Unlike common cyanocobalamin B12, the methylcobalamin in the Zhou Methyl B12 sublingual is the most bioavailable form of B12 for active energy. Methyl B12 provides optimal absorption and retention by the body so you get the most out of every lozenge. Usually found in animal products, supplementing B12 is especially important for vegans and vegetarians. This essential vitamin may help support memory and focus, nerve function, and a healthier heart.