Protein Milk is a great tasting, refreshing shake that is packed with 20g of protein goodness to keep your muscles in tip top shape. Protein Milk is a great tasting, refreshing shake that is packed with 20g of protein goodness to keep your muscles in tip top shape. After all, protein is the stuff you"re made of and is one of the building blocks of life, so it"s essential to keep your body topped up in order to take on life"s challenges. Protein Milk contains a blend of skimmed milk proteins that naturally contain whey and Branched Chain Amino Acids (BCAAs), essential building blocks of protein, its fat free and has no added sugar. This is a great option for an on the go refreshing drink.