Serious Mass Gainer
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
Best price today
In stock5.45kg · Serious
£62.43
£1.15 / 100g
Secure retailer checkout
No verified price on record98 in stock
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Nutritional profile
What's inside
Values per 100g
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
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
Pick your pack
3 sizes · ranked by cost per 100gThe 5.45kg works out at £1.05 per 100g. The 1.34kg costs £1.90. Same powder, 1.8x the price per gram.
Frequently asked questions
Where is the cheapest place to buy Optimum Nutrition Serious Mass Gainer in the UK?
We refresh Optimum Nutrition Serious Mass Gainer 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 Gainer contain per 100g?
Serious Mass Gainer contains 15g of protein per 100g, with 50.3g per 335g serving. It is a mass gainer product.
Is Optimum Nutrition Serious Mass Gainer currently in stock?
At the last check, 98 out of 144 tracked variants were in stock. Stock status carries the same fetch time as the price shown above, so check the retailer listing before ordering.
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