Swanson Vitamin B-12 Lozenges play a major role in the production of the red blood cells that deliver oxygen to all parts of the body, which in turn generates energy. Also known as "the energy vitamin," this fast-acting formula also supports cardiovascular health by working with folic acid to neutralize harmful homocysteine. Each lozenge delivers a potent 1,000 mcg of vitamin B-12 fortified with 400 mcg of folic acid.