Jarrow Formulas Methyl B-12 500 mcg (methylcobalamin) is the biologically active coenzyme form of vitamin B12. Each cherry-flavored chewable tablet delivers 500 micrograms (mcg) of methyl B-12, which helps support brain and nerve health, energy production, cell replication, red blood cell production, and sleep-wake cycles.* This formula is gluten free and contains no wheat, soybeans, dairy, egg, fish/shellfish, or peanuts/tree nuts.