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🚀 Elevate your mass game—because serious gains wait for no one.
Optimum Nutrition Serious Mass is a high-calorie weight gainer protein powder delivering over 1250 calories, 50g of protein, and 3g of creatine per serving. Enriched with 25 essential vitamins and minerals and low in fat, it supports muscle growth, recovery, and performance. Available in six flavors, it’s designed for athletes and fitness enthusiasts aiming for rapid mass gain and enhanced workout results.














| Asin | B0015R36XU |
| Country Of Origin | United Kingdom |
| Guaranteed Software Updates Until | unknown |
| Is Discontinued By Manufacturer | No |
| Item Model Number | 1031919 |
| Manufacturer | OPTIG |
| Product Dimensions | 20.32 x 20.32 x 25.7 cm; 2.73 kg |
User
Taste is good love it 😊
Always good never have a problems gain mass easy ❗️‼️
User
Perfect blend of everything
A wonderful product, strawberry mixes perfectly and produces results. Contains high protein and carbohydrate content but as a bonus, creatine too!If you take the recommended dosage, it wont last long, but isnt the most expensive around (review for tub).Rating is based on taste, mixing and results.
User
Lovely
Love this stuff. Taste great mixes well.Seen results on the scales adding this to the diet.Just a shame on the price. But saying that the cheaper ones are cheaper for a reason
User
Great gains
Brilliant for adding those extra calories to your diet if like me you struggle to eat the required amount when bulking. Its definitely made a huge difference, I can see the changes in my body since starting with the serious mass. I use one scoop an hour before my gym session and one scoop before bed with a normal protein shake after the gym. Its worth investing in a decent blender as the usual protein shaker just doesn't cut it as there is a lot of powder in one scoop. I also found that using milk makes the shake too thick so I just use water to mix although it doesn't taste as nice with water. Well worth the cost. I havent found a better alternative to this weight gainer and it includes creatine aswell saving you the extra cost there.
User
Great size
Great product and size.value for money especially if it’s on offer.good taste too
User
good but portion size to big
At first glance this looked like a great powder but after using it for a week i realised it was as amazing as i first thought. The nutritional values are all great, one of the highest calorie shakes i have seen. But this is all to do with the portion size, the scoop/shovel is MASSIVE! So big infact you struggle to get it out of the tub. So not as good value as first thoughtbecause the tub doesn't last long atall. If you do follow the portioning though you will put on weight i personsally put on half and stone in a couple weeks and most of that was muscle and i generally struggle to put on any weight so was happy with this. The flavours not bad a guess, i went with strawberry was a bit sweet and you could smell it upstaires when i opened the tub. But not to bad very managable and didnt clump atall which was nice. All in all a good product but wont last very long.
User
Nutri drink
Great taste it’s a nice shake
User
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.
User
Intendo e buon prodotto
Buona qualità
User
Good taste
I usually buy a chocolate flavor, so it’s the first time to taste a strawberry, And it was delicious
User
Efficace pour prendre de la masse rapidement
Ce mass gainer est une bonne option pour ceux qui cherchent à prendre de la masse. Le goût est agréable (j'ai pris le goût chocolat) et se mélange bien avec de l'eau ou du lait. Je l’ai intégré à mes shakes post-entraînement, et il m’aide à atteindre mes objectifs calorifiques quotidiens sans avoir à manger des quantités énormes de nourriture.Il est assez riche en protéines et glucides, ce qui permet une bonne récupération et une prise de masse musculaire efficace.En revanche, il est important de le consommer avec un programme d’entraînement adapté, car il est assez calorique et peut entraîner un petit gain de graisse si la consommation n’est pas bien dosée.Je recommande pour ceux qui ont du mal à atteindre leurs objectifs caloriques ou qui cherchent à augmenter leur masse musculaire.
User
Satisfecho
Puedo decir que sí funciona para lo que promete: ganar masa y peso rápidamente. Cada batido tiene muchísimas calorías (más de 1 200 si usas los dos cacitos completos), así que es ideal para quienes les cuesta subir de peso o tienen un metabolismo muy rápido como en mi caso, Se nota el aumento de energía y masa corporal en pocas semanas si lo combinas con entrenamiento.El sabor está bastante bien, aunque es algo dulce.Puede causar pesadez, gases o molestias digestivas si no estás acostumbrado o si lo tomas muy rápido.En fin, lo recomiendo si estás enfocado en ganar peso de forma rápida y no te importa tanto la limpieza de los ingredientes. En mi caso ha sido una buena ayuda para subir de peso de forma controlada. 👍
User
Great Mass Gainer
Strawberry is amazing, not sure why all the bad comments regarding the flavour..1scoop blended with 500ml sugar free oat milk and some ice, perfect lovely flavour.
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