Optimum Nutrition Serious Mass Review (2026)
The classic high-calorie gainer: 1,250 calories and 50g protein per full serving for hardgainers who struggle to eat enough.
Our Verdict
Value 8/10 Performance 8/10 ★★★★☆
Best for: True hardgainers who cannot eat enough whole food.
Check Optimum Nutrition Price on Amazon →Overview
Optimum Nutrition Serious Mass from Optimum Nutrition competes in the mass gainers category, where it earns our "Best Overall Gainer" pick. The classic high-calorie gainer: 1,250 calories and 50g protein per full serving for hardgainers who struggle to eat enough.
In our evaluation framework we weigh formula or build quality, real-world usability, third-party testing or ratings where available, and — heavily — cost per serving or cost per use, because the best product is the one you can afford to use consistently for months.
Pros and Cons
What We Like
- 1,250 calories per serving
- 50g protein + 250g carbs
- 25 vitamins & minerals added
What We Don’t
- Huge 2-cup serving size
- High sugar content
- Best split into half servings
Specifications
| Calories | 1,250 |
|---|---|
| Protein | 50g |
| Carbs | 250g |
| Servings | 8–16 |
Who It’s For
True hardgainers who cannot eat enough whole food.
Who Should Avoid It
Anyone who gains fat easily — eat whole food first.
How It Compares
Here is Optimum Nutrition Serious Mass against the other mass gainers picks we recommend:
| Product | Best For | Calories | Protein | Carbs | Servings | Score | |
|---|---|---|---|---|---|---|---|
| Optimum Nutrition Serious Mass Best Overall Gainer |
True hardgainers who cannot eat enough whole food. | 1,250 | 50g | 250g | 8–16 | 4.0/5 | Amazon → |
| Dymatize Super Mass Gainer Cleaner Formula |
Skinny lifters bulking hard. | 1,280 | 52g | 246g | ~8 | 3.8/5 | Amazon → |
| Rival Nutrition Clean Gainer Best Clean Gainer |
Lean bulkers who want calories without junk. | 560 | 30g | 90g | ~15 | 3.8/5 | Amazon → |
| Naked Mass Weight Gainer Cleanest Label |
Clean-label bulkers who blend their own smoothies. | 1,250 | 50g | 252g | 11 | 4.0/5 | Amazon → |
| MuscleTech Mass-Tech Extreme 2000 Best With Creatine |
Extreme hardgainers and heavyweight athletes. | 2,000+ | 80g | 400g | varies | 3.5/5 | Amazon → |
Scores are our editorial ratings. Prices change frequently — always check the live Amazon listing.
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See Optimum Nutrition Serious Mass on Amazon →Frequently Asked Questions
Is Optimum Nutrition Serious Mass good for beginners?
Optimum Nutrition Serious Mass suits true hardgainers who cannot eat enough whole food. Its main trade-offs: huge 2-cup serving size and high sugar content If those don't apply to you, it's a solid choice in the mass gainers category.
Where is the best place to buy Optimum Nutrition products?
Amazon typically offers competitive pricing, fast shipping, and easy returns on Optimum Nutrition products. Prices change frequently, so compare the current Amazon listing against the brand's own site before buying.
Is Optimum Nutrition Serious Mass safe?
It is a mainstream product from an established brand, and this category is widely used by healthy adults. That said, supplements are not FDA-approved before sale — consult a healthcare professional before starting any supplement, especially if you are under 18, pregnant, taking medication, or have a medical condition.
Related Products
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Body Fortress Super Advanced Whey
A budget whey sold in big-box stores with a surprisingly strong 30g protein per serving at one of the lowest prices per gram.
MuscleTech Nitro-Tech Whey
Whey isolate and peptides plus 3g creatine per scoop — two staples in one tub, with standout flavors.
Disclosure & disclaimer: As an Amazon Associate we earn from qualifying purchases. This review is educational, reflects our editorial opinion, and is not medical advice — consult a healthcare professional before starting any supplement or exercise program.