5-methyltetrahydrofolate glucosamine — answers to L-5-MTHF (active folate)
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A form of folate (vitamin B9) bound to glucosamine as a stabilizing salt; L-5-methyltetrahydrofolate is the naturally circulating, already-activated form of folate that the body normally produces from dietary folate or folic acid.
Why it’s used
Taken to maintain folate status, support red blood cell formation and DNA synthesis, and in particular to meet folate needs before and during pregnancy; marketed as an alternative for people who prefer or are thought to process this active form differently than folic acid.
What the evidence is for
raising folate status and reducing neural tube defect risk when adequate intake is maintained before and during early pregnancy.
What the evidence says
NIH ODS documents folate as essential, with adequate intake before and during early pregnancy established as reducing the risk of neural tube defects. L-5-MTHF itself is recognized as an effective way to raise folate status; whether it offers meaningful advantages over folic acid for most people is less settled and still debated.
Dose studied
400–1000 mcg — adult RDA (as dietary folate equivalents) up to the tolerable upper intake level, per NIH ODS.
Context
Folate adequacy research generally centers on reaching the recommended daily intake, especially in women who may become pregnant; the glucosamine salt form is a delivery format rather than a change to the folate dose itself.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.