Methyl B-12 (methylcobalamin) supports brain and nerve health and function, energy production, cell-replication, red blood cell production and sleep-wake cycles. Methyl B-12 is also required to metabolize homocysteine back into the essential amino acid L-methionine. Methyl B-12 is better absorbed and retained than cyanocobalamin, and supplementation may be needed by seniors, persons on stomach acid reducing regimens, and some vegetarians/vegans.