Zinc and Magnesium is a blend of essential vitamins and minerals which is usually taken before bed to combat tiredness and fatigue and also normalise testosterone levels in the blood. Fused with Vitamin B6 and Copper for added cognitive support, the synergistic blend is widely used amongst athletes who undertake regular exercise Containing 10mg Zinc (100% RDA). 150mg of magnesium in its most bioavailable form (Magnesium Citrate) (40% RDA), 3.5mg Vitamin B6 and 0.23mg of copper. You can see why this is popular amongst the Protein Works.