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Levomefolic acid (INN, also known as L-5-MTHF, L-methylfolate and L-5-methyltetrahydrofolate and (6S)-5-methyltetrahydrofolate, and (6S)-5-MTHF) is the primary biologically active form of folate used at the cellular level for DNA reproduction, the cysteine cycle and the regulation of homocysteine.
Cerefolin is a prescription medication made by Pamlab that contains 5.635 mg of folate as L-methylfolate, 1 mg of vitamin B 12 as methylcobalamin, 50 mg of vitamin B 2 as riboflavin, and 5 mg of vitamin B 6 as pyridoxine. It is approved by the U.S. Food and Drug Administration for the treatment or prevention of vitamin deficiencies. [1]
Metanx is a prescription medical food made by Alfasigma that contains L-methylfolate (as Metafolin, a calcium salt of vitamin B 9), methylcobalamin (vitamin B 12) and pyridoxal 5'-phosphate (vitamin B 6). It is a vitamin B supplement. Metanx is indicated for the dietary management of peripheral neuropathy (i.e. DPN). [1]
A serum folate level of less than 7 nmol/L (3 μg/L) is indicative of folate deficiency; Red blood cell folate testing is not routinely performed, since serum folate is sufficient in most cases, however, if there is a strong suspicion of folate deficiency despite a normal serum folate level, a red cell folate test may be performed.
A serum folate of 3 μg/L or lower indicates deficiency. [98] Serum folate level reflects folate status, but erythrocyte folate level better reflects tissue stores after intake. An erythrocyte folate level of 140 μg/L or lower indicates inadequate folate status. Serum folate reacts more rapidly to folate intake than erythrocyte folate. [113]
4524 17769 Ensembl ENSG00000177000 ENSMUSG00000029009 UniProt P42898 Q9WU20 RefSeq (mRNA) NM_005957 NM_001330358 NM_001161798 NM_010840 RefSeq (protein) NP_001317287 NP_005948 NP_001155270 NP_034970 Location (UCSC) Chr 1: 11.79 – 11.81 Mb Chr 4: 148.12 – 148.14 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Methylenetetrahydrofolate reductase (MTHFR) is the rate-limiting enzyme ...