Dietary Supplement. Speciality Supplement. Essential minerals for energy metabolism & recovery*. Zinc, magnesium & vitamin B-6 ZMA® is a unique mineral support formula containing highly bioavailable forms of magnesium and zinc, including zinc L-Monomethionine . Contains Vitamin B-6, which acts as a cofactor to an enzyme required for aspartate metabolism.*. Zinc is involved with energy metabolism*. Magnesium is an essential component of the muscle enzyme creatine kinase and is a vital factor in energy production and muscle.