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🚀 Bulk smarter, recover faster, and own your gains with Serious Mass!
Optimum Nutrition Serious Mass is a top-tier weight gainer delivering 1,200+ calories, 50g protein, and 250g+ carbs per serving, enhanced with vitamins, minerals, and creatine to support muscle growth, immune health, and sustained energy—perfect for professionals serious about leveling up their physique and performance.






















| ASIN | B0015R36SK |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy |
| Best Sellers Rank | #1,734 in Health & Household ( See Top 100 in Health & Household ) #2 in Sports Nutrition Weight Gainers #218 in Sales & Deals |
| Brand | Optimum Nutrition |
| Brand Name | Optimum Nutrition |
| Customer Reviews | 4.5 out of 5 stars 34,641 Reviews |
| Diet Type | Vegetarian |
| Flavor | Chocolate |
| Item Dimensions | 6.14 x 6.14 x 9.76 inches |
| Item Weight | 0.9 Kilograms |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer Part Number | 1101537 |
| Material Type Free | Caffeine Free |
| Model Name | ON SERIOUS MASS CHOCOLATE 6LB |
| Model Number | 1101537 |
| Number of Items | 1 |
| Package Type Name | Tub |
| Product Benefits | Immune Support, Muscle Growth, Weight Gain |
| Protein | 50 Grams |
| Protein Source | Whey |
| Recommended Uses For Product | Calorie Increase, Muscle Growth, Post-Workout, Weight Gain |
| Servings per Container | 8.0 |
| Supplement Formulation | Multi-Supplement |
| Total Servings Per Container | 8.0 |
| UPC | 748927022995 |
| Unit Count | 96.0 Ounce |
| Vitamins And Minerals | 0.9, 3.7, 30.0, 5.0, 700.0 Milligrams, 410, 80 Milligrams |
C**R
Great product and price
Great taste, mixes easy and great price
K**S
It helps a lot
Optimum Nutrition Serious Mass is a great choice for anyone looking to gain weight, build muscle, or increase overall calorie intake. The Chocolate flavor mixes smoothly—especially if you use a blender—and has a rich, dessert-like taste without being overly sweet. Each serving delivers a very high amount of calories, protein, and carbs, which makes it ideal for people with fast metabolisms or those who struggle to eat enough throughout the day. It also includes added vitamins, minerals, and creatine for extra support. The bag is large and lasts a good amount of time depending on how much you use. The powder is heavy, so mixing by hand can be a bit difficult, but blending solves that problem easily. Overall, Serious Mass is effective for healthy weight gain and muscle-building goals. If you need a calorie boost and don’t mind a thick shake, it’s a solid and reliable product.
J**E
If your skinny and have trouble gaining this is for you
Ok so I have been using this product for over a year now. I cycle it in bulking and cutting stages with a pre-workout (Cellucore C4 Extreme) and attempt to consume healthy food in addition to the product. I am an amateur with no professional experience, but this product has worked for me. I am a skinny guy with a very quick metabolism. I train for endurance and strength, NOT mass. If you are a skinny person who has trouble gaining weight I recommend giving this a shot. This is not for body builders who count calories and want to stay lean. Its a weight gainer! I am currently 5'10, 170 lbs. During this cycle I am training 3-4 days a week between 60-90 mins per workout. Like I said I train high endurance and strength, not heavy lifting. In the last 3 months I have gained 15 lbs and lowered my body fat percentage by 4%. I consider this a substantial achievement as I have never been able to put on weight unless I gain lots of fat. When I was cutting I used this as a meal replacement with low calorie intake and actually lost weight taking it! RATIO: The great thing about this product is you can tailor the servings to meet your needs. If you desire more calories and carbs, use more, if you start to notice your getting fat, use less. Start with 1/2 serving a day and increase as needed to reach your desired goals. I generally consume a 1/2 serving mixed with 4-6oz of fat free milk within 30 mins of working out in the morning. I then eat high protein foods throughout the day (Cottage cheese, Greek yogurt, oatmeal (rolled oats, not that instant crap), chicken breast, tuna, brown rice, etc). I try to eat as much clean food as I can throughout the day. I then have another 1/2 serving with milk in the afternoon. TASTE: This product tastes amazing. 1/2 serving mixed with milk comes out like a milkshake, not too thick, not too thin. If you go for the full serving it is very thick and heavy. Its hard to drink that much without throwing up. Split it up into 1/2 servings throughout the day. SIDE EFFECTS: I personally have major gas from this product. Its not horrible, but I have to leave the room throughout the day at work. I anticipate this and take breaks. No big deal. I have had normal bowel movements while taking this product, but I do consume high fiber oatmeal to assist with the digestion. I find myself dropping bricks if I do not consume enough fiber with this product, again, adjust the servings to fit your body needs. FINAL THOUGHTS: Overall I enjoy this product. If you use it as a meal supplement during your cutting stages you may notice you actually LOSE WIGHT while taking this product. I sure did.
R**4
Great addition to a well balanced bulking diet plan
I have been bulking/ cutting for over 20 years and like to use this Mass gain as a meal replacement when bulking. Am I a professional? Hell no, I have to work and do not have the luxury of eating, sleeping, and 2 hour workouts With that said…I am 5’ 11 and 230 with bodyfat percentage depending on whether I am bulking or not. Know your body and what your caloric intake should be. With my body weight and eating 6 meals a day—my bulking caloric intake is 680 calories a meal- 1/2 serving of powder is plenty when mixed with almond milk. If you lose weight while using this like some posts state—-it isn’t the powders fault- this doesn’t work miracles, there are many other aspects to gaining/ maintaining mass Pros: -Contains creatine -Massive amount of calories/carbs/proteins- more than the normal body can process at once when using the serving size of 2 scoops-One scoop provides plenty of calories to repair muscle while you sleep, making this 32 servings instead of 16 -Powder makes it easier to quickly add a meal to your plan when you are tired of eating chicken and rice 5 times a day -mixes very well -It works because it contains a great balance of calories/carbs/protein *** drinking this powder only adds a good calorie ratio to your diet plan, it will not lift the weights for you or eliminate the need to eat 4-5 other meals a day -It is a quality supplement, ranked #4 bulking supplement in 2021 Cons: -It tastes ok…it is a supplement, not a candy bar -Price per serving is mid-range -If using as recommended (2 scoops per serving) it will only last 16 days - I prefer my supplements in contains over bags, this is an easy fix though if you are anal like me Overall, great product I’ve been using for years. This will not turn you into a beast if you are counting on it to work miracles…you still need to have a sufficient diet plan and work you butt off to gain mass. Note- if you are looking to just gain weight this product will definitely work! Take one serving daily and sit on the couch. Do your homework if debating on using a different brand, powders that contain arsenic is something to be very wary of. Good luck in your bulking adventure
P**X
It works but better options
First of all I tried the vanilla and the chocolate flavor. Please do yourself a favor and only get the chocolate flavor. Listen, the chocolate flavor is the same in every other brand protein shake or mass gainer because they all use cocoa powder. So if you like chocolate you will not be surprise when you taste it. Compared to the vanilla one which has a very unique taste that I did not like. Just get the chocolate one. Also, the servings say two scoops but if you have not seen the scoop it is the same size as a detergent scoop. It is even hard to take it out of the bottle. One scoop is enough for one serving (625 calories). If you do decide to take two scoops space them out throughout the day. I do not recommend this though since you should be getting the rest of your calories and nutrients from real food. One scoop every day is fine though. Ok, so how did I mix it? I used a electrical blender. I have used a shaker bottle with the metal spring ball thing before since I did not have a electrical blender in my college dorm. But it taste much better if you blend it with an electrical blender because you will not have large clumps. Also, you can add other ingredients if you like such as peanut butter (chocolate flavor + pb taste freaking good just like reeses cup). Peanut butter adds more calories and protein to your shake. Do not take this mass gainer if you are not working out at least 3 times a week. You will simply gain a gut around your stomach area unless you are anorexic. Even if you are anorexic, you should still work out. And if you are like me and are still looking to add calories to your serving, add in 1 tablespoon of olive oil (120 calories), and you will not taste as long as you drink fast enough so the olive oil does not float up after you blend it. So my shake usually is 1 scoop (625 calories, 24g protein), 12fl oz of milk (225 calories, 12g protein), 2 tbsp of peanut butter (190 calories, 7g protein), 1 tbsp of olive oil (120 calories). Total of 1160 calories, 43g of protein (hopefully my math is correct). With all of that being said, I recommend to buy Optimum Nutrition 100% Whey Protein (Extreme Milk Chocolate flavor) instead of serious mass because this gainer has a ton of carbs. The first ingredient is Maltodextrin which is normally found in soda and candy. You save a lot of money also since the whey one has more servings. Last advice, use MyFitnessPal app if you have trouble gaining weight. Make sure you are actually hitting your calories goal. I used to think that I had a fast metabolism because I ate so much. But in reality after I calculated the calories, I was far away from hitting 3000 calories. I gave it 5 stars because it worked for me. I went from 145lbs to 160lbs in three months. Yes I gained fat but also muscle because I worked out. I no longer take this after finding ON 100% Whey. Much cheaper per serving, a better selection of flavors, and a lot less carbs. Yes, it might not have the calories but you can definitely create your own mass protein shake by using the correct ingredients. Google svunt shake if you need an idea of creating your mass gainer with whey protein (it has 1659 calories and 95g of protein). Have fun gaining.
A**N
Solid weight gainer – works great and tastes good!
I’ve been using Serious Mass for a few weeks now, and it's been super helpful for adding extra calories to my day. I’ve always had a hard time gaining weight, and this makes it way easier to get in the calories and protein I need without feeling like I’m constantly eating. The chocolate flavor is actually really good—especially when you blend it with milk, peanut butter, or a banana. Just a heads-up, the serving size is huge (like, 2 giant scoops), so a blender is a must. Don’t even try mixing it with a shaker bottle. I also like that it includes creatine and some vitamins, which saves me from buying those separately. Only downside is it can feel a little heavy if you’re not used to big shakes, so I started with half a serving and worked my way up. But overall, it’s been awesome for helping me bulk up. I’m already seeing some gains.
R**O
“Pro” tips for making it work!
I am pushing 40 years of age and have been one of those guys that people hate on because I can eat anything and not gain an ounce. Granted, I stay busy and active, but making gains off 150 lbs always escaped me for the entirety of my 6’1” adult life. In the last two months I gained a solid 20 pounds using this shake mix and hitting the weights 4 times a week. So sticking to a gym routine is difficult; it takes time out of your day, it takes effort, and it takes motivation and energy that you may not have. If you have the gym routine locked down, the second most difficult part is proper nutrition to meet your goals. For me, packing in enough calories to get the gains that motivate me to keep going to the gym was the obstacle I had to overcome. This shake mix made it easy; the drink is actually drinkable, tastes good and doesn’t make you want to vomit from feeling bloated. Stick with it and it will work. Here are a few tips: - Use milk and not water. If you’re going to drink a weight gainer, you want to consume as many calories in as little substance as possible since it is supposed to supplement regular meals and not replace them. Milk adds an additional 400 calories, has calcium to build up the bones for the beast you want to become. It also makes the shake taste better. - Use a blender. Yeah I know it sucks to clean afterwards, but here is how you get around that. Add the milk first then turn it on high for a few seconds. The milk will froth up. When you dump the two huge scoops of powder in, it will rest nicely on the fluffy milk cloud and not stick to the sides, which will make cleaning the blender MUCH easier. - Add a banana. Makes the shake taste better. Potassium: it’s good for you and your muscles. - Add 2 tbsp of peanut butter. Make sure you use smooth and NOT chunky! (The peanut chunks get soggy and disgusting) This, combined with the banana will bring the calorie count to almost 2000! The oils in the peanut butter also seem to de-gas the shake so you aren’t drinking a bottle of bubbles and you don’t feel prematurely full. - Buy the 45oz Blender Bottle to keep the shake in for consumption. It is the most convenient way to keep the entire contents you just mixed up in one container, and it has a heavier mixing ball for thicker shakes. - Don’t drink it all at once. Remember, you want to still be able to eat full meals. I usually make mine up at night after dinner and then drink half by the end of the night. It makes me fall asleep easier. I then take the other half to work and consume it right after breakfast. I am very pleased with how this has worked for me. The price usually does not fluctuate on this huge bag, but you can always subscribe and save a few dollars once you establish your consumption rate. Happy gaining! 5/2022 Edit: I am sitting steady at 180lbs, benching 225 for 9 reps on my last set after 185/205 (that 10th is elusive!) and can squat 300 twice. I never thought this could be possible, but I do have this gainer to thank for getting me there. I still keep a bag around in case I need a calorie boost. 🤙🏼💪🏼
T**R
What They Don't Tell You
What they tell you. It tastes great and is a good supplement to build mass. What they don't tell you. Each serving consist of 2 huge heaping scoops of powder and 24 ounces of fluid (water or milk). This combination results in 48 ounces of liquid delight that they claim is a single serving. On what planet is 48 ounces a single serving? To put this in perspective, that is 2 full to the brim Shaker bottles that are intended to be consumed as one serving. 340 grams of powder from one serving translates into 3/4 of a pound of powder. Again to put this into perspective, the huge tub of powder you will recieve equals ONLY 8 advertised servings. The other thing they don't tell you is the powder is so fine and gummy that the only way to prepare the drink is to use a full sized blender. No Shaker bottles here. Preparing this mix is a mess. The powder is so fine that it creates a gummy mess that adheres to the side of the blender like Venom on Eddie Brock. Prepare to spend a significant amount of time coaxing the paste free to get it to properly mix. Great protein mix, but I sometimes I feel like it would be easier to eat 5 chicken breasts too reach the same calorie goal, than to put down 48 ounces. I realize that it can be broken up throughout the day, but so can multiple meals. There is also the option of using another protein supplement with a realistic serving size, multiple times a day. In the end, I feel like that is all they have done with this product. They have combined a multiple dose, throughout the day protein powder into a single serving, trying to advertise it as a solution that they obviously have not solved.
N**N
Produit parfait pour les ectomorphes !
Comme la plupart ici, j'ai du mal à prendre du poids. Après lecture des avis ici et sur le net, je me décide à tester ce produit ! 52 kilos pour 172 à l'origine, j'ai gagné 3 kilos en 1 mois ! Voir la balance afficher une hausse de poids donne vraiment un sentiment de satisfaction ! Mon alimentation reste toujours la même, à savoir, 3 repas par jour, petit déjeuner, déjeuner et dîner. Je répartis la prise en deux parties, une dose pleine le matin en même temps que le petit déjeuner (ça me donne également de l'énergie pour la journée) et une dose pleine dans l'après-midi ou la soirée après une séance de musculation. Ma séance de musculation ne dure par plus de 30 minutes, je fais de courtes séries mais privilégie des poids lourds. Pas de prises de bide à déclarer, pensez à faire une activité physique pour éviter cela ! Produit à conseiller pour ceux qui ont vraiment du mal à prendre du poids.
J**E
Schokolade lecker, hochwertige Carbs und keine Klumpen. Guter Weight Gainer!
Als Hardgainer, der schlecht an Gewicht zulegt, habe ich mich, wegen der immensen Zeitersparnis, für einen weight gainer entschieden. Da die meisten weight gainer total uberzuckert sind und man dadurch nur Fett einlagert, habe ich nach einem Produkt mit sehr wenig Zucker und hochwertigen Kohlenhydraten gesucht. Serious mass von Optimum nutrition gibt mit genau das was ich gesucht habe. Zu den hochwertigen Carbs sind noch viele Proteine und Aminosäuren wie glutamin enthalten. Zum Geschmack: ich habe viele Rezensionen gelesen und habe herausgefiltert, dass Schokolade wohl ganz ok sein soll. Somit habe ich auch Schokolade bestellt und kann sagen,dass es mehr als okay ist. Definitiv schokoladig, nicht zu süß und überhaupt nicht mehlig! Auch das Klumpen kann ich nicht bestätigen. Ich habe es mit einem Mixer mit Wasser gemacht und hatte 0,0 Klumpen. Mit Milch 0,3% war es genauso. Da muss man evtl die Schuld auf den Mixer und nicht auf das Produkt schieben! Krass ist natürlich der Messbecher. Ich habe noch nie so einen großen Messbecher gesehen, den ich sogar zweimal voll machen muss. Aber ok,man will ja auf die Kalorien kommen. Durch die Menge die man für einen shake braucht, wird die Dose also relativ schnell leer sein. Das ist das einzig negative! Ansonsten ist dies der hochwertigste weight gainer, den ich kenne, der nicht durch Zucker, sondern durch hochwertige Kohlenhydrate glänzt. Ich komme damit prima auf meinen Überschüss und wenn ich nach dem Training mal nicht kochen kann, bin ich durch den Shake nahezu perfekt versorgt, denn er füllt meine Glykogen - und Proteinspeicher. Geschmack in Schokolade ist lecker! Werde ich wieder kaufen!!
A**R
ガリガリの人に見て欲しい
今まで代謝が良すぎて全然太らなくてこれを試してみました。僕の場合1日に1200kcalを2回摂ってるので正直キツイです。味も一気に飲むと甘ったるすぎるので分けて飲むのをおすすめします。ほんとにガリガリで少食でも無いのに178cmの53kgでした。普段の食事等もがんばって1日だいたい3400kcalくらい摂れるようにしていたら3週間で60kgまで増えました。これからもこれを飲んでもっと増やします。僕のように自分を変えたい人にとっては最高の商品だと思います!
B**O
Gainer
Ottimo prodotto
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!
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