

🚀 Elevate your muscle game with Serious Mass — because gains wait for no one!
Optimum Nutrition Serious Mass is a high-calorie mass gainer powder delivering 1250 calories, 50g protein, 250g carbs, and 3g creatine per serving. It contains 25 essential vitamins and minerals, less than 5g fat, and no added sugar, designed to support muscle growth, weight gain, and recovery for serious athletes and fitness enthusiasts. Available in six flavors and easy to mix, it’s a trusted formula for those committed to maximizing their performance and physique.














| - Saturates | 0.5 g |
| - Sugars | 7.8 g |
| ASIN | B000GIPJ02 |
| ASIN | B000GIPJ02 |
| Age Range Description | Adult |
| Best Sellers Rank | 1,028 in Health & Personal Care ( See Top 100 in Health & Personal Care ) 18 in Whey Nutrition Protein |
| Brand | Optimum Nutrition |
| Carbohydrate | 77 g |
| Country of origin | United Kingdom |
| Country of origin | United Kingdom |
| Customer Reviews | 4.4 4.4 out of 5 stars (30,489) |
| Customer reviews | 4.4 4.4 out of 5 stars (30,489) |
| Date First Available | 20 May 2009 |
| Energy (kcal) | 379.77 kcal |
| Fat | 1.4 g |
| Format | Powder |
| Is discontinued by manufacturer | Yes |
| Item model number | 1031920 |
| Manufacturer | OPTIG |
| Manufacturer contact | 4 Waterside, Dublin 24, Ireland |
| Product Dimensions | 29.21 x 13.97 x 40.64 cm; 5.44 kg |
| Protein | 15 g |
| Salt | 0.48 g |
| Serving Size | 100 g, 334 g |
| Storage Instructions | Store in a cool and dry place |
| Units | 5450.0 gram |
| Weight | 5.44 kg |
T**S
Good
It's helping me put on weight. I added a tablespoon of peanut butter and a banana, tastes really good with the strawberry one. This seems to be the best mass gainer, I've looked around and this is always said to be the best with approved ingredients. It is sweet tasting but if you add some peanut butter it will tone down the sweetness. I'm just doing pushups, ab crutches, planks and dumbbells. I don't go to a gym. With noticeable growth to my arms and chest, just started working on abs to balance it out. I only started to see results after drinking this stuff. Good price on this bigger bag so I think I'll get this one again in the future.
L**G
It’s a must buy ! Best & high quality mass gainer! Imo the best out there
I only use this brand of mass gainer… reason being it sits will in my digestive system, it definitely does what it supposed to do. I have used other brands, cheaper brands but they do not pack the punch this do 💪 I have literally been buying this for over 10 years now & will never use other cheaper products. Yes it’s expensive but quality costs money simple! It mix fairly well. The ingredients are of high quality. In my opinion you will not be disappointed & like I said you will definitely be getting the performance you want. I packed on good quality weight… 2st in 3 months but that’s training 5 days a week keeping meals healthy. Hope you find this review helpful.
B**N
Excellent for Weight and Mass Gain
This protein powder is an excellent for anyone serious about gaining mass. The large size offers fantastic value, and the mix is effective and potent. It mixes well, taste good and is essential for hitting those high-calorie and high-protein goals. Highly recommended for fast, reliable results!
A**L
Eh not amazing
Tastes actually quite nice for a mass gainer, MASSIVE scoop so won’t fit for loads of shaker bottles. Also can still be slightly clumpy without a blender but not too bad.
S**S
STRUGGLE TO EAT
I don’t use this protein for the gym I use it cos I struggle to eat normal food and so this sometimes becomes my only source of food and with 1250 calories per shake I know if I drink 2 a day I’ll get all the nutrients I need infact probably more then I’d get from everyday food, I’ve tried loads of different powders and this is by far the best one for taste , filling me up and keeps me looking well, ITS WELL WORTH THE MONEY IF LIKE ME YOU STRUGGLE TO EAT!!!?
J**O
Effective product for underweight people
I've always been slim/athletic but after a serious illness I went under nine stone and stayed there (I'm five foot ten). I have a fast metabolism and eating the required amount of food to healthily gain weight was extremely difficult to sustain. I tried eating junky high calorie snacks but realised it was a stupid way of trying to gain weight. So after buying this product I went straight in and tried to drink a full serving - mistake! I managed it but felt quite ill afterwards. I highly recommend you start with half or even a quarter serving to begin with, just until your stomach adapts. It's now two weeks later and with trial and error I've found that splitting a full serving into three is best for me. One in the morning, one after lunch, one in the evening. I use full fat milk, ice cream and a banana to boost the calories per full serving to over 2000, and I find a blender works great to give a nice semi-thick smooth shake. When I started a fortnight ago I weighed 8 stone 12, I now weight 9 stone 8, so I've gained roughly 10 pounds in two weeks, with fluctuations along the way. I've just bought another 5.4kg bag and plan to continue to steadily gain until I reach around 11 stone. I bought some weights and with some advice I've started a light exercise programme with the aim of turning the energy to muscle and shaping my body a bit. I have more modest aims than many who take this supplement, I'm not looking to build huge muscles and train super hard, but if you're like me - underweight and a bit unfit - then I recommend this product along with some sort of exercise programme so it doesn't just go straight to your belly. It really does promote weight gain, I've been very pleasantly surprised with the results, and will continue to use the product as needed in order to achieve and maintain my target weight. The chocolate flavour is very pleasant, if a little sweet, and I now have no problem ingesting what I need to in order to gain weight. It may seem expensive, but at £2.50 a day it works out an easy, reliable and cost effective way to supplement your diet without resorting to less healthy alternatives. It works for skinny old me, and I don't see any reason why it shouldn't work for skinny old you! :) Edit - it's now 22 days after I first used the product and I'm now just over ten stone, so that's 16lb in 22 days. People are commenting on the difference and it's done wonders for my energy levels and appetite. So all in all I can't recommend this product any more highly, it genuinely works. Can't say fairer than that! Last update - I'm now at my target weight of 11st, it's taken 54 days for me to put on 30lbs - two stone two pounds in just under two months. That's beyond what I expected. If I could give a final note it would be to watch your body fat as without exercise this product will raise it quite easily. I'm now going to reduce my servings to maintain this weight, with my new increased appetite it's possible that I soon won't need a supplement at all. So that's me signing off, a bit heavier and a lot happier!
N**H
Good
M**D
منتج ممتازة وخدمة ممتازة من البائع ظهر الفرق خلال 3 أيام مع التمرين بس للتوضيح اهم حاجة الاستمرار
K**N
Very good protein
K**A
Ich bin sehr zufrieden mit dem Optimum Nutrition Serious Mass hochkalorischen Proteinpulver. Ich benutze es immer wieder und habe festgestellt, dass es mir am besten hilft, meine Masseaufbauziele zu erreichen. Ich habe auch andere Marken ausprobiert, aber keine hatte den gleichen Effekt wie Optimum Nutrition. Der Geschmack ist angenehm und es lässt sich gut mischen. Insgesamt ein großartiges Produkt für alle, die ernsthaft Masse aufbauen möchten.
N**S
Not only is this an Amazon a quality amount of protein, but it tastes so good! Usually, protein shakes taste worst than anything else but the STRAWBERRY flavor is fantastic (all other flavors like chocolate and peanut butter are absolute dog poop) you cannot go wrong with strawberry. At first, if you’re first starting to work out, you might have some stomach issues, but you have to very slowly increase the amount and your body will get used to it. I ONLY use one scoop because two is ridiculously too much and I don’t want to end up with liver or kidney failure lol but one scoop is good. Once you get used to it, no stomach issues at all! Very effective, I have gotten so many compliments from others who have been at the gym for longer and ache for my results. You must remain consistent with the gym and workouts, do very intense workouts. If you don’t, then you’ll just get fat from this lol I advise to only use one scoop size to make the bag last longer and prevent any health issues, two scoops is ridiculously too much. Be consistent and you can play with some mix ability and throw banana or some other fruits if you want. I would recommend and will continue to buy this after so many years of already doing so
Trustpilot
1 day ago
1 week ago