Challenge your genetics. Build a monumental physique.

For some, gaining size is an uphill battle. Serious Mass by Optimum Nutrition is the heavy artillery designed to win that battle. If your metabolism is an oven that burns everything you eat, this is the strategic calorie surplus you need to force your body to grow, no excuses.

The Alchemy of Excellence:

• Guaranteed Surplus: Delivers a massive amount of calories in a delicious liquid format, allowing you to consume the equivalent of two solid meals in seconds.
• Strength Matrix: Powered with Creatine Monohydrate, L-Glutamine and Glutamic Acid so that size comes with real strength in the bar.
• Complete Nutrition: These aren't empty calories. It's fortified with 25 essential vitamins and minerals to ensure your body has the micronutrients needed to support this growth.

The Science of Size

A colossal formula delivering 1,250 calories and 50g of protein per serving. With over 250g of carbohydrates to replenish glycogen and creatine for explosive power.

Your Power Ritual

Mix 2 heaped scoops with 700ml of water or whole milk. Alchemist's Tip: If you're new, start with 1/2 serving (1 scoop) post-workout and gradually increase the dose as your body demands more size.