RED REX BIG WHEY is an excellent source of clean Protein and Amino Acids, making it one of the best protein sources for building muscle and improving exercise performance.* With optimal nutritional’s and great taste, we provide a complete protein for sustained energy and muscle development.* REDREX Big Whey has one of the highest concentrations of functional protein out of any of the protein sources. A single serving of this Whey Protein contains an astounding 24 grams of protein, Serious protein power of Concentrated Whey.