A Superior Form of B12 Energy Production and Brain Function Dietary Supplement Suitable for Vegetarians/Vegans Vegan 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 serious, persons on stomach acid reducing regimens, and some vegetarians/vegans.