Hardcore training can deplete your bodys minerals. Make sure you have adequate mineral support with ZMA. This unique formula contains highly bioavailable forms of magnesium and zinc, including zinc l-monomethionine (opti-zinc). 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.