Methylfolate Supplements Guide (2026): Evidence-Based Comparisons

By Erin Rose · Updated June 25, 2026 · Methodology · About Us

The dose gap nobody mentions

Methylfolate is sold as a better-absorbed everyday folate, and some marketing points to much larger doses used in research. The two are not in the same range.

The higher-dose amount in that marketing is 15 mg a day, sold as a prescription medical food in the US, not a supplement. What is on the shelf: 0.4 to 1.7 mg. The three products we track run 400 mcg, 1,000 mcg and 1,700 mcg per serving. The largest of them is 1.7 mg — roughly a ninth of the 15 mg amount. Reaching 15 mg would mean taking nine of the strongest tablets a day, which is not what the label directs.

That is not a reason to avoid methylfolate. A 400–1,700 mcg tablet is a nutritional folate dose, in the range of the 400 mcg daily requirement. It is not the prescription product, and no amount of marketing copy closes a ninefold gap.

Methylfolate or folic acid?

The case for methylfolate is that it is the form the body actually uses, so it does not depend on an enzyme step in the body. A pharmacokinetic study comparing the two found 5-methyltetrahydrofolate to be at least as good as folic acid at raising folate status (PMID 14769778), and it avoids the unmetabolised folic acid that accumulates at higher intakes.

If you are pregnant or planning to be, ask your clinician about folate.

What one study measured

One study compared how quickly serum folate rose.

A pharmacokinetic study gave folate-insufficient women either 5-MTHF or folic acid and tracked serum folate. Total folate rose considerably faster over the first four days on 5-MTHF (P for trend <0.0001), and nearly all the women given 5-MTHF reached 50 nM serum folate very quickly — a level that could then be held with a routine 0.4 mg of folic acid daily (PMID 29511242). This is one small pharmacokinetic study of blood folate. It does not show that either form treats any condition.

Another point people raise

Folic acid at higher intakes can appear unmetabolised in the bloodstream, and with staple foods fortified in many countries that exposure is chronic rather than occasional. The clearest documented risk is not exotic: unmetabolised folic acid can mask a vitamin B12 deficiency, correcting the anaemia while the neurological damage continues (PMID 9174474). Ask your clinician whether this applies to you.

Two practical consequences. If you take folate of any kind long-term and are over 50, vegetarian, on metformin or on a proton-pump inhibitor — all groups with higher B12 depletion risk — check B12 alongside it rather than assuming a normal blood count means you are fine. Label doses here are 400 to 1,700 mcg.

The three products we track

All are single-ingredient L-methylfolate. Note the fourfold spread in dose, which makes cost per day a misleading comparison on its own — the cheapest daily cost here also happens to be the largest dose.

Check price →

Common questions

Which of these should I buy?

If you want a nutritional dose near the 400 mcg requirement, the Jarrow product is that dose. The Life Extension tablet is the largest dose, and the Thorne label states a third-party certification that we did not find in a public registry. Match the dose to the reason first, then compare price.

About our data

Every comparison uses clinical evidence from PubMed systematic reviews, product label data from the NIH Dietary Supplement Label Database, and third-party certifications (USP, NSF). Products are ranked by cost per day. See our methodology and editorial standards.