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🚀 Bulk up like a boss with Serious Mass — because average gains are so last season!
Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering over 1,200 calories, 50g of blended whey protein, and 249g of carbs per 2-scoop serving. Enhanced with 20+ vitamins and minerals including Vitamin C and Zinc for immune support, plus creatine for muscle performance, it’s designed for adults aiming to bulk up efficiently. Ideal for post-workout or between meals, this chocolate-flavored powder blends best with a blender and offers versatile mix-in options to maximize your calorie intake and muscle growth.






















| ASIN | B0015R36SK |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy |
| Best Sellers Rank | #1,351 in Health & Household ( See Top 100 in Health & Household ) #1 in Sports Nutrition Weight Gainers #158 in Sales & Deals |
| Brand | Optimum Nutrition |
| Brand Name | Optimum Nutrition |
| Customer Reviews | 4.5 out of 5 stars 32,405 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 |
| Supplement Formulation | Multi-Supplement |
| Total Servings Per Container | 8 |
| UPC | 748927022995 |
| Unit Count | 96.0 Ounce |
| Vitamins And Minerals | 0.9, 3.7, 30, 5, 700 Milligrams, 410, 80 Milligrams |
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.
R**S
Awesome protein shake brand!
Love this product. I get sick to where I cant eat this helps me pull back the calories and rebuild my muscles quickly so I dont lose my progress. The taste is good and milky doesn't have soy (which im allergic to) which most proteins contain. There is a chocolate smell that is very pleasant. It dissolves without having to be blended and blends well in my shaker bottle.
R**Y
Serious Mass
I’ve only gotten this product yesterday but so far I’m happy with it. Mixes fairly well in a protein blender bottle, chocolate flavor tastes smooth, and almost 700 calories per scoop. I mix it with lactaid milk and water and my body hasn’t had a problem with digesting.
M**G
Like I said 1250 calories per serving and that is ...
I work for the USPS so I walk miles and miles a day. Making it hard for me to gain or maintain a healthy weight. I eat a lot but my metabolism its too fast for me to keep up with it too. Here is what I think about this protein powder. 1. It makes you gain weight. I took it for a week every day before bed and gained from 5lbs in almost 2 weeks. I did have to mix it with other stuff just to bump up the calories count. Note that it says 1250 calories per serving that means 2 scoops of protein powder and the scoop is huge as it is. It is kind of hard to include other things other than milk because each serving has so much protein powder already that sometimes you end up with a huge huge protein shake. 2. What's in ever scoop? Whey protein, casein, vitamins, minerals, and essential fatty acids to help you pack on the pounds without gaining fat. It also delivers 1000 mg of creatine monohydrate (a nitrogenous organic acid that supplies muscles with essential fuel). Like I said 1250 calories per serving and that is if you mix it with water. If you chose milk its about 1650 calories per serving, but it varies depending on what kind of milk you prefer. 3. How does it taste... the taste is a very super rich and thick chocolate taste. I don't know how to describe it, but the taste is delicious I promise. The only reason why I didn't rate this product with 5 stars its because it kind of gets a little pricing since each package has only 16 servings. For me it works because as soon as I gain my desire weight its easy for me to keep up with it by just drinking half of the serving size once a week. Another thing that I didn't like is the bag is huge and hard to storage or to move around. I had to split mine into 3 parts. What bother me the most is the texture and form of the powder. It's very thin almost like dust (not really, but kind of). Every time I try to make a shake the powder gets all over the place because the scoop is so big for my ninja blender. So it does get messy have fun trying to make a shake right before work without getting it on your clothes or without making a mess.
T**J
Will keep this updated
Received the chocolate flavor Sept 15th and have been taking for a week and I will continuously update my results here. How does it taste? Not horribly bad but like others have said its very sweet and leaves a sweet after taste in your mouth that lasts like all day. I also feel a bit bloated at times but I feel its worth the potential gains. I'd recommend starting with 1 scoop like the bag says for your first few days to get your body used to it then bump it up to two scoops. If you can't take the two scoops cause this stuff is seriously thick do 1 scoop in the morning and 1 scoop after your workout or before bed. What tastes good with this stuff? I've found that the chocolate mixes well with peanut butter and taste pretty good plus it adds on more calories. I tried adding granola for additional calories but it just ends up either clumping together in my ball whisk or even worse you have to chew it up while its in the shake and all your taste buds can take with this stuff is drink and instantly swallow. I'll try mixing with bananas next week. The only negative things I can say about this stuff so far is that its packed with sugar, like so much sugar that I've cut out sweets from my diet while taking it no soda pop no candy, or cakes nothing sweet really. The other thing is if you work you'll have to start timing your bathroom use, I work first shift so by drinking this in the a.m I'm dropping a deuce immediately after work, I tried it at night before bed but it was very hard to concentrate on not running to the bathroom and also not fart my co-workers out of the office. Lastly and most important from what I've been reading be kind to your kidneys and drink lots of water all through out the day.
L**Z
Exelente producto
Exelente producto
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.
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.
M**I
Ottimo prodotto
Già acquistato in passato Prodotto conosciuto e di qualità
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.
M**T
Top Weight Gainer – wirkt und schmeckt 👍
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
Good quality but result after 20/25 days know
A**ー
ゲイナー
やっぱりいいです❕ 量を変えたら糖尿病の心配もないです❕ 私にはすごくあっていて 元気が出ます。 炭水化物も多く含まれるため トレーニングの後のはりもいい気がします また購入したいです❕
Trustpilot
3 weeks ago
1 month ago