Optimum Nutrition Serious Mass is a high calorie mass builder that helps you pack muscle and bulk up quickly by delivering dense calories, plenty protein, and clever carbs. Protein from whey concentrate, calcium caseinate and egg albumen delivers steady amino acids to fuel muscle growth, mirroring Optimum Nutrition's pledge to quality. Creatine monohydrate powers strength during hard sessions, and quick acting carbohydrates top up energy and speed recovery.

Benefits & Features:

• Dense calories support rapid mass gains.
• Protein blend powers muscle recovery after tough sessions with steady amino acids.
• Creatine monohydrate supports ATP regeneration for stronger workouts, while a high carbohydrate blend replenishes glycogen stores to keep energy levels high through demanding training sessions.
• Glutamine and B vitamins support metabolic function and recovery after workouts.
• Quality is assured by GMP compliant facilities and NSF testing.

Optimum Nutrition Serious Mass blends whey concentrate, calcium caseinate and egg albumen with maltodextrin to deliver a dense, calorie rich shake. Trusted by athletes. The range is manufactured in NSF certified facilities, with third-party testing to verify purity. Creatine monohydrate supports strength, and glutamine plus B vitamins back recovery and metabolic function. Crafted to the highest standards, with a long standing history in sport nutrition, this mass gainer is built for serious training and steady progress. It also serves as a reliable protein powder for muscle gain, helping you reach your goals without compromise.