Optimum Nutrition Serious Mass, Weight Gainer Protein Powder with Creatine
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Availability:
In Stock.
Arrives
Monday, Sep 15
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Flavor Name: Chocolate
Size: 6 Pound (Pack of 1)
Features
- HIGH CALORIE WEIGHT GAINER: More than 1,200 calories per 2-scoop serving
- 50 grams of blended protein per 2-scoop serving
- Over 250 grams of carbohydrates per 2-scoop serving
- With over 20 vitamins and minerals including Vitamin C and Zinc to provide immune support
- MORE VERSATILITY: Using an electric blender, add fresh or frozen fruits, peanut butter, nuts, and other calorie dense foods to boost your weight gain potential
Description
Optimum Nutrition Serious Mass, Weight Gainer Protein Powder with Creatine
Date First Available : January 31, 2024
Best Sellers Rank: #2,831 in Health & Household (See Top 100 in Health & Household) #2 in Sports Nutrition Weight Gainers #383 in Sales & Deals
#2 in Sports Nutrition Weight Gainers:
#383 in Sales & Deals:
Customer Reviews: 4.5 4.5 out of 5 stars 40,749 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Sep 15
This item is non-returnable:
Non-returnable due to Food safety reasons
View our full returns policy here.
Non-returnable due to Food safety reasons
View our full returns policy here.
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Top Amazon Reviews
Flavor Name: Vanilla
Size: 6 Pound (Pack of 1)
I’ve been using Optimum Nutrition Serious Mass for a while now and keep coming back to it because it delivers consistent results. It’s a great weight gainer with plenty of calories and protein to help me build muscle and add mass. The added creatine is a nice bonus, supporting my strength gains and recovery. The taste mixes well and isn’t too sweet or chalky, which is a plus compared to other mass gainers I’ve tried. If you’re looking for a dependable product to help with weight gain and muscle building, I’d definitely recommend Serious Mass. I’ve bought it over and over again and plan to keep doing so!
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Reviewed in the United States on July 13, 2025 by James O'Malley
Flavor Name: Vanilla
Size: 6 Pound (Pack of 1)
I picked this a couple of summers ago to help keep weight on me. I tend to lose a lot of weight in the summer because I work outside a lot. This year was no exception and this stuff is absolutely amazing! It mixes up so well, I can work out with it, which helps build muscle, it helps my energy level levels., The ingredients are everything you need in a daily supply and the taste is great. I always mix mine with frozen fruit or peanut butter.!
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Reviewed in the United States on July 9, 2025 by Casey
Flavor Name: Vanilla
Size: 6 Pound (Pack of 1)
I've been taking Serious Mass twice a day — once after my workouts and again before bed — and I’ve already noticed a big difference. I feel stronger, more energized, and I’m finally putting on the weight I’ve been working for. It mixes easily, tastes great with milk, and doesn’t leave me feeling too full or bloated. It’s packed with calories, protein, and nutrients — perfect for my busy schedule and night shifts. If you’re serious about gaining mass the healthy way, this is 100% worth it. Stay consistent and you’ll see results! 💪🏾🔥 #MassGainer #SeriousMass #MuscleGrowth #WeightGainJourney
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Reviewed in the United States on June 14, 2025 by Phaelle Guillaume
Flavor Name: Banana
Size: 6 Pound (Pack of 1)
I’ve been using this Mass gainer for some time now , and it’s made a real difference. The banana flavor is actually pretty tasty and mixes well — no clumps! I like that it includes extra vitamins like C and zinc, plus creatine for recovery. It’s helped me get those extra calories in when I’m short on time, and I’ve already noticed weight gain and improved energy for my workouts. Definitely recommend if you’re looking to bulk up
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Reviewed in the United States on May 30, 2025 by Currie
Flavor Name: Chocolate
Size: 6 Pound (Pack of 1)
My son has been using Optimum Nutrition Serious Mass for a few weeks and he loves it. Each serving is packed with over 1,200 calories, which makes it easy to hit your daily intake goals without force-feeding. The Chocolate flavor blends well with milk. He didn’t milk the taste when mixed with water. Just a heads-up—start with half a serving if you’re new to weight gainers.
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Reviewed in the United States on July 27, 2025 by Jasmin
Flavor Name: Chocolate
Size: 6 Pound (Pack of 1)
The media could not be loaded. I’ve been using Optimum Nutrition’s Serious Mass Gainer for a few weeks now, and it’s been a great addition to my muscle-building routine. The price is very affordable for the amount of calories and protein you get, making it a solid value. The shipment arrived on time, and the product was in perfect condition. Each serving provides 1,250 calories (with milk) and 50 grams of protein, which has really helped me achieve a calorie surplus and gain muscle. The flavor is fantastic, especially the chocolate, and the texture is incredibly smooth—no clumps or graininess. It’s easy to mix, and I love that it feels like a hearty, satisfying meal replacement. While it can be a bit sweet for some, it’s not a dealbreaker for me. Overall, if you’re looking for an effective, affordable, and tasty mass gainer, Serious Mass is definitely worth trying.
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Reviewed in the United States on March 30, 2025 by Michael Gordon Michael Gordon
Flavor Name: Vanilla
Size: 6 Pound (Pack of 1)
This is the first time I’ve actually finished a full container of a mass gainer, and while it helped me gain about 5 lbs (alongside eating more), I had some struggles with it too. I got the vanilla flavor, and it was extremely sweet—to the point where it felt like a sugar coma every time I drank it. I normally don’t eat sweets, so I believe this sudden sugar intake caused a noticeable acne breakout on my face. Like most gainers, it’s heavy on the stomach and made me feel bloated for hours, which made it hard to eat proper meals after having a shake. That said, it does mix very well with no clumps, and the texture is smooth and creamy. I’m not sure if vanilla is just the sweetest flavor, but I’m hesitant to repurchase unless I try a different one or find a cleaner option. It works, but there are trade-offs.
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Reviewed in the United States on May 11, 2025 by Haneen Haneen
Flavor Name: Vanilla
Size: 6 Pound (Pack of 1)
Why did you pick this product vs others?: It works, not my first time getting this Taste: It taste really well, and it doesn’t have a funny smell which is a plus
Reviewed in the United States on July 11, 2025 by Sherika ☺️😍