Studies have shown that taking supplemental zinc and magnesium can elevate testosterone levels significantly. ZMA is a unique anabolic mineral support formula containing highly bioavailable forms of the two minerals; zinc monomethionine (L-OptiZinc® - US Patents 4764633 and 5278329 pending) and covalently-bound zinc/magnesium aspartate. Fortified with absorption- and utilization-enhancing B vitamins this powerful, all-natural, nonsteroidal testosterone-booster also increases insulin-like growth factor (IGF-1) for proven muscle strength increase during workouts.

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• ISS Research