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Optimum Nutrition Serious Mass Chocolate Peanut Powder 2730g

2730 g  - £23.49 - In Stock

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£23.49 RRP £46.99 save £23.50

£0.86  /  100 g 016901


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Standard Delivery £1.99 or Free on orders over £20 - delivery within 2 days

Next Day Delivery £2.99 or Free on orders over £50 - order by 9pm

Collect from a local convenience shop for £1.99 or Free on orders over £30 - delivery within 4 days

Nutritional Info

Nutritional Information

Per 100g / 330g serving **
Energy (kJ) 1596kJ / 5266kJ **
Energy (kcal) 381kcal / 1259kcal **
Fat 1.6g / 5.3g **
Of which saturates 0.9g / 3.1g **
Carbohydrate 76g / 252g **
Of which sugars 7.8g / 252g **
Fibre 0.7g / 2.4g **
Protein 15g / 50g **
Salt 0.58g / 1.91g **
Vitamin A 91.7µg / 303µg **
Vitamin D 0.57µg / 1.9µg **
Vitamin E 1.1mg / 3.7mg **
Vitamin C 6.7mg / 22mg **
Thiamin 0.16mg / 0.52mg **
Riboflavin 0.19mg / 0.61mg **
Niacin 2.1mg / 6.9mg **
Vitamin B6 0.23mg / 0.74mg **
Folic Acid 21.7µg / 71.6µg **
Vitamin B12 0.14µg / 0.46µg **
Biotin 17µg / 55µg **
Pantothenic Acid 0.67mg / 2.2mg **
Potassium 414mg / 1360mg **
Chloride 335mg / 1110mg **
Calcium 123mg / 407mg **
Phosphorus 180mg / 596mg **
Magnesium 20.2mg / 66.6mg **
Iron 2.8mg / 9.2mg **
Zinc 1.2mg / 4.1mg **
Copper 0.26mg / 0.85mg **
Manganese 0.18mg / 0.59mg **
Selenium 3.3µg / 11µg **
Chromium 43µg / 140µg **
Iodine 15µg / 51µg **
Sodium 231mg / 763mg **
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Product Info

  • The ultimate weight gain formula
  • Add serious mass with 1,250 quality calories per shake
  • Each serving contains 50g of proteins to support muscle growth & 252g of carbs

Optimum Nutrition's Serious Mass is the ultimate weight gain formula. If you find it difficult to gain weight, Serious Mass will help you develop the physique you've always wanted!

Each delicious shake delivers an incredible 1,250 calories, but no added sugar. This includes 50g of blended protein to support muscle growth and 252g of carbohydrates.


Add 2 heaped scoops (330 g) of Serious Mass to a blender filled with 710 ml of water. Blend for 45-60 seconds. Then add a few ice cubes and, if desired, other calorie-contributing ingredients and blend for an additional 30-45 seconds. TIP: New users may find it beneficial to begin with ½ a serving daily for the first week and then gradually increase to 1 or more full servings several times a day.


Maltodextrin, Whey Protein Concentrate (milk), Calcium Caseinate (milk) (Emulsifier: Soy Lecithin), Fat-Reduced Cocoa Powder (2.3%), Flavouring, Minerals (Sodium Chloride, Dipotassium Phosphate, Ferric Pyrophosphate, Zinc Oxide, Cupric Gluconate, Manganese Sulphate, Chromium III Chloride Hexahydrate, Potassium Iodide), EGG Albumen, Medium Chain Triglycerides, Creatine Monohydrate, Choline Bitartrate, L-Glutamine, Glutamine Peptides [Wheat], Whey Powder (milk), Inositol, Vitamin Blend (L-Ascorbic Acid, Nicotinamide, DL-Alpha-Tocopheryl Acetate, Calcium D-Pantothenate, Pyridoxine Hydrochloride, Riboflavin, Thiamin Hydrochloride, Retinyl Acetate, Pteroylmonoglutamic Acid, D-Biotin, Cholecalciferol, Cyanocobalamin), Sweetener (Sucralose).

For allergens, see ingredients in bold.

Remember to:

We go to great efforts to ensure that the information on this page is accurate at the time that the page was last edited. As we are constantly reviewing and developing our products to meet our consumer needs, consumers, particularly those that suffer from allergies and intolerances, should always check product labelling, warnings, and directions provided with the product that is delivered, prior to use or consumption.

Customer Reviews
Optimum Nutrition Serious Mass Chocolate Peanut Powder is rated 4.7 out of 5 by 19.
Rated 4 out of 5 by from Great flavour and taste I’ve bought 4 of these now, all different tastes.. At first I was a little hesitant to try different flavours, because they are quite costly, but I risked it and I’m glad I did. My favourites are definitely chocolate, and peanut butter. They’re quite thick shakes, and are very filling. I bought them to try put on a little bit of weight, I haven’t noticed anything dramatic but these shakes help me with my energy levels. Whenever I don’t take them for a few days I can definitely tell the difference in my tiredness/energy levels. So not only do they help you consume more protein and put on healthy weight, they help with feeling fatigued. I would highly recommend to anyone who struggles with gaining weight and feeling fatigued. [This review was collected as part of a promotion.]
Date published: 2019-04-26
Rated 5 out of 5 by from Yh very nice tbf I bought this a month ago and am very happy with it indeed. Tastes fine. Can see gains [This review was collected as part of a promotion.]
Date published: 2019-04-25
Rated 5 out of 5 by from Great product This is my second purchase for my son's muscle building at gym. The product certainly works and taste is also good. [This review was collected as part of a promotion.]
Date published: 2019-04-22
Rated 5 out of 5 by from Great! Arrived so quickly, tastes quite nice and is helping me gain weight.
Date published: 2019-04-12
Rated 4 out of 5 by from Always a good product Whether you're working out or working hard, this product is loaded with carbs with a decent portion of protein to fuel the demands of the body. [This review was collected as part of a promotion.]
Date published: 2019-04-04
Rated 5 out of 5 by from Amazing I bought the Strawberry flavour and loved it so much thought I’d try this choc peanut. They both taste amazing, I prefer strawberry with water and the choc peanut with milk. The serving is 2 scoops but they are huge scoops so I do 1 scoop first thing and then another scoop after my workout around 9am. I can already see I’ve put weight (muscle) on and are really enjoying. Big plus I haven’t had any digestive/wind problems which I’ve suffered for for years on whey. Great product [This review was collected as part of a promotion.]
Date published: 2019-02-25
Rated 4 out of 5 by from Really good way to build mass This product tastes good not there best flavour but has helped my gain 5kg of weight in 3 months, really helps me bulk especially when i don't have time to cook big meals. [This review was collected as part of a promotion.]
Date published: 2019-02-09
Rated 4 out of 5 by from Great product/ build up of calories! I bought this to easily achieve a 3000 calorie intake each day. The make-up of the calories (macros) are impressive and have allowed me to put on good mass. The taste in all honesty is average/ bearable and is better refrigerated for half an hour once blended. [This review was collected as part of a promotion.]
Date published: 2019-02-07
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