Musashi IS08 WPI: New Formula Whey Protein Isolate is an easily digestible supplement low in fat, lactose & carbohydrates containing high quality whey protein to aid growth and repair of muscle tissue. WPI is also fortified with additional Essential Amino Acids including Branch Chain forms to aid muscle tissue saturation. This can assist resistance athletes with lean body mass accruals when consumed close to training times. The key benefits of WPI: Whey Protein Isolate are;