ZMA is a potent combination of synergistic antioxidants, vitamin B6 plus key ingredients zinc and magnesium. Zinc and magnesium are both catalysts necessary for adult males to produce optimal levels of testosterone, so they have been combined here to act as a natural testosterone booster. Containing no hormones, pro-hormones, metabolites or precursors, ZMA supports anabolism – the strengthening and growth of muscle tissue.