Extreme Labs ZM8 is a high-quality Zinc Magnesium product that has been formulated to enhance normal testosterone levels & accelerate recovery times. Zinc contributes to normal fertility & reproduction, normal protein synthesis & normal function of the immune system while Magnesium supports electrolyte balance, normal muscle function & a reduction in tiredness & fatigue. B6 contributes to a variety of biological processes which include the normal function of the immune system, reducing tiredness & fatigue, normal protein & glycogen metabolism & finally the normal functioning of the nervous system.