L-5-methyltetrahydrofolate versus folic acid: bioavailability and efficacy in folate deficient subjects
European Journal of Clinical Nutrition, 2004
L-5-methyltetrahydrofolate (L-5-MTHF) 1,000 mcg per capsule the biologically active form of folate (vitamin B9) that circulates in the bloodstream and crosses the blood-brain barrier. Unlike folic acid, which requires a multi-step enzymatic conversion to become metabolically active, L-5-MTHF is ready for immediate use in folate-dependent pathways including red blood cell formation, homocysteine metabolism, DNA synthesis, and energy metabolism.
Folic acid is the synthetic, oxidized form of folate used in most supplements and fortified foods. To become metabolically active, folic acid must be reduced and methylated through a series of enzymatic steps ultimately to L-5-MTHF by enzymes including dihydrofolate reductase (DHFR) and methylenetetrahydrofolate reductase (MTHFR). This conversion is rate limited and can be impaired by common genetic variants in the MTHFR gene (particularly C677T and A1298C), which reduce MTHFR enzyme activity and the efficiency of folic acid conversion.
L-5-MTHF bypasses this conversion entirely. As the end product of the folate metabolic pathway, it enters folate-dependent reactions directly supporting red blood cell formation, homocysteine remethylation to methionine, purine and pyrimidine synthesis for DNA replication, and one-carbon metabolism without requiring MTHFR activity.
L-5-methyltetrahydrofolate (L-5-MTHF) 1,000 mcg per capsule the biologically active form of folate (vitamin B9) that circulates in the bloodstream and crosses the blood-brain barrier. Unlike folic acid, which requires a multi-step enzymatic conversion to become metabolically active, L-5-MTHF is ready for immediate use in folate-dependent pathways including red blood cell formation, homocysteine metabolism, DNA synthesis, and energy metabolism.
Folic acid is the synthetic, oxidized form of folate used in most supplements and fortified foods. To become metabolically active, folic acid must be reduced and methylated through a series of enzymatic steps ultimately to L-5-MTHF by enzymes including dihydrofolate reductase (DHFR) and methylenetetrahydrofolate reductase (MTHFR). This conversion is rate limited and can be impaired by common genetic variants in the MTHFR gene (particularly C677T and A1298C), which reduce MTHFR enzyme activity and the efficiency of folic acid conversion.
L-5-MTHF bypasses this conversion entirely. As the end product of the folate metabolic pathway, it enters folate-dependent reactions directly supporting red blood cell formation, homocysteine remethylation to methionine, purine and pyrimidine synthesis for DNA replication, and one-carbon metabolism without requiring MTHFR activity.
Serving Size: 1 Capsule
Servings Per Container: 90
† Daily Value not established
European Journal of Clinical Nutrition, 2004
American Journal of Clinical Nutrition, 1999
Nutrients, 2017
Research information is provided for educational purposes and does not replace the product's approved label information.