Optimum Nutrition Serious Mass 5.4kg | 16 Servings

Support bulking, calorie surplus, recovery, and strength goals with ON Serious Mass. 1,250 calories, 50g protein, and 252g carbs.

Optimum Nutrition Serious Mass – High-Calorie Weight Gainer Support

Optimum Nutrition Serious Mass is designed for hard gainers, bodybuilders, and athletes who need extra calories, protein, and carbohydrates to support bulking phases and intense training routines.

Each serving provides 1,250 calories, 50g blended protein, and 252g carbohydrates, plus added Creatine Monohydrate, glutamine support, and essential vitamins and minerals to help increase daily calorie and nutrient intake.

Key Benefits

1,250 calories per serving
50g blended protein
252g carbohydrates for calorie support
Supports bulking and mass-gain routines
Includes creatine, glutamine, vitamins, and minerals
5.4kg / 16 servings

Why Choose Optimum Nutrition Serious Mass?

A classic high-calorie mass gainer for athletes who struggle to meet calorie needs from food alone and want protein, carbs, creatine, and micronutrients in one shake.

Who Is It For?

Ideal for:

Hard gainers
Bodybuilders
Bulking phases
Strength athletes
Anyone needing extra calories and protein

How to Use

Mix 2 heaping scoops with water or milk. Take after training or between meals to help increase daily calorie, carbohydrate, and protein intake.

Product Specifications

Specification	Details
Brand	Optimum Nutrition
Product	Serious Mass
Net Weight	5.4kg
Servings	16
Serving Size	2 Heaping Scoops
Calories	1,250 kcal
Protein	50g
Total Carbohydrates	252g
Creatine Monohydrate	3g
Protein Sources	Whey Protein Concentrate, Calcium Caseinate, Egg Albumin
Added Support	Creatine, Glutamine, Vitamins & Minerals
Allergens	Contains egg, milk, soy, and wheat
Best For	Bulking, calorie surplus, recovery support, mass-gain routines
Category	Mass Gainer / Weight Gainer

About Optimum Nutrition (ON) Optimum Nutrition is one of the world’s leading sports nutrition brands, trusted by athletes and fitness enthusiasts for decades. Known for its iconic Gold Standard Whey Protein, ON provides a wide range of premium supplements designed to support performance, muscle growth, recovery, and overall health. Every product is crafted with high-quality ingredients and tested for purity to ensure safety and effectiveness. Whether your goal is building lean muscle, boosting endurance, or maintaining a healthy lifestyle, Optimum Nutrition delivers the fuel your body needs to perform at its best. With a reputation for innovation, quality, and consistency, ON remains the go-to choice for anyone serious about their fitness journey.