ON Serious Mass

Optimum Nutrition Serious Mass

Struggling to put on quality size, no matter how much you eat? When a fast metabolism works against your goals, Serious Mass by Optimum Nutrition is your ultimate weapon for size, strength, and recovery.

This premium weight-gainer delivers a massive 1,250 calories, 50 g of protein, and over 250 g of carbohydrates per serve — designed to fuel intense training and promote serious muscle growth. Perfect for athletes, lifters, and hard gainers who need extra calories without relying on junk food.

Key Benefits

• Supports lean muscle growth and recovery

• 1,250 calories and 50 g protein per serve

• Over 250 g complex carbohydrates for sustained energy

• Enhanced with creatine, glutamine, and 25 vitamins & minerals

• Great-tasting, easy-mix formula

Why Serious Mass Works

Each serve packs a high-value protein blend — including Whey Protein Concentrate, Calcium Caseinate, Egg Albumen, and Sweet Dairy Whey — to support muscle protein synthesis, recovery, and performance.

• Whey Protein Concentrate: Fast-digesting and rich in essential amino acids to kick-start muscle repair.

• Calcium Caseinate: Slow-release protein that helps reduce muscle breakdown and supports overnight recovery.

• Egg Albumen: Naturally packed with amino acids and micronutrients like folic acid, vitamins A & D, and B vitamins for muscle repair and overall health.

Enhanced with Creatine Monohydrate, Glutamine, Choline, and Inositol, this advanced formula supports anabolic activity, energy production, and recovery.

Whether you’re chasing your next personal best or just trying to fill out your frame, Optimum Nutrition Serious Mass delivers the fuel you need to train harder, recover faster, and grow bigger.