MET-Rx. One 2 lb container of MET-Rx Metamyosyn Protein Plus Whey Isolate and Casein Chocolate Protein Powder MET-Rx Metamyosyn Protein Plus contains better than a 5:1 ratio of protein to carbs to help meet your nutritional goals with delicious protein shakes Casein and Whey Isolate protein powder includes a combination of both slow-acting and fast-acting protein, delivering a more prolonged absorption rate MET-Rx protein powder is ideal as a protein shake powder; use to make a chocolate protein shake, protein smoothies, or other protein drinks Each serving of this chocolate protein shake powder contains 21 grams of protein and essential amino acids