Product Highlights
Shipping: Varies by retailer Plant-based: No Third-Party: Not disclosed
Manufacturer: Categories: Mass Gainer, SupplementsIn-Depth Review
Optimum Nutrition Serious Mass Review (2026): Is This Popular Weight Gainer Worth the Hype?
Author: Destini Moody, RD, CSSD, LDIn this Optimum Nutrition Serious Mass review, a sports dietitian breaks down the pros and cons of one of the internet’s most popular weight gainers. Read the full review.
Pros & Cons
Pros
- Provides 1,250 calories in a full serving
- Delivers 50 grams of protein per serving
- Includes 3 grams of creatine
- Available in several familiar flavors
Cons
- Contains more than 250 grams of carbohydrates per serving
- Full serving requires two large scoops
- Uses artificial flavors and sweeteners
- No product-specific third-party certification is disclosed
Specs
| Flavors | Chocolate, Chocolate Peanut Butter, Strawberry, and Vanilla |
|---|---|
| Calories per serving | 1,250-1,260 |
| Protein per serving | 50 g |
| Shipping | Free shipping |
| Shipping details | Free shipping and 20% off Subscriptions |
| Warranty | 60 days |
| Returns | Free returns |
Product Summary
Optimum Nutrition Serious Mass combines 1,250 calories, 50 grams of protein, and added creatine for people who struggle to eat enough while bulking. However, its massive carbohydrate load and oversized serving may be more than some users need or tolerate comfortably.
