

🚀 Serious Mass, Serious Gains — Don’t just train, transform.
Optimum Nutrition Serious Mass is a high-calorie mass gainer protein powder designed for athletes and fitness enthusiasts aiming for rapid muscle growth and weight gain. Each serving delivers over 1250 calories, 50g of protein, 250g of carbs, and 3g of creatine monohydrate, enriched with 25 essential vitamins and minerals. Available in six delicious flavors, it supports muscle recovery, performance, and sustained energy, making it an ideal post-workout or between-meal supplement for serious results.














| ASIN | B0015R36XU |
| Age Range Description | Adult |
| Benefits | Weight Gain |
| Best Sellers Rank | 508 in Health & Personal Care ( See Top 100 in Health & Personal Care ) 27 in Whey Nutrition Protein |
| Brand | Optimum Nutrition |
| Brand Name | Optimum Nutrition |
| Country Of Origin | United Kingdom |
| Customer Reviews | 4.5 out of 5 stars 42,870 Reviews |
| Diet Type | Vegetarian |
| Diet type | Vegetarian |
| Flavour | Strawberry |
| Global Trade Identification Number | 00748927023015 |
| Item Dimensions | 20.3 x 20.3 x 25.7 centimetres |
| Item Weight | 2.72 kg |
| Item weight | 2.72 kg |
| Manufacturer | OPTIG |
| Manufacturer Contact Information | 4 Waterside, Dublin 24, Ireland |
| Material Type Free | Sugar Free |
| Net Content Volume | 11.91 Litres |
| Number of Items | 1 |
| Package Type Name | Tub |
| Recommended Uses For Product | Post-Workout, Pre-Workout |
| Servings per container | 8 |
| Total Servings Per Container | 8 |
| UPC | 748927023015 |
| Unit Count | 2730.0 gram |
E**M
Really works well with combined body effort (working out, good regular eating habits)
This is soo good and tastes so delicious. Love the chocolate flavour I use it with oat milk and a little bit of water and crushed ice. Tastes like a milkshake. Sometimes I add a whole banana and peanut butter to pack in more calories. I can imagine if you drink cows milk you’d pack the weight on rapid. I have put on a stone using this but that was over a space of 6 or 7 months and I was drinking two a day but I’ve cut down to one or forget not good so I’ve had to go back to 1 a day then I’ll be back on 2. You can easily put pounds and stones on with this protein shake. You just have to be consistent really, along with eating. Consume more calories than you need (I’m 9.10st) trying to get to 11 tbh. I was eating pure beef burgers and just lean meat, bread and peanut butter along with any foods high in calorie that pack pounds on, that helped with the weight gain. Be consistent and you’ll get results. Lost count of how many I’ve brought tbh.
S**M
Great taste
I’ve used this product on and off over several years. It really is good not full of garbage like you can find in other products of a similar nature. It’s a very well trusted brand vanilla or banana is my favorite as they both taste really good. You can probably use half of the recommended serving each time and still get great results. Just stick to a really good eating plan and you’ll feel the benefits of this.
T**N
Best Mass Gainer I’ve Tried So Far
Serious Mass is perfect for anyone trying to put on healthy weight and size. It mixes well, tastes great, and gives a big boost in calories without feeling heavy. I noticed improved energy, faster recovery, and steady weight gain within weeks. Definitely a reliable mass gainer!
S**E
Very good for putting on weight. A fast method of increasing your calorie intake
This was my second purchase of the Serious Mass Protein Powder. I did not buy it for training or body building sport. I developed a temporary condition that made me inactive for a couple of months. During this time I was not eating properly or getting any exercise. I dropped from my normal and average muscular 12 stone frame to 10.5 stone in weight. I looked at reviews on products for putting on weight and the feedback on this product was really good. My own experience is that it worked for me and in only two purchases over two months I regained my weight. It was very good value for money for my situation. The taste was more bland than a fruit juice but not unpleasant in any way. I used a hand blender to mix it and this made it smooth without any dry lumps. I recommend it for putting on weight. I was able to double my eating calorie intake each day. As for body building sports, I cannot feedback on that since I think it would take a bit longer to assess.
L**N
Was happy with it. Will buy again.
Very flavourful with just water can use milk also. not watery but not thick either, good price. Was overall happy with the product.
J**T
Yum
Definitely works and great taste with water!
P**O
Protein shakes
Did not fill any different
V**A
Great product
This product is highly recommended. I always get great results.
Trustpilot
1 month ago
1 month ago