Thorne is a gold-standard clinician brand, and this is its therapeutic-dose methylfolate: 1 mg (1,000 mcg) of L-5-MTHF, third-party tested. For someone with elevated homocysteine, a documented MTHFR variant, or a clinician's instruction to take a higher active-folate dose, it is a well-made, trustworthy choice. But read the dose honestly — 1 mg is well above the 400–800 mcg prenatal target, and for the general population that extra is neither needed nor proven to help. It ranks in the lower half because it pairs a premium price with a dose most women simply do not require, in a form without NTD-prevention evidence.
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Read the complete Folate guide →Methylfolate lacks NTD-prevention trials, and a therapeutic dose does not change that — no evidence 1 mg prevents more defects than 400 mcg folic acid.
Bioidentical L-5-MTHF, conversion-free, from a brand with rigorous quality control.
1 mg is above the 400–800 mcg prenatal window — appropriate for therapeutic use but excessive for routine prevention.
Thorne is known for rigorous third-party testing and athletic-grade quality control.
About $22 for 60 capsules — a premium price for a dose most buyers don't need.
“1 mg methylfolate is better for MTHFR carriers”
Active folate bypasses conversion and higher doses can lower homocysteine, but there is no evidence a 1 mg dose improves pregnancy outcomes over standard 400–800 mcg for typical carriers (PMID 19298256, PMID 23482308).
“Therapeutic-dose folate prevents NTDs better”
No trial shows 1 mg methylfolate prevents more neural-tube defects than the standard folic acid dose; folic acid holds the prevention evidence.
Thorne's quality is real, but 1 mg of active folate is a therapeutic dose aimed at homocysteine or methylation issues — not the profile a healthy woman needs for basic NTD prevention.
Above the 400–800 mcg target there is no added NTD-prevention benefit, and high active-folate intakes are still an area of ongoing study — so the extra milligram is cost without a proven upside for most.
Buy this if a clinician has directed you to a higher active-folate dose, or you are managing elevated homocysteine. It is superbly made. But for routine preconception folate it is overkill in a form without NTD-prevention data, which is why it lands mid-pack despite the brand's excellent reputation.
Check Thorne on Amazon5-MTHF raised plasma folate as effectively as folic acid, including in 677TT women, at standard doses.
Folic acid retains NTD-prevention trial evidence; methylfolate remains an unproven alternative.
