Optimum Nutrition Serious Mass is a high-calorie mass-gainer powder designed to help increase daily calorie and protein intake alongside training. This listing is the 2.73kg / 8-serving format in Strawberry, Cookies & Cream and Banana.
Per full serving: over 1,250 kcal, 50g protein, around 250g carbohydrates and 3g creatine, plus 25 vitamins and minerals. Exact nutrition varies slightly by flavour.
Suggested use: mix 2 heaped scoops with approximately 710ml water or milk. Suitable post-workout or between meals when additional calories are required.
Ingredients & allergens: formulation includes maltodextrin, whey protein concentrate (milk), calcium caseinate (milk), creatine monohydrate and flavour-specific ingredients, with egg albumen and wheat-derived glutamine peptides present in applicable UK formulations. Always check the individual flavour pack before use because ingredients and allergen details can vary by flavour.
Size: 2.73kg Servings: 8 Brand: Optimum Nutrition
Serving Information
Container size: 2.73 kg. Serving size: 2 heaped scoops, approximately 335–336 g depending on flavour. Approximately 8 full servings per 2.73 kg bag.
Nutritional Information Per Serving
Values vary slightly by flavour. Strawberry per 335 g serving: 5269 kJ / 1259 kcal; Fat 6.2 g, Saturates 3.4 g; Carbohydrate 250 g, Sugars 12 g; Protein 50 g; Salt 1.88 g; Creatine 3.0 g. Cookies & Cream per 336 g serving: 5292 kJ / 1265 kcal; Fat 6.9 g, Saturates 4.0 g; Carbohydrate 250 g, Sugars 12 g; Protein 50 g; Salt 1.48 g; Creatine 3.0 g. Banana also provides approximately 1,250 kcal, 50 g protein, over 250 g carbohydrate and 3 g creatine per serving.
Ingredients
Core formula across flavours: Corn Maltodextrin, Whey Protein Concentrate (Milk), Emulsifier (Lecithins, contains Soy), Flavourings, Creatine Monohydrate, Milk Mineral Complex, Minerals, Vitamins, Salt, Stabilisers (Cellulose Gum, Guar Gum, Carrageenan), Sweetener (Sucralose). Flavour-specific additions vary: Strawberry includes beetroot concentrate; Cookies & Cream includes cookie crumb containing wheat. Check the selected flavour label for its exact ingredient list.
Recommended Use
Add 2 heaped scoops to 710 ml of water and blend for 30–45 seconds. It can also be added to smoothies, porridge or other foods to increase calorie and protein intake.
Jul 28, 2026Precision Performance Labs
Jul 20, 2026
