Natural Factors Methylcobalamin B12 provides 10,000 mcg of vitamin B12 in its most bioactive form. This one-a-day sublingual formula supports the normal function of the immune system, energy metabolism, red blood cell formation, and helps maintain good health. Methylcobalamin demonstrates exceptional activity immediately upon absorption over other forms of B12 such as cyanocobalamin.Medicinal IngredientsNon-Medicinal IngredientsMannitol, croscarmellose sodium, natural cherry flavour, vegetable grade magnesium stearate (lubricant).Helps form red blood cells and prevent vitamin B12 deficiency. Helps to maintain the bodyÕs ability to metabolize nutrients and in the normal function of the immune system. Methylcobalamin, the active form of B12, demonstrates exceptional activity immediately upon absorption, while other forms such as cyanocobalamin must be converted to methylcobalamin in a two-step process .