MTHFR - MethylTetraHydroFolate Reductase Deficiency by Dr. Neil Rawlins

One of the benefits of L-Methylfolate Supplements is that they do not need to be converted by the body into a bioactive form before being absorbed and used by the cells. Another advantage that L-MTHF (or L-5-MTHF) has over folic acid is that it does not mask a vitamin B12 deficiency.