Optimum Nutrition Serious Mass Protein

Optimum Nutrition Serious Mass is a high-calorie weight gainer specifically designed for individuals aiming to bulk up and build serious muscle mass. Each two‑scoop serving delivers approximately 1,250 kcal, including 50 g of high-quality blended protein, 250+ g of complex carbohydrates, and 5 g of creatine monohydrate, making it ideal for fueling intense workouts and supporting recovery.

This formula also provides 8 g of naturally-occurring glutamine, 11 g of BCAAs, and 24 g of essential amino acids, alongside 19–25 vitamins and minerals to support overall health and performance.

Key Features & Benefits:

• 1,250 kcal per serving to help achieve a calorie surplus necessary for muscle and weight gain
• 50 g of blended protein (whey concentrate, calcium caseinate, egg albumin) to support muscle building and recovery
• 250+ g complex carbs with no added sugar to fuel workouts and replenish glycogen
• 3–5 g creatine monohydrate to enhance strength, power, and performance
• 8 g naturally occurring glutamine, 11 g BCAAs, and 24 g EAAs to support recovery and protein synthesis
• Supply of 19–25 essential vitamins and minerals, including antioxidants and B‑vitamins for energy & immunity
• Trusted brand: banned-substance tested and recognized globally among elite strength athletes
• Mixes easily with water, milk, or in smoothies—with fruit and nut butter for extra calories and flavour