Micellar Casein is a slowly digested, complete protein, with an excellent amino acid profile that typically has over 4,500 mg of BCAAs (Branched Chain Amino Acids) per 1 scoop serving. Because Micellar Casein thickens in the low pH of the stomach, slowing down its entry into the intestines, its amino acids are released in a sustained manner. NOW Micellar Casein mixes easily in your favorite beverage and is an ideal choice for sustained protein support.