Optimum Nutrition Serious Mass Protein Powder 5.45kg
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BANANA
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CHOCOLATE PEANUT BUTTER
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CHOCOLATE
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CHOCOLATE MINT
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COOKIES & CREAM
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STRAWBERRY
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VANILLA
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PICK AND MIX 10+ INDIVIDUAL PRODUCTS FOR UP TO 15% OFF!
QUANTITY | DISCOUNT |
PICK&MIX 10+ | 5% OFF |
PICK&MIX 20+ | 10% OFF |
PICK&MIX 30+ | 15% OFF |
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
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



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
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


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The Serious Mass Gainer formula supports muscle growth and repair utilising 50-grams of quality whey protein blend and 256-grams of carbohydrates per serving to provide long-lasting energy and boost daily calorie intake. Fats and saturates are kept low to maintain a supreme macronutrient profile with just 4.7-grams within a 340-gram shake.
Produced by Optimum Nutrition, the large 5.45kg Serious Mass packs are easily resealable and come with 16 large servings to keep you fuelled throughout your busy day. Coming in six tasty flavours including the special edition, Chocolate Mint, there's something suited to everyone's tastebuds.
- 5450g = 16 servings
- 340g = 1 serving
Ingredients: Maltodextrin, WHEY Protein Concentrate [MILK], Calcium CASEINATE [MILK], Flavourings, Cookie Crumb (1.4%) (WHEAT Flour [GLUTEN], Sugar, Vegetable Fats: Palm, Rapeseed; Fat-Reduced Cocoa Powder, Sodium Chloride), Creatine Monohydrate, MILK Mineral Complex, Medium Chain Triglycerides [MILK], EGG Albumen, Dipotassium Phosphate, Sodium Chloride, Vitamin & Mineral Blend (Sodium L-Ascorbate, Ferric Pyrophosphate, D-Alpha-Tocopheryl Acetate, Nicotinamide, Zinc Oxide, Retinyl Acetate, Calcium D-Pantothenate, Sodium Fluoride, Manganese Sulphate, Potassium Iodate, Cyanocobalamin, D-Biotin, Chromium (III) Chloride, Pteroylmonoglutamic Acid, Cholecalciferol, Sodium Selenite, Cupric Citrate, Pyridoxine Hydrochloride, Thiamine Hydrochloride, Phylloquinone, Riboflavin, Sodium Molybdate), Glutamine Peptides [WHEAT GLUTEN], L-Glutamine, Magnesium Oxide, WHEY Powder [MILK], Inositol, L-Ascorbic Acid, Sweetener (Sucralose), Antioxidant (Tocopherol-Rich Extract), Calcium D-Pantothenate, Pteroylmonoglutamic Acid.
For allergens, see ingredients in uppercase.
The ingredients list and allergens are based on the Cookies and Cream Optimum Nutrition Serious Mass Gainer Protein Powder and can vary slightly depending on the flavour selected.
Regulated Name: Ready To Mix Powder with Protein, Carbohydrates, Vitamins, Minerals and Sweetener.
Typical Values Per | 340g | 100g |
Energy (Calories) | 1267kcal | 379kcal |
Fat | 4.7g | 1.4g |
Of Which Saturates | 1.8g | 0.5g |
Carbohydrate | 256g | 77g |
Of Which Sugars | 26g | 7.9g |
Protein | 50g | 15g |
Salt | 1.59g | 0.48g |
Creatine | 3g | 0.9g |
Vitamin A | 640μg | 192μg |
Vitamin D | 4μg | 1.2μg |
Vitamin E | 9mg | 2.7mg |
Vitamin K | 75μg | 22μg |
Vitamin C | 60mg | 18mg |
Vitamin B6 | 1.1mg | 0.3mg |
Vitamin B12 | 7.4μg | 2.2μg |
The nutritional information is based on the Banana Serious Mass Gainer Optimum Protein Powder and might vary slightly on other flavour variations.
For the best results, consume Optimum Nutrition Serious Mass shakes between meals when you need extra calories or after your workout to support your recovery.
Mix two heaped scoops with 710ml of water or milk then add a few ice cubes and, if desired, other calorie-contributing ingredients and blend well.
- Weight: 5450g-Grams
- Barcode: 5060245601061
- Production Country: United Kingdom
- Storage: Store protein in a cool, dry place away from direct sunlight
- Brand: Optimum Nutrition
- Type: Protein Powder
PICK AND MIX 10 = £53.19
PICK AND MIX 20 = £50.39
PICK AND MIX 30 = £47.59
With the Protein Package discount system, you can get up to 15% off your order when you pick and mix any ten or more products across the website!
The discount code will automatically be applied on the cart page, find out more or see the full pick and mix range.
Christmas Delivery: Our courier options have advised this year's estimated Christmas delivery cut-off will be Thursday 19th December at 4pm. Due to it being the busiest shipping time of the year and the cut-off not being a 100% guaranteed timeframe, we strongly advise all customers to try to order as early as possible in the week commencing December 16th in case of any unforeseen delivery delays in your area. This message supersedes any other timeframes stated on the website.
Christmas Dispatching: We will be dispatching orders as usual until Christmas Eve at 4pm and will resume normal service 2nd January 2025. We will be dispatching orders on December 30th to ease volumes when we return to normal on 2nd January 2025. Therefore, your order might be shipped earlier than expected but this can't be gauranteed. This message supersedes any other timeframes stated on the website.
We endevour to dispatch all UK orders on the same day as they are placed including weekend. Please be aware that during busy periods such as Christmas and Black Friday it may take longer to receive your order. Deliveries should be stress-free, that's why all of our services are fully trackable. Here are our current UK shipping rates:
Standard Delivery (Est. 2 - 3 working days)
- 0.0 kg - 2.0 kg : £2.99
- 2.0 kg - 10.0 kg : £3.99
- 10.0 kg - 60.0 kg : £4.99
Express Delivery (Est. 1-2 working days)
- 0.0 kg - 2.0 kg : £5.99
- 2.0 kg - 30.0 kg : £6.99
Delivery time frames are estimated and not guaranteed. Further information about our UK and international shipping services can be found here. All deliveries can be tracked by following the link in your shipping confirmation email. View our full shipping policy here.
Optimum Nutrition Serious Mass Protein Powder 2.72kg
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