this 'performance whey' contains 23 g of protein per serving, with the addition of magnesium., supports muscle repair & recovery, 23g protein per serving, magnesium contributes to muscle contraction & normal protein synthesis, nature's best sport offers a world class range of premium, uk made supplements.nature's best whey protein is a superior whey, supporting lean muscle goals. each scoop provides 23g protein & less than 2g fat & 2g of carbs per serving. magnesium has also been added to this superior whey for a magnitude of reasons. magnesium contributes to muscle contraction & normal protein synthesis. this mineral is vital for energy production & plays a key role in helping to facilitate muscle relaxation.