Boost Your Lean Muscle Mass Rapidly | GXN Iso Legend GXN ISO Legend (Zero) is a whey protein isolate supplement, used to increase protein intake. ISO Legend whey protein isolate is an ultra-premium protein powder, delivers a sharp 30g of protein in each serving. Buy now to improve your athletic performance and increase muscle size. https://www.gogxn.com/blog-visit/know-all-about-gxn-iso-legend-for-your-lean-muscle-goal/