3 Natural bioactive B12 forms for optimal synergy: Our full spectrum vitamin B12 5000 mg complex contains all 3 active, naturally occurring coenzyme forms (methylcobalamin, adenosylcobalamin, and hydroxocobalamin) of B12 which each provide a different benefit for the body. Different people respond differently to each form, so an all-in-one supplement ensures effectiveness. 5000 mcg B12 + 1000 mcg methylfolate per capsule: Maximum strength cobalamin with 1000 mcg of methylated folate (L-5-MTHF) per serving. Works with B12 to lower homocysteine (important for heart and brain) and maintain healthy dopamine levels as well as normal sleep patterns. NO fillers! Methylcobalamin B12: the most common and bioavailable form in the body and the one needed to raise B12 level in the body and brain, helps with nervous system function, energy, and cognitive functioning.