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Optimum Nutrition Serious Mass is a high-calorie, high-protein weight gainer designed for serious muscle builders. Each serving delivers 1,250 calories, 50 grams of blended whey protein, and over 250 grams of carbohydrates with no added sugar, complemented by 25 essential vitamins and minerals plus performance enhancers like creatine and glutamine. Ideal for post-workout recovery and sustained muscle growth, it also supports immune health with Vitamin C, Zinc, and Vitamin D.






| ASIN | B000GIPJ02 |
| Age Range Description | Adult |
| Allergen Information | Eggs, Milk, Soy, Wheat |
| Best Sellers Rank | #6,642 in Health ( See Top 100 in Health ) #1,602 in Multiple Vitamin-Mineral Combination Supplements |
| Brand | Optimum Nutrition |
| Brand Name | Optimum Nutrition |
| Caffeine Content Description | Caffeine Free |
| Country of Publication | USA |
| Customer Reviews | 4.4 out of 5 stars 19,115 Reviews |
| Diet Type | Vegetarian |
| Diet type | Vegetarian |
| Flavor | Vanilla |
| Flavour | Vanilla |
| Item Dimensions | 29.2 x 14 x 40.6 centimeters |
| Item Weight | 192 Ounces |
| Item weight | 192 Ounces |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer Part Number | 1031920 |
| Material Type Free | Finished Product |
| Material type free | Finished Product |
| Model Name | Optimum Nutrition Serious Mass Weight Gainer Protein Powder Vitamin C Zinc and Vitamin D for Immune Support |
| Model Number | 1031920 |
| Net Content Volume | 13.88 Liters |
| Number of Items | 1 |
| Package Type Name | Bottle |
| Product Benefits | High Calorie, High Protein formula for Muscle and Mass Gain Support |
| Protein Source | Whey |
| Recommended Uses For Product | Post-Workout |
| Servings per container | 16 |
| Supplement Formulation | Multi-Supplement |
| Total Servings Per Container | 16 |
| UPC | 748927023824 |
| Unit Count | 5440 Grams |
R**L
Works well for what it is
I bought this mass gainer two months so I can gain weight and put on muscle mass. Let me tell you it worksssss! Over the two months I’ve been taking it I’ve noticed noticeable size gains across my entire body. Though one thing if you were to take this and not train with intensity you’ll gain fat but me since I train five days a week with high intensity per session this mass gainer works very well as my post workout shake and helped significantly to put on muscle mass as well.
B**E
Fast delivery
Not sweet if you are someone who like tasty things though for me i don't use sugar so i prefer the taste cause before i was using other brand and i had to really dilute to reduce the sweetness, just received it today so lets see if it does what is written
R**I
Good taste
Original product
A**S
Good for weight gain
Like the test and good result
N**N
It's good
Result is very good work well
B**V
Thanku
Thank u so much
A**L
Than you
Thank you, I’ll use useful
M**M
Vanilla tastes awful
I bought the vanilla flavor and it’s one of the worse mass gainers I have drank, the after taste is very bad makes me gag. I have the full bottle and I can’t even return it
Trustpilot
1 month ago
2 weeks ago