Optimum Nutrition
:
Serious Mass
Weight Gainer
Details
https://www.predatornutrition.com/weight-gainers/optimum-nutrition/OPT1025%2F316%2F1079.htmlGoal: Build Muscle
- Over 1,200 calories in a serving
- High carbohydrate formula is perfect for the chronically underweight
- Protein blend ensures sustained delivery of protein throughout the day
- Easy to digest formula means you can consume more calories through the day compared to a gainer featuring complex carbs
- Can be used as a post-workout as well as every day use as a weight gainer
- Creatine and glutamine enhance strength, endurance and recovery from exercise
- Includes a vitamin and mineral blend to support general health
Price per serving: £3.37
Promotions
Buy Gold Standard Whey 2.27kg or Serious Mass 5.45kg and the below for FREE:
- Optimum Nutrition Shaker Bottle 600ml
- Optimum Nutrition Gym Towel
Product Actions
UK Shipping
We offer FREE DELIVERY to UK for orders worth £50 or more and these are shipped using the 4-5 Day Delivery service. We also offer Free Next Working Day delivery with Hermes (on orders of £100). For SAME DAY DISPATCH, you need to place your order before 5PM GMT otherwise your order will be dispatched the following working day.
Service | Price | Notes |
FREE FedEx Tracked Economy DELIVERY | £0.00 | On orders over £50. |
FREE Hermes Tracked DELIVERY | £0.00 | On orders over £75. |
STANDARD DELIVERY | £2.79 | On orders below £50. |
Hermes NEXT WORKING DAY | £3.99 | Free on orders over £100. *Excluding Northern Ireland, The Scottish Highlands & Islands |
DPD NEXT WORKING DAY | £5.99 | *Excluding Northern Ireland, The Scottish Highlands & Islands |
DPD SATURDAY DELIVERY | £7.99 | *Excluding Northern Ireland, The Scottish Highlands & Islands |
International Shipping
Please Note: Free shipping applies to the first parcel only. A surcharge payment may be required If your order needs to be shipped in multiple parcels.
Country | Price | Free Shipping |
Austria | £8.99 | Free on orders over £200 |
Australia | £9.99 *** | Free on orders over £200 (under 1kg) ** |
Belgium | £6.99 | Free on orders over £150 |
Bosnia | £19.99 | Free on orders over £260 |
Bulgaria | £11.99 | Free on orders over £250 |
Canada | £10.99 *** | Orders over £200 (under 1kg) ** |
Croatia | £9.99 | Free on orders over £250 |
Cyprus | £13.99** | Doesn't qualify for free shipping |
Czech Republic | £9.99 | Free on orders over £200 |
Denmark | £6.99 | Free on orders over £150 |
Estonia | £11.99** | Free on orders over £250 |
Finland | £9.99 | Free on orders over £200 |
France | £6.99 | Free on orders over £150 |
Germany | £4.99 | Free on orders over £150 |
Greece | £9.99** | Free on orders over £250 |
Hungary | £8.99 | Free on orders over £200 |
Iceland | £9.99-£21.99 | Doesn't qualify for free shipping |
India | £16.99 *** | Doesn’t qualify for free shipping |
Indonesia | £21.99 *** | Doesn’t qualify for free shipping |
Israel | £12.99 * | Doesn’t qualify for free shipping |
Italy | £7.99 | Free on orders over £150 |
Japan | £12.99 * | Doesn’t qualify for free shipping |
Kuwait | £12.99 * | Doesn’t qualify for free shipping |
Latvia | £7.99 | Free on orders over £200 |
Lithuania | £8.99 | Free on orders over £200 |
Luxembourg | £8.99 | Free on orders over £200 |
Malta | £14.99** | Doesn’t qualify for free shipping |
Netherlands | £5.99 | Free on orders over £150 |
New Zealand | £12.99 * | Doesn’t qualify for free shipping |
Norway | £8.99*** | Free on orders over £210 |
Poland | £9.99 | Free on orders over £200 |
Portugal | £5.99 | Free on orders over £150 |
Qatar | £15.99 | Doesn’t qualify for free shipping |
Ireland | £5.99 | Free on orders over £150 |
Romania | £9.99 | Free on orders over £200 |
Saudi Arabia | £9.99 * | Doesn’t qualify for free shipping |
Serbia | £15.99 | Free on orders over £260 |
Singapore | £12.99 * | Doesn’t qualify for free shipping |
Slovakia | £9.99 | Free on orders over £200 |
Slovenia | £9.99 | Free on orders over £200 |
Spain | £6.99 | Free on orders over £150 |
Spain - Baleares | £9.99** | Doesn’t qualify for free shipping |
Spain - Canary Islands | £15.99*** | Doesn’t qualify for free shipping |
Sweden | £8.99 | Free on orders over £200 |
Switzerland | £8.99*** | Free on orders over £200 |
United Arab Emirates | £12.99 * | Doesn’t qualify for free shipping |
USA | £7.99 * | Free on orders over £135 (under 2kg) ** |
* Parcels over the weight of 2kg will be charged depending on the weight of the parcel.
** Parcels over the weight of 2kg will not qualify for FREE SHIPPING and therefore will be charged depending on the weight of the parcel.
*** Parcels over the weight of 1kg will be charged depending on the weight of the parcel.
Optimum Nutrition Serious Mass ingredients & nutrition facts
Serious Mass 12lb/5.4kg - Chocolate | ||||||
Serving Size: 2 Scoops (334g) | ||||||
Servings Per Container: 16 | ||||||
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Ingredients: Maltodextrin, Protein Blend (Whey Protein Concentrate*, Calcium Caseinate*, Egg Albumen), Fat-Reduced Cocoa Powder, Flavorings, Mineral Blend (Di-Potassium Phosphate, Sodium Chloride, Ferric Pryophosphate, Zinc Oxide, Copper Gluconate, Manganese Sulfate, Chromium Chloride Hexahydrate, Potassium Iodide), Medium Chain Triglycerides, Creatine Monohydrate, Choline Bitartrate, L-Glutamine, Glutamine Peptides, Whey Powder*, Inositol, Vitamin Blend (Dextrose Monohydrate, Ascorbic Acid, Vitamin E Acetate, Niacinamide, Biotin, Vitamin A Acetate, Calcium D Pantothenate, Pyridoxine Hydrochloride, Folic Acid, Cholecalciferol, Thiamin Hydrochloride, Riboflavin, Cobalamin), Sweetener (Sucralose). * From Milk | ||||||
Contains Milk, Egg, Wheat (Gluten) |
Serious Mass dosage & how to use
Take up to 3 servings of Serious Mass daily. Simply mix up 2 scoops with milk or water in your ON shaker and enjoy between meals, post-workout and/or before bed.Product Guide
Why
Serious Mass is a high calorie weight gainer which should be used only by someone seeking rapid weight gains. The high ratio of carbohydrates means that it supplies a lot of energy but that comes with the caveat that if you do not train frequently it will not be a good choice for you. On the other hand for people performing a lot of cardio or with superfast metabolisms, Serious Mass supplies calories in an easily digestible form to make weight gain easy.
When
Serious Mass protein powder should be reserved for phases where you are trying to gain weight quickly and are happy to accept a modicum of fat gain. Outside of bulking phases those who perform high amounts of cardiovascular activity (which depletes carbohydrates more than weight training) will find this a good post-workout choice.
Who
Serious Mass is a gainer which should be used with caution if you are seeking lean mass gains as the overwhelming number of calories and carbs means that unless you are naturally very skinny you may end up gaining too much fat. On the other hand for the kind of person who claims they can never gain weight no matter how much they eat, Serious Mass protein shakes will be perfect.
Predator Nutrition Serious Mass Review
Optimum Nutrition Serious Mass Gainer 5.4kg (12lb) or 2.72kg (6lb) is a phenomenally popular weight gainer and Optimum's signature product when it comes to addressing the needs of bodybuilders who struggle to gain weight.
Why Buy Serious Mass Gainer?
Serious Mass weight gainer is packed full of carbohdyrates to fuel energy requirements, although the source of them, maltodextrin, may raise eyebrows in the quarters where a low GI carb source is preferred. We disagree because for weight gain maltodextrin will lead to faster gastric emptying which will allow for greater overall calorie intake. Using oats, or similar carbohydrate sources would actually make you feel full faster - the last thing needed for the chronically underweight. It is odd to see some people recommend weight gainers based around oats when oats are also recommended to dieters because they keeo you full for longer!
Time-Released Protein Blend
Serious Mass uses a blend of protein sources including whey and milk protein which is ideal for providing a balanced amino acid profile featuring two protein which release at different rates to the body thereby helping to sustain blood amino acid levels at an elevated level helping prevent a situation where your body sacrifices your own muscle for energy.
Safeguards Health
Rapid weight gain sometimes comes at the expense of a healthy diet so Serious Mass includes a combination of fibre to help aid digestion and a vitamin and mineral blend to ensure that users relying heavily on Serious Mass do not shortchange themselves when it comes to ingesting an adequate amount of micronutrients that support better health.
Enhanced Performance and Recovery
While weight gain is all about eating more calories per day than you break down you still need to gain strength in the gym to ensure that the weight you gain is predominantly muscle. Serious Mass Gainer includes creatine monohydrate, a natural compound found in trace amounts in red meat which has been the subject of hundreds of peer-reviewed studies showing it can increase performance and build muscle. Optimum Nutrition mass gainer adds in the recovery catalyst glutamine as well as the neurotransmitters choline and inositol which can help with nerve function and cognitive health.
Flavours
Serious Mass flavours for sale in our shop.
- Chocolate Peanut Butter
- Banana Cream
- Cookies & Cream
- Chocolate
- Chocolate Mint
- Strawberry
- Vanilla
*Some packaging may vary whilst new packaging phased in, this does not affect product shelf life.
Put on 8kg of muscle thanks to 2 of these shakes a day in just 1.5 months and I'm an ectomorph so thanks to these guys
Really good product and happy with my order. Cheap price too compared to other websites.
Cookies and cream by optimum nutrition is by far the best mass gainer I’ve used the taste is unbelievable great nothing else I’ve used compares to this gainer. I also add milk and fruits aswell to get extra calories and vitamins and comes out very nice not very thick also which most gainers turn very think. Love this gainer my number 1 gainer to turn to that shows results very quickly.
I think the product is very good considering the price. I' use it and it works very well with me in weight gain side. Good Product with what's included
I received this gainer in time and I really liked it! It helps a lot to gain weight when you put the right level of intensity into your workouts!
Serious mass is one of the best gainers I have tried. It tastes great, mixes well and is a great price for a 5kg bag - highly recommend.
Best Weight Gainer. Amazing Size Gains. It has everything you need to put on mass. Great Carbs to Protein ratio and mixes easy with great taste. Chocolate is the best.
My mate told me about this and wasn’t sure at first but it actually does help me gain weight and increase my strength.
This was one nutritional mass gainer that’s shows results in the first week on your body and improvement in performance.
Good product but doesn’t shake up well, leaves clumps but if I put it in the nutri bullet it’s lovely, really nice taste.
the best product for masive mass
Great for getting more protein & calories in throughout the day. Recommend this with milk rather than water.
Really nice weight gainer.. Ive ordered the banana flavor and tastes like a real milkshake... easy blend to use in a shaker bottle. i only take a scoop and a half twice a day and put on a stone in weight withing 3 weeks with the 2.5kg tub .. just ordered another 5kg bag.
Doing two scoops straight off the back twice a day with regular meals is definatly not for the weak. I started off 1 scoop just once a day with regular meals then upped it. Now one shake mid morning after breakfast and one before bed.. it does was it says you just have to stay on it!
My usual go to weight gainer
Best tasting and value for money protein mass gainer you can buy.
For anyone looking to get big fast Serious Mass is well worth a look. Compared to a lot of gainers it is pretty easy on the old stomach but just be careful of using this if you are predisposed to getting fat because it is VERY HIGH in calories!
Serious mass is a weight gainer which because it's so high in carbs makes it best suited for those with great glucose tolerance or who are seriously underweight. While I added good mass on it, I found it best used at half doses as otherwise the carbs became overwhelming so I ended up adding a little protein to bump up protein and reduce the sickly feeling from too many carbs. Serious mass is probably better for people who have higher training demands than me!
I have used some products in my time but this is just cheap muck. Taste is awful, doesn't mix properly and is basically just a heavy amount of maltodextrin. I'll stick with my usual gainer.
I was looking for a while for a low sugar weight gainer at a good price and since I found Serious Mass and it ticks all the boxes I will stick with this for a while now. Tastes good, mixes up ok and lots of calories for gaining weight quickly.
Tried this after the lads in the gym recommended I change my diet. Within 6 weeks of taking it I noticed much bigger gains than with any other products.
I really liked this product, it has a high calorie counts (of which many are carb sourced) and I found the protein content (50g) to be to my liking. Also this is packed with bcaa's and glutamine and creatine (although I would supplement this with extra creatine as the content is low). Ingredients 10/10 Flavour and MixabilitynI enjoyed the banana flavour but found the vanilla a bit too rich and sweet. Mixed fine. ValuenI managed to put on good quality with this product and it's relatively cheap considering most protein retails at double this price for the size. Overall: 9/10

Predator Review
Predator Nutrition Serious Mass Review
Optimum Nutrition Serious Mass Gainer 5.4kg (12lb) or 2.72kg (6lb) is a phenomenally popular weight gainer and Optimum's signature product when it comes to addressing the needs of bodybuilders who struggle to gain weight.
Why Buy Serious Mass Gainer?
Serious Mass weight gainer is packed full of carbohdyrates to fuel energy requirements, although the source of them, maltodextrin, may raise eyebrows in the quarters where a low GI carb source is preferred. We disagree because for weight gain maltodextrin will lead to faster gastric emptying which will allow for greater overall calorie intake. Using oats, or similar carbohydrate sources would actually make you feel full faster - the last thing needed for the chronically underweight. It is odd to see some people recommend weight gainers based around oats when oats are also recommended to dieters because they keeo you full for longer!
Time-Released Protein Blend
Serious Mass uses a blend of protein sources including whey and milk protein which is ideal for providing a balanced amino acid profile featuring two protein which release at different rates to the body thereby helping to sustain blood amino acid levels at an elevated level helping prevent a situation where your body sacrifices your own muscle for energy.
Safeguards Health
Rapid weight gain sometimes comes at the expense of a healthy diet so Serious Mass includes a combination of fibre to help aid digestion and a vitamin and mineral blend to ensure that users relying heavily on Serious Mass do not shortchange themselves when it comes to ingesting an adequate amount of micronutrients that support better health.
Enhanced Performance and Recovery
While weight gain is all about eating more calories per day than you break down you still need to gain strength in the gym to ensure that the weight you gain is predominantly muscle. Serious Mass Gainer includes creatine monohydrate, a natural compound found in trace amounts in red meat which has been the subject of hundreds of peer-reviewed studies showing it can increase performance and build muscle. Optimum Nutrition mass gainer adds in the recovery catalyst glutamine as well as the neurotransmitters choline and inositol which can help with nerve function and cognitive health.
Flavours
Serious Mass flavours for sale in our shop.
- Chocolate Peanut Butter
- Banana Cream
- Cookies & Cream
- Chocolate
- Chocolate Mint
- Strawberry
- Vanilla
*Some packaging may vary whilst new packaging phased in, this does not affect product shelf life.
Customer Reviews
Put on 8kg of muscle thanks to 2 of these shakes a day in just 1.5 months and I'm an ectomorph so thanks to these guys
Really good product and happy with my order. Cheap price too compared to other websites.
Cookies and cream by optimum nutrition is by far the best mass gainer I’ve used the taste is unbelievable great nothing else I’ve used compares to this gainer. I also add milk and fruits aswell to get extra calories and vitamins and comes out very nice not very thick also which most gainers turn very think. Love this gainer my number 1 gainer to turn to that shows results very quickly.
I think the product is very good considering the price. I' use it and it works very well with me in weight gain side. Good Product with what's included
I received this gainer in time and I really liked it! It helps a lot to gain weight when you put the right level of intensity into your workouts!
Serious mass is one of the best gainers I have tried. It tastes great, mixes well and is a great price for a 5kg bag - highly recommend.
Best Weight Gainer. Amazing Size Gains. It has everything you need to put on mass. Great Carbs to Protein ratio and mixes easy with great taste. Chocolate is the best.
My mate told me about this and wasn’t sure at first but it actually does help me gain weight and increase my strength.
This was one nutritional mass gainer that’s shows results in the first week on your body and improvement in performance.
Good product but doesn’t shake up well, leaves clumps but if I put it in the nutri bullet it’s lovely, really nice taste.
the best product for masive mass
Great for getting more protein & calories in throughout the day. Recommend this with milk rather than water.
Really nice weight gainer.. Ive ordered the banana flavor and tastes like a real milkshake... easy blend to use in a shaker bottle. i only take a scoop and a half twice a day and put on a stone in weight withing 3 weeks with the 2.5kg tub .. just ordered another 5kg bag.
Doing two scoops straight off the back twice a day with regular meals is definatly not for the weak. I started off 1 scoop just once a day with regular meals then upped it. Now one shake mid morning after breakfast and one before bed.. it does was it says you just have to stay on it!
My usual go to weight gainer
Best tasting and value for money protein mass gainer you can buy.
For anyone looking to get big fast Serious Mass is well worth a look. Compared to a lot of gainers it is pretty easy on the old stomach but just be careful of using this if you are predisposed to getting fat because it is VERY HIGH in calories!
Serious mass is a weight gainer which because it's so high in carbs makes it best suited for those with great glucose tolerance or who are seriously underweight. While I added good mass on it, I found it best used at half doses as otherwise the carbs became overwhelming so I ended up adding a little protein to bump up protein and reduce the sickly feeling from too many carbs. Serious mass is probably better for people who have higher training demands than me!
I have used some products in my time but this is just cheap muck. Taste is awful, doesn't mix properly and is basically just a heavy amount of maltodextrin. I'll stick with my usual gainer.
I was looking for a while for a low sugar weight gainer at a good price and since I found Serious Mass and it ticks all the boxes I will stick with this for a while now. Tastes good, mixes up ok and lots of calories for gaining weight quickly.
Tried this after the lads in the gym recommended I change my diet. Within 6 weeks of taking it I noticed much bigger gains than with any other products.
I really liked this product, it has a high calorie counts (of which many are carb sourced) and I found the protein content (50g) to be to my liking. Also this is packed with bcaa's and glutamine and creatine (although I would supplement this with extra creatine as the content is low). Ingredients 10/10 Flavour and MixabilitynI enjoyed the banana flavour but found the vanilla a bit too rich and sweet. Mixed fine. ValuenI managed to put on good quality with this product and it's relatively cheap considering most protein retails at double this price for the size. Overall: 9/10
Nutrition
Optimum Nutrition Serious Mass ingredients & nutrition facts
Serious Mass 12lb/5.4kg - Chocolate | ||||||
Serving Size: 2 Scoops (334g) | ||||||
Servings Per Container: 16 | ||||||
Amount Per Serving | ||||||
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Ingredients: Maltodextrin, Protein Blend (Whey Protein Concentrate*, Calcium Caseinate*, Egg Albumen), Fat-Reduced Cocoa Powder, Flavorings, Mineral Blend (Di-Potassium Phosphate, Sodium Chloride, Ferric Pryophosphate, Zinc Oxide, Copper Gluconate, Manganese Sulfate, Chromium Chloride Hexahydrate, Potassium Iodide), Medium Chain Triglycerides, Creatine Monohydrate, Choline Bitartrate, L-Glutamine, Glutamine Peptides, Whey Powder*, Inositol, Vitamin Blend (Dextrose Monohydrate, Ascorbic Acid, Vitamin E Acetate, Niacinamide, Biotin, Vitamin A Acetate, Calcium D Pantothenate, Pyridoxine Hydrochloride, Folic Acid, Cholecalciferol, Thiamin Hydrochloride, Riboflavin, Cobalamin), Sweetener (Sucralose). * From Milk | ||||||
Contains Milk, Egg, Wheat (Gluten) |