Natural Factors - B12 Methycobalamin Bonus - 210 Capsule(s) - NPN: 80009448 -- Helps control homocysteine levels Enhances immune system function Effectively supports brain and nerve function. May help in the treatment of sleep-wake disorders May improve daytime alertness in shift-workers and the elderly Derived from vegetable sources, it is an excellent source of vitamin B12 for vegetariansNatural Factors B12 Methylcobalamin is the biologically active form of vitamin B12, the form most readily absorbed into the body. It is a water-soluble vitamin that is necessary for various bodily processes, including energy production, nervous system function, and production of genetic materials DNA and RNA.