Xtreme Mass Gainer

by Prozis

Calories that count: a high-protein, high-carb formula built for serious muscle and weight gain.

Up to 63g protein per serving
Low fat - under 3g per 100g
High calorie for bulking phases
For shakes, smoothies, baking and more

Choose flavour4 flavours

Flavour pictures illustrate the taste, not the powder's colour or ingredients.

Choose sizeBest value per 100g: 5.44kg

Best price today

In stock

£44.93

£0.83 / 100g

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Transparent protein profile

What's inside

Values per 100g, with the amount in one 334g serving

19g protein

63.5g per 334g serving

73g carbohydrates

243.8g per 334g serving

2g fat

6g per 334g serving - very lean

384 kcal

1283 kcal per 334g serving

View full nutritional information

Nutrition per 100g and per 334g serving
Nutrient	Per 100g	Per serving (334g)
Protein	19g	63.5g
Calories	384.2 kcal	1283 kcal
Carbohydrates	73g	243.8g
Fat	1.8g	6g

Know when to buy

Price history

Lowest price on record, any flavour or size

£0.83/100g (£44.93 for 5.44kg on 13 Oct 2026)

5.44kg · all flavours · price per pack

Prozislatest £44.93 (one check so far)

Quick answers

Is this right for you?

Who is it for?

Prozis Xtreme Mass Gainer 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 19g of protein per 100g (around 63g per 334g serving), Prozis Xtreme Mass Gainer sits in a competitive position for a mass gainer product.

What else do you need to know?

Prozis Xtreme Mass Gainer is a mass gainer protein powder made by Prozis. It comes in 2.72kg, 5.44kg sizes. 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 Prozis Xtreme Mass Gainer in the UK?

The best price we have verified today is £0.83 per 100g for the 5.44kg bag, checked 13 Oct 2026. Use the buy button above to go straight to it.

How much protein does Xtreme Mass Gainer contain per 100g?

Xtreme Mass Gainer contains 19g of protein per 100g, with 63.5g per 334g serving. It is a mass gainer product.

Is Prozis Xtreme Mass Gainer currently in stock?

At the last check, 8 out of 8 tracked variants were in stock. Stock status carries the same fetch time as the price shown above, so check the retailer listing before ordering.