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🚀 Bulk up smarter, not harder with Serious Mass!
Optimum Nutrition Serious Mass Weight Gainer is a high-calorie, protein-rich powder designed for adults aiming to increase muscle mass and overall weight. Each 2-scoop serving delivers over 1,200 calories, 50g of blended whey protein, and 249g of carbohydrates, complemented by 20+ essential vitamins and minerals for immune support. Its versatile formula allows customization with calorie-dense add-ins, making it the go-to choice for serious weight gain and muscle growth.






















| ASIN | B0015R18SU |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy |
| Best Sellers Rank | #1,998 in Health & Household ( See Top 100 in Health & Household ) #2 in Sports Nutrition Weight Gainers #252 in Sales & Deals |
| Brand | Optimum Nutrition |
| Brand Name | Optimum Nutrition |
| Customer Reviews | 4.4 out of 5 stars 7,607 Reviews |
| Diet Type | Vegetarian |
| Flavor | Banana |
| Global Trade Identification Number | 00748927028867 |
| Item Dimensions | 15.35 x 11.42 x 5.51 inches |
| Item Weight | 2.72 kg |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer Part Number | 1031913 |
| Material Type Free | Caffeine Free |
| Model Name | ON SERIOUS MASS BANANA 6LB |
| Model Number | 1031913 |
| Net Content Volume | 11.91 liters |
| Number of Items | 1 |
| Package Type Name | Tub |
| Product Benefits | Immune Support, Muscle Growth, Weight Gain |
| Protein | 50 g |
| Protein Source | Whey |
| Recommended Uses For Product | Calorie Increase, Muscle Growth, Post-Workout, Weight Gain |
| Servings per Container | 8 |
| Supplement Formulation | Multi-Supplement |
| Total Servings Per Container | 8 |
| Unit Count | 96 Ounce |
| Vitamins And Minerals | 0.9, 3, 30, 5, 700 milligrams |
M**C
Great to reach your calorie intake
Perfect if you are trying to gain weight ( half scoop if you are a woman twice day) great flavor. You won't feel full so keep a record of what you are eating.
S**K
Great value for high quality product
Really like the banana flavor; it's the best tasting I.m.o. This product is a great deal for what it is
P**H
Gained 7 lbs in One Month
I am a 19 year old male going on 20 and am trying to gain weight and get stronger because I plan on joining the Marine Corps within a year. I started working out between 3-5 times a week doing squats, barbell curls, and benching among other things. I bought a bag of the banana flavored weight gain powder and drink it every time I work out and sometimes on off days. I use blend one scoop of the powder with 2 cups of milk and a banana. It comes to around 1000-1200 calories per drink. After only a month I had gained 7 lbs. and drastically increased my strength. I feel great and think that I look great too. My goal is to gain twenty pounds, I started out at 145 lbs and now weigh 152. My goal is to get to 165 lbs. The stuff is a chore to drink but that's how every work out powder is. I just ordered my second bag, this time I am trying the Chocolate Peanut Butter! Update to review (Forgive me for repetition or discrepancies between reviews) I have seen real results using this weight gain powder. I am training to be a Marine and I initially did not weigh enough. I am 6’2 and weighed 145 lbs. when I started working out and making these shakes. 148 lbs. is the minimum weight for my height. I set a goal to gain twenty lbs. and I reached 160 lbs. after three months. I stopped working out and drinking shakes for a while and I returned to my initial weight. I then started working out and with the shakes was able to get my weight back to 160 after about a month. I do all kinds of different workouts: running, rucking, I have back/leg day, and a chest/arm day. Core everyday and I try to workout 5 days a week, all very high intensity. I try to eat three meals a day, I’m not the healthiest eater in the world but calories are what matter when you are doing this kind of training. The MARSOC app says this blatantly, “Ideally you should eat healthy but eat anything and everything you can to get as many calories as possible. Big Macs are my best friend, each one is 500 calories. After every workout I drink a shake, what I do is I blend two cups of whole milk with one level scoop of powder, a banana, and recently I’ve started adding a teaspoon of Creatine to the shake. It ends up being about 1,200-1400 calories. I try to get between 500-1200 calories per meal. Add the shakes calories to the calories from breakfast, lunch, and dinner and you could be getting upwards of 3,000 calories in a day which is what is necessary for me to gain one lb. a week.
J**T
Almost perfect.
I review everything I buy. Especially what I'm putting into my body. Optimum Nutrition is a reputable company who really knows how to make a great product. I'm a hardgainer like most people who will be using this product. I use a few more supplements from Optimum Nutrition and this is by far my favorite. Besides Serious Mass, I also have Optimums Gold Standard Whey (Chocolate flavor) and Creatine. Let me start off by saying that the Whey's flavor is horrible. I don't understand why everyone raves about how good it tastes. Its distgusting. Serious Mass however does not dissapoint. If you feel the same way about the taste of other Optimum Nutrition supplements don't worry, Serious Mass tastes awesome, mixes very well in a shaker bottle, and contains exactly what im looking for in a weight gainer shake. PRO'S + Tastes great + Loaded with calories + Contains 3 different types of Protein. (Whey, Casein, and Egg Protein) + Very affordable + Easy on the stomach (Depending on the person this may be a problem if you follow the serving size. I'll get into that below) Con's - You may think getting a 12lb bag will last a long time. You couldn't be more wrong. Serving size is 2 scoops per shake. ONE SCOOP IS EQUAL TO 1 CUP OF POWDER. THAT IS ABSOLUTELY MASSIVE. Following the directions would cause to you finish a 12lb bag in 3 days. This is ridiculous. Half the serving and add your own ingredients. - Somewhat high sugar. This product does not add any sugar* However that doesnt mean it doesnt have enough already. its not very high. But its similar to a soda. ***Just to clarify for those that may not know this already. This shake is very filling. I expected this and it could be a good thing for some people but for someone who plans on taking this in conjunction with a meal, they may find it hard and feel very bloated after. Its recommended you eat normally and drink the shakes in between meals. I will be buying this product again and I would recommend it to those who want to try a great tasting weight gainer. You may need to experiment with your own add in ingredients like peanut butter or flaxseed oil to add more calories to makeup for the massive scoop size if you decide to half the serving size. All in all its a great product. I only wish they would have clarified how massive the serving size is a little more.
T**F
Certainly not Arnold
Started working out seriously June 2011 & had been using the 20 Gram Protien bars from Costco. Decided to step up to this. Was a little hesitant after reading some of the one star reviews, but had tried the Banana & thought it was ok. So far I'm about 70% through my first bag, using it right after working out & still use the protein bars on off days. The flavor's fine and the powder was fresh when it arrived so no complaints at all. The only possible downside is that I burp a lot after drinking it but that could be from air being incororated into the mix in the blender. As far as mixing, I blend in one scoop at a time to prevent lumps. Also, I only get some occasional muscle soreness after a hard workout ( working 4 sets to muscle failure ) and don't know if it's because the protein in this is absorbed quickly as they claim or not. Could be but who knows. I'm also up about 8 or 9 pounds since June ( a lot for me since I stated around 150 ) so everything together seems to be working. Short version is, yes, I recomend this stuff. March 22, 2012 Update. Had my annual physical. The blood test showed Creatinine High ( above range ) and protein in my urine. Doc said "If you're 18, that's ok, But.. ) since I'm "mature" (retired) that's not a good thing, and to reduce my protein intake, which I did by 1/3. So, just as a comment to all you "mature" people, your kidneys will love you more if you take in less protein than the directions recommend, even if you're working out hard (which I am). April 17th, 2012 update: Received my second bag last week. The flavor is not the same as the first. Not anywhere near as much banana flavor. Tastes a little "flat" Code on the bag is AO88364IJ. I'm guessing that's the lot number. Expiration date is 12/13. We'll see what the next bag is like.
J**S
Great taste great outcome you can't go wrong.
Love this product. Flavor is great. The effects really so work and taste is amazing. No clumps with just a regular shaker bottle. Seems to give a great boost of energy with all the vitamins and protein to go with it. Highly recommend this brand over other protein mixes so far.
P**D
Serious Mass, Serious Muscle Growth!
This banana-flavored gainer packs high calories and protein to build serious muscle size. The massive 12-pound bag delivers incredible value, immune support, and easy mixing. Highly recommended for hardgainers!
T**T
Weight Gain
Love this!!!! Bought it 3 1/2 weeks ago and I was 89 lbs I'm now at 103. I need more it's almost gone. For the first week I started with 1 scoop With milk. By week 2 I was doing 2 scoops. I'm going to have to push it up to 2 1/2 scoops per day when I get my next batch. I want to gain 25 more pounds. I am a female. It also made my chest bigger This will work great if your trying to gain weight!!!!! Worth every penny.
V**K
Gainer
Hier gibt es nicht nur Eiweiß, sondern auch reichlich Kohlenhydrate für eine schnelle Gewichtszunahme. Es schmeckt lecker und ist nicht zu teuer. Ich kann es nur empfehlen.
C**E
Bon produit
BIEN
K**A
Hervorragendes Proteinpulver für Masseaufbau
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.
R**E
Rien à dire juste parfait
C’est ma deuxième commande et franchement y a rien à dire c’est parfait et les résultats il est déjà là facile à boire le goût banane, c’est parfait pour moi
M**K
Couldn’t Be Happier
Everything about this product is fantastic. Five stars from me!
Trustpilot
3 days ago
2 days ago