ON Serious Mass 1LB | 2LBS

High-Calorie Weight Gainer for Muscle Building & Recovery

Optimum Nutrition Serious Mass is a high-calorie weight gainer designed to support muscle building and recovery. Each serving provides up to 1,260 calories, 50 grams of protein, and 253 grams of carbohydrates, along with 5 grams of creatine monohydrate. This formula is ideal for athletes with extraordinary muscle and performance goals. It also includes 19 vitamins and minerals and delivers 8 grams of naturally occurring glutamine per serving.

Key Benefits:

• High-Calorie Formula: Up to 1,260 calories per serving to support weight and muscle building.

• Protein Blend: 50 grams of complete, fast-digesting protein per serving to support muscle building and recovery.

• Carbohydrates: Up to 253 grams of carbohydrates per serving to fuel intense workouts and aid in replenishment of glycogen stores.

• Creatine Monohydrate: 5 grams to support strength, power, and performance.

• Glutamine: 8 grams of naturally occurring glutamine per serving.

• Vitamins & Minerals: A good source of 19 vitamins and minerals per serving.

Serious Mass is Optimum Nutrition's highest-calorie weight gain formula, created specifically to provide maximum macros for athletes with extraordinary muscle and performance goals. It is trusted by elite strength athletes worldwide and is everything you’ve come to expect from Optimum Nutrition: The World’s #1 Sports Nutrition Brand.