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Folic Acid (5-Methylfolate)
5-Methyltetrahydrofolate (5-MTHF)
The bioactive, methylated form of folate (Vitamin B9) — directly usable by the body without conversion. Essential for DNA synthesis, cardiovascular health, neurotransmitter production, and fetal development. Superior to standard folic acid for individuals with the MTHFR genetic variant.
What Is It?
5-Methylfolate (5-MTHF) is the naturally occurring, active form of folate found in food and in the bloodstream. Unlike synthetic folic acid — which requires conversion by the enzyme MTHFR before the body can use it — 5-MTHF is immediately bioavailable.
This distinction is critically important because an estimated 40-60% of the population carries a variant of the MTHFR gene that reduces their ability to convert folic acid — making 5-MTHF the recommended form for supplementation.
This distinction is critically important because an estimated 40-60% of the population carries a variant of the MTHFR gene that reduces their ability to convert folic acid — making 5-MTHF the recommended form for supplementation.
How It Works
5-Methylfolate is essential for the methylation cycle — one of the body's most fundamental biochemical processes. Methylation affects DNA repair, gene expression, neurotransmitter synthesis, and detoxification.
Key functions include:
- Homocysteine conversion — converts homocysteine to methionine, reducing cardiovascular risk
- DNA synthesis and repair — essential for cell division and genetic integrity
- Neurotransmitter production — supports serotonin, dopamine, and norepinephrine synthesis
- Myelin formation — supports the protective sheath around nerve fibers
- Fetal neural tube development — critical during early pregnancy
Key functions include:
- Homocysteine conversion — converts homocysteine to methionine, reducing cardiovascular risk
- DNA synthesis and repair — essential for cell division and genetic integrity
- Neurotransmitter production — supports serotonin, dopamine, and norepinephrine synthesis
- Myelin formation — supports the protective sheath around nerve fibers
- Fetal neural tube development — critical during early pregnancy
Side Effects & Considerations
5-Methylfolate is extremely safe and well tolerated:
- No established tolerable upper limit — toxicity is extremely rare
- May unmask Vitamin B12 deficiency symptoms if B12 is very low — ensure adequate B12 intake
- Those on methotrexate (cancer/autoimmune drug) should not supplement folate without medical supervision
- Very safe during pregnancy — in fact critically important for neural tube development
- May cause mild digestive effects in very sensitive individuals
- Drug interactions with certain seizure medications — consult healthcare provider
- No established tolerable upper limit — toxicity is extremely rare
- May unmask Vitamin B12 deficiency symptoms if B12 is very low — ensure adequate B12 intake
- Those on methotrexate (cancer/autoimmune drug) should not supplement folate without medical supervision
- Very safe during pregnancy — in fact critically important for neural tube development
- May cause mild digestive effects in very sensitive individuals
- Drug interactions with certain seizure medications — consult healthcare provider
Typical Dosage Range
400mcg – 1,000mcg daily
The RDA for folate is 400mcg for adults and 600mcg during pregnancy. Therapeutic doses of 1,000-15,000mcg are used clinically for depression and homocysteine reduction. The 100mcg dose in H2O Cardio provides meaningful cardiovascular support as part of the B vitamin complex. Look for products listing "5-MTHF" or "Methylfolate" rather than standard folic acid for maximum benefit.
Research Notes
- Papakostas et al. (2012) — Randomized trial in Journal of Clinical Psychiatry found L-methylfolate (15mg) significantly improved depression outcomes when added to antidepressant treatment in patients who hadn't responded to medication alone.
- Homocysteine Lowering Trialists' Collaboration (2005) — Meta-analysis found folate supplementation reduced homocysteine levels by 25%, a significant cardiovascular risk reduction.
- Stover (2004) — Review in Journal of Nutrition highlighted folate's critical role in DNA synthesis, methylation, and cancer prevention.
- Prinz-Langenohl et al. (2009) — Study found 5-MTHF raised blood folate levels twice as effectively as standard folic acid.
- Homocysteine Lowering Trialists' Collaboration (2005) — Meta-analysis found folate supplementation reduced homocysteine levels by 25%, a significant cardiovascular risk reduction.
- Stover (2004) — Review in Journal of Nutrition highlighted folate's critical role in DNA synthesis, methylation, and cancer prevention.
- Prinz-Langenohl et al. (2009) — Study found 5-MTHF raised blood folate levels twice as effectively as standard folic acid.
* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.