T and A1298C) on folate metabolism and supplementation strategy. The review found that individuals with reduced MTHFR enzyme activity have impaired conversion of folic acid to L-5-MTHF, and that direct supplementation with L-5-MTHF bypasses this enzymatic step. The authors concluded that L-5-MTHF is the preferred supplemental form of folate for individuals with MTHFR variants.

Research information is provided for educational purposes and does not replace the product's approved label information.

Frequently Asked Questions

What is methyl folate (L-5-MTHF) and what is it used for?

Methyl folate (L-5-methyltetrahydrofolate, or L-5-MTHF) is the biologically active form of folate (vitamin B9) found in the bloodstream and the form that crosses the blood brain barrier. Unlike folic acid, L-5-MTHF does not require enzymatic conversion and is ready for immediate use by the body. It supports red blood cell formation, homocysteine metabolism, energy metabolism, and DNA synthesis.

What is the difference between methyl folate and folic acid?

Folic acid is the synthetic form of folate used in most supplements and fortified foods. It must be converted by the body into L-5-MTHF through a series of enzymatic steps involving the MTHFR enzyme. L-5-MTHF is the active, methylated form that the body uses directly no conversion required. For individuals with reduced MTHFR enzyme activity, L-5-MTHF bypasses the conversion step that may be impaired.

What is the MTHFR gene and why does it matter for folate?

MTHFR (methylenetetrahydrofolate reductase) is the enzyme responsible for converting folic acid into the active form L-5-MTHF. Common genetic variations in the MTHFR gene (C677T and A1298C) reduce this enzyme's activity, impairing the conversion of folic acid to the usable form. Supplementing with L-5-MTHF directly bypasses this conversion step, providing active folate regardless of MTHFR genotype.

Does methyl folate support homocysteine metabolism?

Yes. Folate specifically L-5-MTHF provides the methyl groups needed to convert homocysteine to methionine via the methylation cycle. This is a key step in maintaining healthy homocysteine levels. Folate works alongside vitamins B6 and B12 in this pathway. Consult a healthcare practitioner for advice specific to your homocysteine levels.

Is methyl folate safe during pregnancy?

Folate is essential during pregnancy for normal fetal neural tube development. Consult a healthcare practitioner before use if you are pregnant or breastfeeding to determine the appropriate form and dose of folate for your individual needs. Do not self select a high dose folate supplement during pregnancy without professional guidance.

Who should consider taking methyl folate instead of folic acid?

L-5-MTHF is particularly relevant for individuals with known or suspected MTHFR gene variations, those who have not responded well to folic acid supplementation, individuals seeking a highly bioavailable form of folate, and those following a methylated B vitamin protocol. Consult a healthcare practitioner to determine whether L-5-MTHF is appropriate for your individual situation.