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๐ Bulk up like a boss with Serious Massโbecause average gains are so last season.
Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering over 1,200 calories, 50g of blended protein, and 250g of carbohydrates per 2-scoop serving. Enhanced with 20+ vitamins and minerals including immune-supporting Vitamin C and Zinc, itโs designed for serious muscle growth and weight gain. Perfect for post-workout or between meals, it offers versatile blending options to maximize your calorie intake and fuel your bulk-up journey.






















| ASIN | B00OV0VYHI |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy |
| Best Sellers Rank | #1,397 in Health & Household ( See Top 100 in Health & Household ) #1 in Sports Nutrition Weight Gainers #165 in Sales & Deals |
| Brand | Optimum Nutrition |
| Brand Name | Optimum Nutrition |
| Customer Reviews | 4.5 out of 5 stars 4,924 Reviews |
| Diet Type | Vegetarian |
| Flavor | Chocolate Peanut Butter |
| Global Trade Identification Number | 00748927052572 |
| Item Dimensions | 11.5 x 5.5 x 16 inches |
| Item Weight | 12 Pounds |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer Part Number | 1056371 |
| Material Type Free | Caffeine Free |
| Model Name | ON SERIOUS MASS CHOC PB 12LB |
| Model Number | 1056371 |
| 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 | 16 |
| Supplement Formulation | Multi-Supplement |
| Total Servings Per Container | 16 |
| UPC | 748927052572 |
| Unit Count | 192.0 Ounce |
| Vitamins And Minerals | 0.9, 3.7, 30, 5, 700 Milligrams |
V**Y
Good for price point.tastes good
Tstes good and works
K**K
lives up to its name
Serious Mass really lives up to its name. If youโre looking to put on size, this is one of the easiest ways to get a huge calorie and protein boost in one shake.. The taste is solid (Iโve tried Chocolate and Vanilla), though itโs definitely thick โ I usually blend mine with milk or add a banana/peanut butter to make it smoother. Itโs filling, so I donโt use it every day, but on heavy training days itโs perfect. The bag is big and lasts a while, though it can be a bit pricey. Overall, a great option if youโre serious about bulking and need extra calories.
A**R
Best Purchase that Money can Buy
My most recent purchase from Amazon was the protein supplement, Optimum Nutrition Serious Mass. The reason I am writing this review (I usually donโt write reviews, unless the product is exceptional) is because Iโve found this product to be extremely helpful in my fitness goals. As a male in college, I donโt always have a lot of time on my hands. As you can imagine, college students often have varying and complicated schedules that require convenience and on-the-go products for our busy lives. But this product is definitely not only for college students but for people of all walks of life; people who need the right amount of nutrients and calories in a quick and convenient way that tailors to their schedule. Iโve been using this protein shake for quite some time now as this has been my fourth or fifth purchase. I wanted to wait for some time to see if this product does indeed have any positive effect on my fitness goals, so in short, Serious Mass by Optimum Nutrition does work. Who is this for? Serious Mass protein powder is for anyone looking to gain weight in a healthy, convenient, and safe way. It is for people who may need a boost in their weight due to their health situations, for lifters, bodybuilders, athletes, fitness enthusiasts and the list goes on. As for me, I am using this product to add on more weight when I go to the gym to lift and to increase muscle mass. Convenience Naturally, I have an extremely high metabolism. Since I am a hard gainer, to acquire more weight I need to eat a lot throughout the day. Because of time constraints and busy schedules, Serious Mass makes it easy to consume, essentially, a high-caloric meal. How much to use? The directions for this protein shake asks for a serving of two scoops; however, I have found this to be way too much as it is too chunky and thick even with the help of a blender. I suggest to use just one scoop as the scoop thatโs included is very large with it being already about 625 calories. You can use this as a meal replacement but for optimal effect, this should be taken in between meals and before bed. Personal Experience I personally have found this extremely beneficial in gaining muscle. Within a couple of weeks to a month there are noticeable gains in muscle growth. As for taste, the protein powder actually tastes good unlike other brands; so far Iโve had strawberry and chocolate, both are very good. The only small issue that I have had with Serious Mass (along with all other protein powder supplements) is the need to use a bathroom relatively soon after consuming this product. As with many protein powder and supplements, it usually increases bowel movement. Then again it can be thought of as a small sacrifice to the greater benefits that are to come. Despite this review being quite lengthy, I truly hope that your goals will be met for whatever situation you try to achieve. As I have found this product very helpful; I hope that it too will benefit you all as well. Best wishes to your health and journey!
J**E
Pretty good flavor
Loads of sugar I understand sugar is calorie but there are other brands that use different calorie content that wonโt give that too much sugar feel so I wonโt buy this again but great taste itโs a good product if your not sensitive to sugar
T**R
BUY THIS, GET BIG
Tastes great and includes creatine and glutamine which were two supplements I had to take alongside my previous protein. I add a tablespoon of instant coffee with the serving (2 scoops) of this mass gainer and it tastes really good. The only supplements I take that aren't included in the shake are L-Arginine, Citrulline, and a multivitamin. I suggest either taking a probiotic or eating some yogurt everyday to keep your digestive system in check and get the most out of your increased calories! Everyone talks about protein but they forget about carbohydrates and if you want to get big you need A LOT carbohydrates post workout and throughout the day. As for the price, it may seem high, but, when you consider it includes creatine, glutamine, and it has more calories than a large meal per serving, it is actually an amazing price! Remember to eat a lot of real food throughout the day too. The scoop is HUGE! Do not buy a normal sized (24 oz) shaker cup. You might be able to squeeze it into a 28 oz but I would suggest 32 oz or higher. That being said it actually mixes easier than any protein I have tried, it is just a large volume. Get the chocolate peanut butter flavor and put some instant coffee in there! I mix with water and it tastes awesome. This is probably my new protein long term. As long as you take this only after you workout it seems to all be packed on as muscle at least for me. Obviously if you just sit on a couch and drink this stuff you would get huge. This stuff is all around perfect for skinny dudes and hard gainers like myself. If I had a time machine, I would tell myself in high school to take this stuff! PRO TIP: The scoop is buried in the bag, do not dig around for it like an animal! Open the bag, if you do not see it close the bag and invert it a few times, open the bag again. Repeat until you see the scoop! This stuff is sticky by the way, so you really don't want to dig around in it.
M**Y
Great Taste and Ingredients
Tastes good, good ingredients, price is amazing. Good amount of calories per serving which is exactly what I need when the GLP-1s make me not hungry.
J**.
Good but bag came damaged
I'm enjoying the taste and nutrition, but the bag had a hole in it upon arrival and the mix was all over the box and made a mess. Probably shouldn't be drinking it but have used 6 times now and feel fine. Didn't want to have to return and then re order
A**N
Solid starting gainer
Since starting to workout, I needed something more when it came to protein powder because of my skinny build. It has always been tough for me to put on weight let alone muscle, so I thought I would try my hand at taking a mass gainer. This was the very first gainer I have ever used and I did enjoy it. Now for skinny guys like me, let me be clear that you are NOT only supposed to drink this, you also have to make sure you get your solid meals throughout the day. I currently take a gainer twice a day, once in the morning and once after working out. Then I also have my three meals that consist of nutritional things such as vegetables, carbs, and more protein. The thing about many mass gainers is that the scoops are big, just like in this one. Just one scoop look like a mug you would drink tea from. So keep in mind to get 1250 calories, you have to use TWO of those huge scoops, along with milk which makes it thicker. This gainer is pretty thick and will leave your stomach feeling full, and not just full, it will leave you feeling like you drank cookie batter. Here is what I recommend for "hard gainer" males when it comes to working out and diet to gain that muscle effectively. 1. Make sure you find a protein powder or mass gainer that works for you personally, it could be this one, or something like a Clean Gainer that is easier on the stomach. 2. Make sure you also eat your meals throughout the day because there is no substitute for real food. Gainers are supposed to be there as an extra push to reach your total caloric and protein intake for the day. 3. Always keep track how much protein, carbs, and calories you are taking throughout the day. Try to reach your target every single day to help gain muscle and weight. 4. Workout each body part twice a week to make sure you are getting a lot out of your diet and using it to your advantage instead of letting it go to waste. 5. Lastly, add other supplements to your daily routine such as fish oil, vitamin C, and creatine. All of these will help with staying healthy, recovery, and building muscle. I do recommend this gainer as a starter for anyone out there, but there are many other options to choose from so do your research before hand because everyone is different, you just need to find out what works for you.
J**T
Fast delivery
Like the flavour.
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