Serious Mass for Serious Goals

OPTIMUM NUTRITION Serious Mass powder supports muscle building, weight gain, and helps fuel workouts with up to 1260 calories, 50g of protein, up to 253g of carbohydrates, and 5g of creatine monohydrate in every serving ^1,7– all in a convenient shake for easy consumption. This value-priced bundle contains two 12lb. tubs and allows you to choose two of 5 great tasting flavors.

Serious Mass is our highest-calorie weight gain formula – created specifically to provide maximum macros for athletes with extraordinary muscle and performance goals¹. Along with carbs for fueling your most intense workouts and calories to help support your bulking diet, the entire 50g of complete protein comes from fast-digesting whey protein concentrate from milk^1,3. It’s also a good source of 19 vitamins and minerals and delivers 8g of naturally occurring glutamine per serving⁷.

Choose from five rich, great-tasting flavors for a seriously delicious routine you’ll always look forward to in your performance-driven lifestyle. Trusted by elite strength athletes all over the world, it’s everything you’ve come to expect from OPTIMUM NUTRITION: The World’s #1 Sports Nutrition Brand⁴. 

Up to 1260 calories per serving to support calorie surplus for weight and muscle building1,7
50g complete, fast-digesting protein per serving to support muscle building and recovery1,7
Up to 253g carbohydrates per serving to support the fueling of intense workouts and aid in replenishment of glycogen stores1,7
5g creatine monohydrate to support strength, power, and performance1,3,7
Value-priced bundle with two 12lb. tubs
8g naturally occurring glutamine per serving
11g branched chain amino acids (BCAAs) per serving
24g essential amino acids (EAAs) per serving
Good source of 19 vitamins and minerals per serving7
Vitamins A, C, E, and zinc help support a healthy immune system¹
B vitamins to help convert food to cellular energy¹
5 rich, delicious flavors