Optimum Nutrition Serious Mass

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To gain weight, you need to consume more calories than you expend. For many aspiring to hit their calorie goals and put on size, a highly active metabolism, weak appetite or on-the-go lifestyle can make it a real challenge to get enough calories from food alone.

SERIOUS MASS is the ultimate muscle building and weight gain formula. With 1,250 calories per 2-scoop serving and 50 grams of protein to support muscle recovery, this powder makes the ideal post-workout and between meals shake for sizing up your goals. SERIOUS MASS provides you with the tools you need to support your weight gains goals.


  • Training longer and harder to gain more muscle

  • Finding it difficult to consume enough calories through food alone

  • Finding it challenging to gain weight regardless of your dietary intake.

Serious Mass provides you with all the tools you?ll need to pack on the pounds.


  • 1,250 Calories per Serving to Help Support a Calorie Surplus for Weight Gain and Muscle Building

  • 50 Grams of Blended Protein per Serving to Help Build and Maintain Muscle

  • 252-254 Grams of Carbohydrates (with no added sugar) to Help Fuel Workouts and Aid in Replenishment of Glycogen Stores

  •  3g Creatine Monohydrate To Support Muscle Strength, Power And Size When Combined With High-Intensity Activities

  • 20 Additional Vitamins and Minerals (including L- Glutamine) 

  • Ideal Formula to Support Weight Gains

  • Available in a Range of Sizes and Great Tasting Flavours

  • Enjoy Post Work-out and Between Meals


Mix 2 scoops of the powder into 700-720ml of cold water or milk using an electric blender. This allows to you add in fruits, peanut butter and other calorie-contributing foods. TIP: New users should start with a 1-scoop half serving. Use post-workout and/or between meals to add calories, carbs and protein to your healthy, balanced diet.