FREE UK delivery when you spend £20

Optimum Nutrition Serious Mass Chocolate Peanut Powder 2730g

2730 g  - £23.49 - In Stock

- +

£23.49 RRP £46.99 save £23.50

£0.86  /  100 g 016901


Delivery Options

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 **
See More
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 29.
Rated 4 out of 5 by from Decent Good taste , however most times require blender rather than shaking with hand and it’s a large portion
Date published: 2020-01-09
Rated 5 out of 5 by from Great taste doesnt make you sick Safest protein shake to get if you’re worrying about taste
Date published: 2020-01-06
Rated 5 out of 5 by from Weight gain I’ve gained so much weight all thanks to serious mass you just have to eat a lot at the same time as drinking this for the best results I was 37kg now I’m 48 nearly 50kg! Thank you serious mass ❤️
Date published: 2019-12-06
Rated 4 out of 5 by from Extra calories It’s good if you are looking to up your calorie intake. [This review was collected as part of a promotion.]
Date published: 2019-09-14
Rated 5 out of 5 by from Great Stuff Great Stuff, that really fills you up, and does help with muscle growth. [This review was collected as part of a promotion.]
Date published: 2019-08-12
Rated 5 out of 5 by from Excellent Doesn’t have any lumps and tastes like a milkshake [This review was collected as part of a promotion.]
Date published: 2019-08-10
Rated 5 out of 5 by from Great stuff, good value and works. From a typical ”No gainer” I find this product is excellent value for money. It works provided you stick to a decent nutritional plan. I use this at least 2 times a day maybe 3. As well as regular meals, don’t forget you can’t absorb more than maybe 25-30g protein in 1 sitting so don’t wast it, don’t consume more than that in 1 go. I also take Bcaa omega3 and creatine before and after training and stick to a Monday,Wednesday,Friday progressive overload weight training program. With all that I am finding I’m putting on good lean muscle finally, this product defiantly helps me do it, I simply couldn’t consume the required protein without it. It mixes well, not sure why some reviews say it doesn’t. I just chuck it in my bottle with some water and shake for 30 sec, not lumpy at all, ends up smooth. Banana and choc peanut both are actually pretty tasty also. 5/5 from me. [This review was collected as part of a promotion.]
Date published: 2019-08-05
Rated 4 out of 5 by from Mass Gainer Chocolate Peanut Powder Already made difference in one week and increased weight. The chocolate peanut powder is very sweet but does the job. [This review was collected as part of a promotion.]
Date published: 2019-07-30
  • y_2020, m_4, d_1, h_12
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.5
  • cp_1, bvpage1
  • co_hasreviews, tv_4, tr_25
  • loc_en_GB, sid_60016901, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_gnc-en_gb