Serious Mass Weight Gainer Protein Powder
by Optimum Nutrition
Calories that count: a high-protein, high-carb formula built for serious muscle and weight gain.
- Up to 50g protein per serving
- Low fat - under 3g per 100g
- High calorie for bulking phases
- For shakes, smoothies, baking and more
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Transparent protein profile
What's inside
Values per 100g, with the amount in one 335g serving
15g protein
50.3g per 335g serving
75g carbohydrates
251.3g per 335g serving
2g fat
6.4g per 335g serving - very lean
376 kcal
1260 kcal per 335g serving
View full nutritional information
| Nutrient | Per 100g | Per serving (335g) |
|---|---|---|
| Protein | 15g | 50.3g |
| Calories | 376 kcal | 1260 kcal |
| Carbohydrates | 75g | 251.3g |
| Fat | 1.9g | 6.4g |
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Price history
All packs and flavours · price per 100g
Quick answers
Is this right for you?
Who is it for?
Optimum Nutrition Serious Mass Weight Gainer Protein Powder is designed for hard-gainers and anyone in a dedicated bulking phase who struggles to eat enough calories. Mass gainers combine protein with carbs and calories to support weight gain and muscle growth during intense training blocks.
What can you expect?
A calorie-dense shake designed to help you gain weight. Mass gainers pack protein alongside a significant amount of carbohydrates and calories per serving. Servings tend to be larger than standard protein powders, so expect thicker shakes and bigger scoops. With 15g of protein per 100g (around 50g per 335g serving), Optimum Nutrition Serious Mass Weight Gainer Protein Powder sits in a competitive position for a mass gainer product.
What else do you need to know?
Optimum Nutrition Serious Mass Weight Gainer Protein Powder is a mass gainer protein powder made by Optimum Nutrition.. Every price on WheyWise is read from the retailer’s own page and re-checked daily and sorted by cost per 100g, so you can see both the cheapest option and how current it is. All links to Amazon and retailer sites are affiliate links - this is how WheyWise stays free.
Frequently asked questions
Where is the cheapest place to buy Optimum Nutrition Serious Mass Weight Gainer Protein Powder in the UK?
We refresh Optimum Nutrition Serious Mass Weight Gainer Protein Powder pricing daily from Amazon UK and show the fetch time next to every figure. If no verified price is showing above, we do not currently hold one we would stand behind, and the buy button will take you to the live listing to check.
How much protein does Serious Mass Weight Gainer Protein Powder contain per 100g?
Serious Mass Weight Gainer Protein Powder contains 15g of protein per 100g, with 50.3g per 335g serving. It is a mass gainer product.
Is Optimum Nutrition Serious Mass Weight Gainer Protein Powder currently in stock?
At the last check, 0 out of 0 tracked variants were in stock. Stock status carries the same fetch time as the price shown above, so check the retailer listing before ordering.
Where to buy in the UK
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