Build mass with Whey Protein Isolate Whey Protein Isolate from Hero.Lab is a great whey protein isolate, which in its composition has as much as 85% of valuable proteins. It will improve your performance and regeneration, and will help you develop lean muscle mass. It is HACCP and GMP certified. WPI, i.e. whey protein isolate, is not only delicious, easily digestible, but also does not cause any ailments in the digestive system. Thanks to the fact that it is low in calories and high in protein, it will help you quickly build the desired muscle mass! By taking it before, during or after training, you also ensure faster regeneration. What does it give you? You can train longer and harder!