Serious Mass by Optimum Nutrition – High-Calorie Fuel for Serious Gains
When it comes to building muscle and size, consistent calorie intake is key — but getting enough from whole foods alone can be tough. Serious Mass by Optimum Nutrition makes it easier, delivering a calorie-dense, nutrient-rich shake designed to help you hit your growth goals.

Each serve packs 1250 calories, 50g of protein, and over 250g of carbohydrates, supporting muscle recovery, glycogen replenishment, and daily energy needs. Formulated with high-quality proteins, creatine monohydrate, glutamine, and 20 essential vitamins and minerals, Serious Mass is the ultimate solution for hard gainers and athletes chasing size and performance.

Key Benefits:

• 1250 calories per serve to support a daily calorie surplus

• 50g of high-quality protein for muscle repair and growth

• Over 250g of carbohydrates to restore glycogen and boost energy

• Includes creatine monohydrate for strength and performance

• Added glutamine and 20 vitamins & minerals for recovery and wellbeing

• No added sugar — clean fuel without unnecessary fillers

• Delicious flavours that mix easily with water or milk