Genestra Active Chewable B12 with L-Methylfolate - ACTIVE Chewable B₁₂ with L-Methylfolate supports normal macronutrient metabolism and red blood cell formation. Methylcobalamin and L-methylfolate help maintain already normal plasma levels of the protein metabolite homocysteine. In a recent study, high-dose supplementation with methylcobalamin and folic acid for two weeks supported already healthy plasma homocysteine levels.