You can find B12 in four chemical compounds: methylcobalamin, hydroxocobalamin, adenosylcobalamin and cyanocobalamin. Methylcobalamin and adenosylcobalamin are in meat and dairy products.

First, it’s important to choose a supplement with a high-quality form of B12, such as methylcobalamin or adenosylcobalamin. These forms are more easily absorbed and utilized by the body than the ...