RuckPack’s Pure Protein Isolate is the perfect nutritional component to supplement your fitness regimen. It promotes lean muscle growth and helps burn fat throughout the day. RP Refit Isolate contains an impressive amino acid profile. It is easily digested, and it is lactose free, sugar free, and fat free! This fast absorbing WPI quickly transports amino acids to the muscles for maximum muscle recovery and explosive gains! RP Refit Isolate delivers only the highest quality pharmaceutical grade whey proteins.