Allergy Research B12 MethylcobalaminThis supplement provides an active form of vitamin B12, in the form of Methylcobalamin is used to treat vitamin B12 deficiency. Vitamin B12 is important for the brain and nerves, and for the production of red blood cells. B12 Methylcobalamin x 50 Lozenges This supplement provides what is referred to as an active form of vitamin B12, in the form of methylcobalamin, with folic acid. Regular B12 (cyanocobalamin) must be converted to an active form, such