Most B vitamins function in the body only in their coenzyme (or active) forms, and the normal form as within B-12 or certain B-complex has to be changed into the coenzyme form before it can do its job. These coenzyme forms are generally  more costly and are considered more potent than standard vitamin forms. Methylcobalamin is one of these brilliant coenzyme forms. Since it’s already in its coenzyme form and doesn’t require conversion, your body can use it right away as opposed to having to follow along with the conventional metabolic pathway for conversion.