FREE UK delivery when you spend £20

Optimum Nutrition Serious Mass Chocolate 2700g Powder

Low Prices

- +

£23.49 RRP £46.99 save £23.50

£0.87  /  100 g 076745


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 Serving (334g):)
Energy 1250kcal **
Protein 50g **
Total Carbohydrate 250g **
of which sugars 21g **
Total Fat 5g **
of which saturates 2g **
Dietary Fibre 3g **
Sodium 500mg **
Cholesterol 10mg **
Vitamin A 997IU **
Vitamin D 76IU **
Vitamin E 4.7IU **
Vitamin C 21.9mg **
Thiamin 0.5mg **
Riboflavin 0.6mg **
Niacin 6.7mg **
Vitamin B6 0.7mg **
Folic Acid 71.3µg **
Vitamin B12 0.5µg **
Biotin 100µg **
Pantothenic Acid 2.1mg **
Potassium 1395mg **
Calcium 350mg **
Phosphorus 165mg **
Magnesium 82.8mg **
Iron 4.2mg **
Zinc 2.7mg **
Copper 0.5mg **
Manganese 500µg **
Selenium 35µg **
Chromium 130µg **
Iodine 20.8µg **
Creatine Monohydrate 1g **
L-Glutamine 500mg **
Glutamine Peptides 500mg **
Choline 250mg **
Inositol 250mg **
See More
Product Info

Sometimes it can be just as hard to put on weight as it is to lose it.

Struggle to eat large amounts of food? Want to gain some serious muscle? There are many reasons why you may want to put on weight, and consuming more protein is one of the healthiest ways to do so.

A mistake a lot of people make when they want to gain muscle weight is starting to eat lots of junk and high-fat foods like takeaways, cakes, chocolate, etc. when what they really need is protein. This Optimum Nutrition Serious Mass powder is the ultimate weight gain formula. In each weight-gain shake, you get 1,250 calories and less than 5g of fat per serving. This includes 250g of carbohydrates and 50g of blended protein to support muscle growth.

The protein powder contains creatine which can improve your exercise routine. It also contains 25 vitamins and minerals including vitamin B12, magnesium, biotin, vitamin C and calcium, so it can also help support your micronutrient requirements.

How does protein help with weight gain?

You need to be consuming more calories than your body is burning to gain weight, and if that comes from protein then it makes it easier for your body to turn it into muscle. If you get more calories from carbohydrates or fat, your body will store it as fat instead.

How much protein do I need to gain muscle?

If you want to gain muscle, it is recommended that you consume 1.8g of protein for every kg you weigh. And do some weight training, of course!

What are the benefits of creatine?

Creatine is a firm gym-bunny favourite, known to boost athletic performance. It can increase energy levels in muscle cells, speed up muscle growth, and improve performance of high-intensity exercises.

How to enjoy Optimum Serious Mass Chocolate Protein Powder:

Simply mix 2 scoops of protein powder with water or your choice of milk then shake or stir until the powder is dissolved. Supercharge your Serious Mass shake by adding fresh or frozen fruits, nut butters, flaxseed, chia seeds, or other ingredients into the mix for even more of a calorie and protein hit.

Enjoy the protein shakes between meals, after your workout or before bed.


Add two heaped scoops 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.

Tips: Mixing two scoops of Serious Mass with 710 ml of non-fat or low fat milk instead of water will give you a thicker, creamier, higher-calorie shake. New users may find if beneficial to begin with 1/2 of a serving daily for the first week and then gradually increase to 1 or more full servings several times a day.

Serious Mass is a substantial weight-gain supplement that can be used to feed serious calorie needs in a variety of different ways.

Between Meals: Drink 1/2 - 1 serving of Serious Mass between meals to maintain positive nitrogen balance and support a high-calorie diet.

Post-Workout: Begin drinking 1/2-1 serving of Serious Mass 30-45 minutes following exercise to support maximum recovery.

Before Bed: Drink 1/2 - 1 serving of Serious Mass about 45-60 minutes before bed to provide nutrients to recovering muscle throughout the night.

Note: For best results use Serious Mass combined with intense weight training (3-5 times per week) and a sensible whole foods diet. Also, keep in mind that sufficient recovery between workouts impacts your ability to gain lean mass. Allowing at least 48 hours between workouts involving the same body parts is recommended.


Maltodextrin, Protein Blend (Whey Protein (Milk) Concentrate, Calcium Caseinate (Milk), Egg Albumen), Fat-Reduced Cocoa Powder, Natural and Artificial Flavours, Mineral Blend (di-Potassium Phosphate, Sodium Chloride, Ferric Pyrophosphate, Zinc Oxide, Copper Gluconate, Manganese Sulphate, Chromium Chloride Hexahydrate, Potassium Iodide), Medium Chain Tri-Glycerides, Vitamin Blend (Dextrose Monohydrate, Ascorbic Acid, Vitamin E Acetate, Niacinamide, Biotin, Vitamin A Acetate, D-Calcium Pantothenate, PyridoxineHydrochloride, Folic Acid, Cholecalciferol, Thiamine Hydrochloride, Riboflavin, Cobalamin), Sucralose.

For Allergens - See ingredients in bold.

May contain nuts and peanuts.

Advisory information:

Contains Milk, Soy, Egg, Wheat (Gluten).

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 Powder is rated 4.4 out of 5 by 115.
Rated 5 out of 5 by from Great taste This is by far the best tasting protein shake I’ve tried I ordered chocolate
Date published: 2020-02-26
Rated 5 out of 5 by from Protein powder. Excellent product. Tasty and protien packed. Easy to mix.
Date published: 2020-02-16
Rated 5 out of 5 by from Great taste Honestly wow, the amount of protein powders I've tried and nearly felt sick I almost gave up on looking. Luckily I picked this up at H&B while it was still on sale and at first I was skeptical but omg it's so nice!! I blend half a scoop with 3 scoops of vanilla ice cream and a little chocolate spread and tastes just like a milkshake. None of that grainy taste you'd normally find. As for weight I haven't taken it long enough to see a difference yet but will leave another review
Date published: 2020-02-10
Rated 4 out of 5 by from Good product Good for mixing and for getting carbs in which is a lot harder without the use of this shake
Date published: 2020-02-03
Rated 5 out of 5 by from Useful product but worry about the total fat Firstly, my friend used to ON's products a years ago and they suggested me to supply this gain mass milk to improve the resistance and weight. However, the "total fat" component seems to be a little bit higher than people don't use at least once. So with a 5g total fat, is it affect badly to my heart and blood vein ??
Date published: 2020-01-30
Rated 5 out of 5 by from My fev Its one of my fev protein , works for me thankssss
Date published: 2020-01-18
Rated 5 out of 5 by from Great taste The product is really very Good. The taste is delicious.
Date published: 2019-12-25
Rated 5 out of 5 by from 6th time buying purchased this like 5 times now with Great results! the results would be even greater if it wasn't for me smoking but all in all easy to drink with the flavor!helped me regain my body after losing muscle from sitting at home for days depressed. The only issue is the price because the scoops are decent sized which makes it run out quicker so u have to buy another one.
Date published: 2019-11-16
  • y_2020, m_4, d_1, h_12
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.5
  • cp_1, bvpage1
  • co_hasreviews, tv_15, tr_100
  • loc_en_GB, sid_60076745, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_gnc-en_gb