Essential minerals for energy metabolism & recovery support. Zinc, Magnesium and Vitamin B-6. ZMA IS A UNIQUE MINERAL SUPPORT FORMULA CONTAINING HIGHLY BIOAVAILABLE FORMS OF MAGNESIUM AND ZINC, INCLUDING ZINC L-MONOMETHIONINE (L-OPTIZINC). 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 contractions.