Optimum Nutrition Serious Mass
Classic mass gainer — 1,260 calories, 50g protein, and creatine per serving.
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Nutrition Facts
Nutrition Facts
Key Details
Pros
- 1,260 calories per serving for genuine hardgainers
- 50g protein plus creatine and glutamine included
- Banned-substance tested
- Far cheaper than eating the equivalent in food
Cons
- 252g carbs per serving is mostly maltodextrin
- Only 16 full servings per 12 lb bag
- Massive 334g serving needs a blender
- Completely wrong tool for anyone not bulking
AI Analysis
Serious Mass is a specialist tool with one job: adding calories to people who cannot eat enough to gain weight. The numbers are deliberately extreme — a full two-scoop serving mixed in milk approaches 1,640 calories, and even in water it delivers 1,260 calories with 50g of protein, 252g of carbohydrates, 3g of creatine, and added glutamine and 25 vitamins and minerals.
For genuine hardgainers — teenagers with racing metabolisms, tall skinny lifters, athletes in aggressive bulks — it solves a real problem more cheaply and conveniently than force-feeding whole food. Optimum Nutrition's manufacturing quality and banned-substance testing also put it above the gray-market gainers that dominate this category.
Everyone else should scroll past. The carbohydrate load is mostly maltodextrin, a fast-digesting starch that spikes blood sugar, and the 20g of sugar and modest 50g of protein per 1,260 calories make it catastrophically wrong for anyone watching their weight. Our purity score reflects that this is engineered calorie delivery, not clean nutrition. Used for its intended purpose, though, it has been the category king for two decades for a reason.
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