About this item King Mass XXL packs a massive 50g of protein per serving to help keep your muscles fed. Flooding your muscles with protein, carbs, glutamine and creatine, may support your insulin response leading to more glycogen storage and recovery preparing you for your next workout. Signature Series Extreme Limited Edition King XXL Muscle Mass Gainer 50g protein, 282g carbs, 1440 calories. King mass xxl is designed to help those hard gainers get the calories and nutrients required to put on that size they have been struggling for their whole life.