The goal of this study is to determine the anabolic potency and efficacy of a new and novel Whey Protein Hydrolysate mixture (WPH) on mammalian/mechanistic target of rapamycin complex 1 (mTORC1) signaling leading to skeletal muscle protein synthesis in healthy young subjects (age 20-35 yr). Previous studies on rats indicate WPH induces significant increases in muscle protein synthesis compared with carbohydrates or whey-amino acid mixture. WPH contains mostly peptides, which have physiological effects and could be absorbed more rapidly. Preliminary data from preclinical study has also demonstrated that WPH can stimulate muscle protein synthesis at lower doses compared with intact whey proteins. Thus, WPH could be absorbed more rapidly and may maximally stimulate muscle protein synthesis via activation of mTORC1. Although there is substantial data on the individual effects of BCCA and intact protein such as whey, there have been no clinical investigations that have explored the efficacy of WPH for stimulating muscle protein synthesis in humans.