Thorne's Whey Protein Isolate is NSF Certified for SportĀ®. It provides 21 grams of protein per serving from an easily assimilated, non-denatured whey source. It features a balanced amino acids profile, including lysine and arginine and the branched-chain amino acids leucine, isoleucine, and valine, which allow the body to be better able to benefit from the protein.