Optimum Nutrition Serious Mass

• Achieve a calorie surplus fast with 1,250 calories per serving to support size and mass goals.
• Build and maintain muscle with 50 g of high-quality blended protein in every shake.
• Power intense training and recovery with 250 g of energy-rich carbohydrates.
• No added sugar and great-tasting flavours that mix smoothly for easy daily use.
• Versatile mass support—use between meals, post-workout, or before bed to keep calories consistent.

Optimum Nutrition Serious Mass – High-Calorie Mass Gainer for Hard Gainers

Struggling to put on size? Optimum Nutrition Serious Mass makes hitting your daily calorie target simple, delicious, and repeatable. If you’re a hard-gainer, a busy athlete, or anyone who needs extra calories without spending hours in the kitchen, this high-calorie mass gainer delivers the nutrition you need to grow—consistently.

Serious fuel for serious results

Each shake packs an impressive 1,250 calories with 50 g of blended protein to support muscle building, plus 250 g of carbohydrates to replenish energy and keep you training hard. And with no added sugar, you’re getting serious calories from purposeful nutrition, not empty sweetness.

Why athletes choose Serious Mass

• Made for hard-gainers: Easily hit a daily surplus without force-feeding meals.
• Balanced macros: Protein supports muscle growth while carbs restore glycogen after tough sessions.
• Convenient and consistent: A reliable shake you can take at home, at work, or after the gym.
• Trusted quality: From Optimum Nutrition—trusted by athletes worldwide for performance-focused formulas.
• Mix it your way: Blend with water or milk; add oats, nut butter, or fruit to tailor your calories.

Who is it for?

Hard-gainers, bulking athletes, and anyone with a fast metabolism who finds it tough to eat enough to grow. Serious Mass is ideal between meals, post-workout, or before bed to keep your calorie intake on track.

How to get the most from Serious Mass

• Start smart: New to mass gainers? Begin with half a serving and build up as your body adapts.
• Split your serving: Enjoy one half after training and the other half between meals for steady intake.
• Customise the shake: Milk for extra calories and creaminess; add oats or banana for a bigger boost.

Nutritional highlights

• 1,250 calories per serving
• 50 g protein to support muscle growth
• 250 g carbohydrates to fuel performance and recovery
• No added sugar

If you’re serious about size, get Serious Mass. It’s the easy, great-tasting way to stay in a calorie surplus and keep your progress moving forward.