Optimum Nutrition

ON Serious Mass

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Regular price $154.95

Serious Mass – High-Calorie Weight Gainer for Muscle Growth & Size

Serious Mass is a premium high-calorie weight gainer designed to help athletes and bodybuilders increase size, strength, and recovery. Each serving provides 1,250 calories, 50g of blended protein, and over 250g of carbohydrates to fuel muscle growth and replenish energy stores after intense training.

Formulated with creatine, glutamine, and glutamic acid, plus 25 essential vitamins and minerals, Serious Mass delivers a complete nutritional profile to support performance, recovery, and overall health.

Key Features & Benefits:

  • 1,250 Calories per Serving: Supports healthy weight gain and mass building
  • 50g Protein Blend: Promotes muscle repair and growth after exercise
  • 250g+ Carbohydrates (No Added Sugar): Fuels energy and replenishes glycogen stores
  • Enhanced with Creatine & Glutamine: Assists recovery, strength, and endurance
  • Fortified with 25 Essential Nutrients: Provides vitamins and minerals to support overall wellbeing

Please refer to the nutrition panel.

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.