A high potency active B12 supplement containing 1mg of methylcobalamin and adenosylcobalamin, which are both active forms of this important vitamin. Both methylcobalamin and adenosylcobalamin are essential to providing coenzyme or active b12 to different parts of the tissue Both forms of b12 are often used together as team players Methylcobalamin is optimally bioeffective Adenosylcobalamin plays a role in mitochondria, methylation tolerance, myelin formation, and neurological function and is often lacking in the diet.