Optimum Nutrition Serious Mass – Advanced Weight Gain Support. Take your muscle-building journey to the next level with Serious Mass by Optimum Nutrition—the ultimate high-calorie mass gainer for those who struggle to get enough calories and protein from food alone. Whether you're training intensely, have a fast metabolism, or simply need extra fuel to grow, Serious Mass delivers everything you need to bulk up and recover fast.

Why You’ll Love It

• 1,250 calories per serve to help maintain a calorie surplus
• 50g of blended protein to support muscle growth and repair
• 252–254g of carbohydrates (no added sugar) to fuel training and restore glycogen
• 3g Creatine Monohydrate to support strength, power, and muscle size
• Enriched with 20 essential vitamins and minerals, plus added L-Glutamine
• Great taste and easy to mix into shakes or smoothies
• Perfect for post-workout or between meals to keep your calorie intake on track

How to Use

• Mix 2 scoops with 700–720ml of water or milk using a blender
• Add fruits, nut butters, or oats for extra calories and flavour
• New to mass gainers? Start with 1 scoop to assess tolerance
• Use post-workout and/or between meals to boost daily intake

Who It’s For
Ideal for hard gainers, athletes, or anyone struggling to gain weight and muscle mass despite a balanced diet. Whether you're chasing size, strength, or improved performance, Serious Mass provides the fuel to help you succeed.

Key Product Details

• Calories: 1,250 per serve
• Protein: 50g blended protein
• Carbohydrates: 252–254g with no added sugar
• Creatine: 3g per serve
• Vitamins & Minerals: 20+ essential micronutrients
• Serving Size: 2 scoops (334g)

Go beyond limits and fuel your muscle growth with Optimum Nutrition Serious Mass—the smart choice for serious gains.