ON Serious Mass
ON Serious Mass
Optimum Nutrition

ON Serious Mass

$89.95
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Serious Mass High-Calorie Weight Gainer – Fuel Muscle Growth & Bulk Up Fast

Serious Mass is the ultimate high-calorie weight gainer designed for serious athletes and bodybuilders aiming to pack on muscle and increase size. Each serving delivers a massive 1,250 calories and 50 grams of blended protein to support muscle recovery and growth after intense workouts.

This instantized powder provides over 250 grams of carbohydrates with no added sugar, ensuring sustained energy and rapid glycogen replenishment. Enhanced with key performance ingredients like creatine, glutamine, and glutamic acid, Serious Mass also includes 25 essential vitamins and minerals to support overall health and optimize your gains.

Why Choose Serious Mass?

  • 1,250 calories per serving for effective weight gain

  • 50g high-quality blended protein for muscle repair

  • Over 250g carbs without added sugar for clean energy

  • Includes creatine and glutamine for enhanced recovery

  • Packed with 25 essential vitamins and minerals

Fuel your workouts and accelerate muscle growth with Serious Mass — the go-to formula for those ready to size up and achieve their physique goals.

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.

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