Methyl 12 Plus blends together two biologically 'active' forms of vitamins B12 which contains both (methylcobalamin and adenosylcobalamin) to maximize absorption and utilization and help support a healthy nervous system and aid in blood cell production. It also contains nature identical and fully active Vitamin B9 (folate). Please note: Methyl 12 Plus does not contain the synthetic form of B9, often referred to as folic acid.