• Free Bird Nutrition Club
  • Free Bird Nutrition Club
  • Free Bird Nutrition Club
  • Free Bird Nutrition Club

Optimum Nutrition Serious Mass


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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.¹

  • Purity - The neck of the tub is sealed with an induction vented liner inside the cap. The product has a plastic shrink wrap seal around the cap (outside) for protection.
  • Who Needs Serious Mass: People with very active metabolism that struggle to gain weight
  • Athletes or anyone who has extremely high energy needs that can-not be met only with food.
  • How to Use: Prepare using an electric blender. Add fresh or frozen fruits, peanut butter, nuts & other calorie dense foods to boost your weight gain potential.
  • When to Consume: Use post-workout and/or between meals to add calories, carbs and protein to your healthy, balanced diet.
  • What is Serious Mass: Optimum Nutrition Serious Mass is a high calorie weight gainer which is also high in protein and when taken over time with regular resistance exercise  and a balanced diet can help you gain mass and muscle.