MET-Rx RTD 51 15oz - Now fitness-minded individuals can get exactly what they want in a ready-to-drink shake—high performance protein and more of it! MET-Rx RTD 51 is the powerhouse of protein shakes. Each nutritionally advanced, ready-to-drink shake is packed to the max with 51 grams of Metamyosyn® protein that helps support muscle.* **Low in fat and containing 4g - 6g (depending on flavor) net carbs, it’s also a natural source of valuable amino acids. Get shakin’ in your choice of delicious Frosty Chocolate, Creamy Vanilla flavors, Mocha Blast, and Cookies & Crème.