Mass Gain is the weight gainer supplement from Purus Labs! Mass Gain will help you easily get extra calories in your diet and is excellent for bulking. Besides the high calorie content, Mass Gain contains an excellent source of protein; 52 grams coming from Whey Protein Concentrate, Isolate, and Casein. This gives you both fast and slow digesting proteins, which is perfect for a mass gainer supplement. Purus Labs has always made supplements with great taste, and Mass Gain is no exception! The chocolate cookie and vanilla wafer flavors that are so loved in MyoFeed (Purus protein supplement), make an appearance in Mass Gain as well.