ZMA®-powered supplements help increase total and free testosterone levels, insulin-like growth factor (IGF-1), muscle strength and muscle power. Testosterone and IGF-1 are involved in muscle recovery and regeneration processes. Increases in testosterone and IGF-1 are associated with greater muscle power and strength. ZMA® is an anabolic support formula for supplements containing highly bioavailable zinc mon-L-methionine sulfate (L-OptiZinc®), zinc/magnesium aspartate and vitamin B6.