The Muscle Building Power Of Beef Protein Now In An RTD! Enjoy the great taste and quality muscle building nutrition of CARNIVOR, the World’s #1 Selling Beef Protein Isolate supplement, in a delicious ready-to-drink shake! CARNIVOR High Protein RTD is the first protein shake of its kind to be made with USDA inspected beef protein. Its advanced hydrolysis technology provides 40 grams of muscle building protein per delicious serving with 0 fat, 0 cholesterol, 0 sugar, 0 lactose and 0 gluten. Plus, CARNIVOR RTDs are loaded with amino acids from high quality beef protein and fortified with branched chain amino acids (BCAAs).