

🚀 Bulk Up, Stand Out: Serious Mass for Serious Gains
Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering over 1,200 calories, 50g of blended whey protein, and 250g+ carbohydrates per 2-scoop serving. Enhanced with 20+ vitamins and minerals including immune-supporting Vitamin C and Zinc, plus creatine for muscle power, it’s designed for adults aiming to maximize muscle growth and healthy weight gain. Perfect for fast metabolisms or those struggling to meet calorie needs, this chocolate-flavored powder blends smoothly and offers versatile mix-in options to customize your mass-building journey.













| ASIN | B000GIPJ0M |
| ASIN | B000GIPJ0M |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy |
| Best Sellers Rank | #7,350 in Health & Household ( See Top 100 in Health & Household ) #4 in Sports Nutrition Weight Gainers #867 in Sales & Deals |
| Brand Name | Optimum Nutrition |
| Customer Reviews | 4.5 4.5 out of 5 stars (15,886) |
| Date First Available | September 16, 2003 |
| Department | unisex-adult |
| Diet Type | Vegetarian |
| Flavor | Chocolate |
| Global Trade Identification Number | 00748927023800 |
| Is Discontinued By Manufacturer | No |
| Item Dimensions | 11.5 x 5.5 x 16 inches |
| Item Weight | 12 Pounds |
| Item model number | 1101529 |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer | Glanbia Performance Nutrition |
| Material Type Free | Caffeine Free |
| Net Content Volume | 13.88 Liters |
| Number of Items | 1 |
| Package Type Name | Tub |
| Product Benefits | Immune Support, Muscle Growth, Weight Gain |
| Product Dimensions | 11.5 x 5.5 x 16 inches; 12 Pounds |
| Protein | 50 Grams |
| Protein Source | Whey |
| Recommended Uses For Product | Calorie Increase, Muscle Growth, Post-Workout, Weight Gain |
| Supplement Formulation | Multi-Supplement |
| Total Servings Per Container | 16 |
| UPC | 748927023800 748927063592 |
| Unit Count | 192.0 Ounce |
| Vitamins And Minerals | 0.9, 3.7, 30, 5, 700 Milligrams, 100, 100, 1560, 410, 44, 59, 80 Percent Daily Value |
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.
D**N
Great weight gainer
Great product for the money. It mixed well it's loaded with calories and carbs. Tastes great. It did what it was designed to do so if your looking to add some lbs on the scale this will work just fine.
C**S
Quality mass gainer
Optimum Nutrition has consistently produced some of the highest quality whey products I've used. Easier to stomach and better tasting than competitors. Dissolves well in water as well as milk when mixed properly. I've used the product for years and it has served as an effective compliment to my workout regimen.
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
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.
N**H
Good
M**T
Sehr gutes Produkt! Löst sich gut auf, schmeckt angenehm und hilft beim Zunehmen und Muskelaufbau. Klare Empfehlung für alle, die Masse aufbauen möchten.
M**N
Good quality but result after 20/25 days know
J**O
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!
A**A
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