High quality Zinc formula It has long been known that those involved in intense exercise have a higher need for certain nutrients to maintain health & recover. Recent research has highlighted that exercise can deplete essential minerals that if not replaced compromise the recovery process. Carefully selected ingredients The zinc is contained in a highly bioavailable form which contributes to the maintenance of normal testosterone levels in the blood, normal fertility & reproduction, normal function of the immune system, normal carbohydrate & metabolism & protein synthesis, protection of cells from oxidative stress as well as normal cognitive function. The magnesium also contained in a highly bioavailable format contributes to normal muscle function, normal energy-yielding metabolism, a reduction of tiredness & fatigue & normal functioning of the nervous system. This special formula is different to other ZMA formulations in that it also contains the addition of amino acid chelated copper & boron. Copper is included to help maintain an optimal zinc to copper ratio within the body & contributes to the normal function of the immune system & nervous system.