Folate that works. The form your genes might need. Provides active folate for methylation, DNA synthesis, and neurotransmitter production. Essential for pregnant women and anyone with MTHFR variants.
Reviewed March 2026
Public health figures for this ingredient, reported by the agencies that publish them, cited and dated.
About 27% of US women aged 71 and over
take in less folate from food and drink than the estimated average requirement.
USDA ARS, Usual Nutrient Intake from Food and Beverages, by Gender and Age, WWEIA NHANES 2013-2016, Table A 22 (folate as dietary folate equivalents), females 71+: 27% below EAR (SE 2.7). ↗About 18% of US women aged 19 to 50
take in less folate from food and drink than the estimated average requirement.
USDA ARS, Usual Nutrient Intake from Food and Beverages, by Gender and Age, WWEIA NHANES 2013-2016, Table A 22 (folate as dietary folate equivalents), females 19-50: 18% below EAR (SE 1.7). ↗About 21% of US girls aged 14 to 18
take in less folate from food and drink than the estimated average requirement.
USDA ARS, Usual Nutrient Intake from Food and Beverages, by Gender and Age, WWEIA NHANES 2013-2016, Table A 22 (folate as dietary folate equivalents), females 14-18: 21% below EAR (SE 4.3). ↗About 8% of US men aged 19 and over
take in less folate from food and drink than the estimated average requirement.
USDA ARS, Usual Nutrient Intake from Food and Beverages, by Gender and Age, WWEIA NHANES 2013-2016, Table A 22 (folate as dietary folate equivalents), males 19+: 8% below EAR (SE 0.9). ↗Population figures from public health data. Context for the category, not a statement about any individual and not a claim about this product.
Source: NIH ODS + Bailey 2015 review
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
Based on 35 human trials with 85% consistency.
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
Folic acid and 5-MTHF both cross the intestine through the proton-coupled folate transporter and the reduced folate carrier, so they compete for the same entry routes when taken together. Folic acid then needs dihydrofolate reductase to enter the active pool, while 5-MTHF is already in the circulating form. Large folic acid intakes raise unmetabolised folic acid in plasma because that reduction step is slow in humans. Formulators generally pick one of the two rather than stacking them.
Folinic acid (5-formyl-THF) enters the folate pool upstream of the MTHFR step and can be interconverted toward 5,10-methylene-THF and then 5-MTHF. That places it on the nucleotide-synthesis side of the pathway while 5-MTHF sits on the methylation side. The two occupy different points of the same cycle rather than duplicating each other.
Homocysteine sits at a branch point: 5-MTHF drives remethylation back to methionine, while the transsulfuration arm sends it to cystathionine and then cysteine. NAC supplies cysteine directly, which changes demand on that second arm. The interaction is mechanistic and measured as a marker, not an outcome.
Endogenous creatine synthesis by guanidinoacetate N-methyltransferase is one of the largest consumers of S-adenosylmethionine in the body, and every methyl transfer generates homocysteine. Supplemental creatine reduces the need for that synthesis step. Folate status and dietary creatine therefore act on the same methyl-group budget from opposite ends.
Several gut bacterial genera synthesise folate de novo and others consume it, so the colonic folate pool is partly microbial. A 2026 systematic review mapped these mechanisms and their reported clinical links. What is described is a mechanism and an association, not a demonstrated effect of taking the two together.
Bifidobacteria are among the genera credited with folate biosynthesis in the human colon. The same systematic review describes bidirectional traffic, with host folate intake shaping the community and the community contributing to the luminal folate pool. Read it as mechanistic rather than as a tested combination.
Selected lactobacilli carry the biosynthetic genes for folate and have been studied as fermentation vehicles for raising folate content in foods. The systematic review names lactic acid bacteria in that role. No trial of this specific pairing is cited here.
Myo-inositol and a folate form are frequently combined in periconceptional products, and the two act on unrelated pathways. Inositol works through phosphoinositide signalling; 5-MTHF works through one-carbon transfer. The pairing is formulation convention rather than a demonstrated interaction.
Iron salts and a folate form are co-formulated in most prenatal products because both nutrients support normal red blood cell formation through different steps. Folate supplies one-carbon units for nucleotide synthesis; iron is built into haem. Neither improves the absorption of the other, so the pairing is additive rather than enhancing.
A 2025 review discussed folate, B12 and vitamin D together in relation to mood biology, describing overlapping methylation and neurotransmitter-synthesis themes. The ingredient is named inside a broader review rather than tested as a pair. That is an association drawn from literature, not a measured combination effect.
Talk to a doctor before taking 5-MTHF (Methylfolate) if any of these apply to you: overmethylation risk. These are flags to check first, not effects 5-MTHF (Methylfolate) is known to cause.
Not medical advice. Show the label to your pharmacist.5-MTHF is the circulating and transportable form of folate, so it enters the methylation cycle without needing reduction by dihydrofolate reductase.
Methionine synthase transfers the methyl group from 5-MTHF to homocysteine to regenerate methionine, and that reaction requires vitamin B12 as its cofactor.
Methylenetetrahydrofolate reductase converts 5,10-methylene-THF to 5-MTHF, and this is the step that supplemental 5-MTHF bypasses.
Methionine formed in the folate cycle is adenosylated to S-adenosylmethionine, the universal methyl donor for DNA, protein and neurotransmitter methylation.
It is built in a chemistry plant from the same starting pieces as ordinary folic acid, then reduced and methylated so it arrives in the body already in the usable form. The last steps separate out the one mirror-image version the body can use and turn it into a stable powder.
Chemically synthesised. The molecule is identical to the one a plant or an animal makes, and building it deliberately means a known purity, a fixed dose and no crop contaminants. For several nutrients this is the only route that reaches a usable amount.
Synthesis starts from pterin intermediates coupled to para-aminobenzoyl glutamate, the same skeleton as folic acid.
The pteridine ring is reduced to the tetrahydro state and a methyl group is added at N5, giving racemic 5-methyltetrahydrofolate.
The biologically active L-isomer (6S) is separated from its mirror image by crystallisation or chiral resolution, since only the L-form enters human folate metabolism.
Batches are assayed by chromatography for L-isomer purity and residual solvents, and specified on a free-acid basis.
The resolved acid is converted to a calcium, glucosamine or sodium salt and packed under controlled humidity, often with an antioxidant carrier because 5-MTHF oxidises readily.
The whole-food sources on file. A supplement closes the gap, it does not replace dinner.
A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.
These are the studies our verdict leans on, chosen from the 10 we read for 5-MTHF (Methylfolate). The full linked list is below.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.