Building serious muscle requires a consistent calorie surplus — you’ve got to take in more energy than you burn each day. For many people, eating enough food to reach that surplus can be tough, which is where Optimum Nutrition Serious Mass comes in. This powerful weight gainer is specifically designed to help you increase your calorie intake efficiently, delivering a massive 1,250 calories per serve, including 50 grams of protein and over 250 grams of carbohydrates to fuel size and strength gains.
Unlike many mass gainers, Serious Mass contains no added sugar. Instead, it’s fortified with creatine, glutamine, and a full spectrum of 20 essential vitamins and minerals, giving you nutrient-dense calories that support recovery and performance. Every shake provides the ideal balance of macros and micronutrients to help you grow.
Key benefits of Optimum Nutrition Serious Mass:
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Supports muscle growth and weight gain with 1,250 calories per serve
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50g of high-quality protein to assist muscle repair and maintenance
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250g+ of carbohydrates to restore glycogen and fuel intense workouts
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Enriched with creatine monohydrate for improved power and performance
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Includes 20 vitamins and minerals for overall nutritional support
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Great as a post-workout shake or between meals
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No added sugar
Who is it best suited for?
Serious Mass is ideal for athletes, lifters, or hard gainers who struggle to eat enough calories through regular meals. It’s especially effective for those training at high intensity or looking to break through weight-gain plateaus.
How and when to use it:
Blend two scoops with 700–720ml of cold water or milk for a rich, calorie-dense shake. For beginners, start with one scoop (half serve) to assess tolerance. You can enjoy it post-workout to kickstart recovery or between meals to top up your daily calorie goal.
Serious Mass by Optimum Nutrition gives you more than just calories—it provides the right nutritional foundation to help you build real size, strength, and performance.
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