










🚀 Serious Mass, Serious Gains — Don’t just grow, dominate your goals!
Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering over 1,200 calories, 50g of blended protein, and 249g+ carbohydrates per 2-scoop serving. Enhanced with 20+ vitamins and minerals including immune-supporting Vitamin C and Zinc, this banana-flavored powder is designed for adults seeking efficient muscle growth and weight gain. Versatile for blending with calorie-dense add-ins, it’s the go-to formula for professionals committed to maximizing their physique and performance.






















| ASIN | B0015R18SU |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy |
| Best Sellers Rank | #2,399 in Health & Household ( See Top 100 in Health & Household ) #2 in Sports Nutrition Weight Gainers #326 in Sales & Deals |
| Brand | Optimum Nutrition |
| Brand Name | Optimum Nutrition |
| Caffeine Content Description | Caffeine Free |
| Customer Reviews | 4.4 out of 5 stars 4,179 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 Kilograms |
| 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 Grams |
| 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 | 2730 Grams |
| Vitamins And Minerals | 0.9, 3, 30, 5, 700 Milligrams |
A**Z
Serious Mass rich in protein and vitamins that your body needs
I am very thin and I started taking this protein in smoothies and I have been able to notice the change in me apart from having a delicious flavor it has all the vitamins and probiotics I need at the same time it whets the appetite I love it I suggest them to all those who need to gain body mass
A**Z
Decent Tasting Weight Gainer for Those Who Struggle to Eat Lots
As an extremely underweight guy at 5”11 (115-120 pounds) I finally wanted to put on some weight and muscle to stop being known as a stick person. Before even finding out about this product I tried gaining weight the natural way of eating 4 times a day and eating the right foods. I just couldn’t stomach eating more than twice, and let alone over 2000 calories. Cooking and cleaning was also a hassle, so I decided to try this out. I got banana flavor because I think vanilla and chocolate are gross in powders and it seemed to be the right choice for me. Although it’s still a powder and it’ll taste a little strange, I think this is pretty easy to consume for a supplement. Two months later and I went from 120ish to 160. (: I did get stretch marks from gaining weight fast and heavy lifting, but they’re minor and become less noticeable over time. Honestly I’ll probably buy more when I try to get to 170. Overall I’d say it’s worth it and it really does help if you take it at the right time of day and consistently after a work out.
P**R
Incredible product
Nice taste ain’t gonna lie 🩷🩷
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.
F**N
Weight gainer
This product always put my weight on when I need it. I recommend this product to anyone needed to put on a little or a lot of weight
M**A
It helps to gain weight
I bought it for my skinny son who wanted to gain weight and it helped him gain weight. He went from 165 to 180 lbs.
T**E
Helpful! Type I Diabetic Review
I have type I diabetes and struggle with maintaining my weight, this product had been helpful in maintaining my goals in weight gain and maintaining a healthy diet. Though, I will say the chocolate flavor is a staple and much more delicious than the banana. It's hard to eat the banana flavor all at once without feeling nauseous. I feel the need to eat fast because my glucose number shifts and makes me not hungry. I can do it just fine with the chocolate flavor, but the banana one has me struggling. Regardless, it's a good buy for your money, especially if you're recovering from some form of an ED.
P**L
Awesome Product-Gain Muscle Quick
I am about 6 foot 140 and no matter how much I have worked out, worked in the yard, played sports, I am still skinny and can't gain muscle. I have tried things like mass xxx which was a horrible investment and had to find something cheaper for me to afford and work well at the same time. Serious mass was awesome, its like $25 for a 6 pound tub and I gained around 8 pounds of muscle, lost a little because I got real sick for a whole week but I'm adding it back on now and just finished the first of 2 6 pound tubs I bought. I used to be lactose intolerant so I hate milk, chocolate, ice cream, cake, etc, so I'm sure you all know how difficult it is to find a protein powder that isn't chocolate or cookies and cream or something like that. Thankfully there was banana Serious Mass which surprisingly tasted pretty good even with milk. One serving of this is huge, 2 big scoops with 24 ounces of milk; if you can drink all that in one sitting props to you but what I usually do is drink one 12 ounce cup after my workout then another either when I wake up or when I go to bed depending on when I workout that day so the cups are spread throughout the day. If it works for my skinny self I can't see it not working for you!
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