Pure Encapsulations - Adenosyl/Hydroxy B12Adenosyl Hydroxy B12 offers a unique blend of vitamin B12 , as adenosylcobalamin and hydroxycobalamin. Hydroxycobalamin is a precursor form of vitamin B12 converted in the body's to both methylcobalamin and adenosylcobalamin. It is similar to cyanocobalamin without the cyanide moiety. Adenosylcobalamin is an activated form similar to methylcobalamin. While methylcobalamin is found in the cytosol of cells and predominates in blood and other fluids,