Whey Protein Isolate Unflavored Powder - Natural Unflavored. NOW Whey Protein Isolate is a high quality protein that is both bioavailable and easily digested. Whey protein has naturally occurring Branched Chain Amino Acids (BCAA's). NOW Whey Protein Isolate is ideal for active individuals. Whey protein is considered to have the highest Biological Value of any protein source - superior in essential amino acid content to beef, milk, casein or soy. This product is sold by weight not volume.