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ON Serious Mass

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Optimum Nutrition Serious Mass is the ultimate weight gain formula designed to help you pack on size and build lean muscle mass. This high-calorie, high-protein supplement is perfect for hard gainers and individuals looking to amplify their muscle-building results. With a delicious taste and a carefully crafted blend of premium ingredients, Serious Mass provides the fuel your body needs to reach your size and strength goals.

Storage: Store Optimum Nutrition Serious Mass in a cool, dry place, away from direct sunlight. Ensure the container is tightly sealed to maintain product freshness and potency.

Recommended use:

  • Mix 2 scoops of the powder into 24 fluid ounces 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.


The precise formulation includes proteins, carbohydrates, vitamins, and minerals to meet your nutritional needs and enhance muscle recovery and development.