Diet Fuel Ultralean
by USN
A complete shake built to replace a meal, not just top up protein.
- Up to 24g protein per serving
- Built to replace a meal, with carbs, fibre and added vitamins
- For shakes, smoothies, baking and more
Flavour pictures illustrate the taste, not the powder's colour or ingredients.
Best price today
In stock£22.41
£2.24 / 100g
Secure retailer checkout
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Transparent protein profile
What's inside
Values per 100g, with the amount in one 55g serving
44g protein
24.2g per 55g serving
30g carbohydrates
16.5g per 55g serving
7g fat
3.6g per 55g serving - moderate fat
367 kcal
202 kcal per 55g serving
View full nutritional information
| Nutrient | Per 100g | Per serving (55g) |
|---|---|---|
| Protein | 44g | 24.2g |
| Calories | 367 kcal | 202 kcal |
| Carbohydrates | 30g | 16.5g |
| Fat | 6.6g | 3.6g |
Know when to buy
Price history
Lowest price on record, any flavour or size
£1.45/100g (£14.49 for 1kg on 18 Oct 2026)
1kg · all flavours · price per pack
- Amazon UKlatest £22.41, lowest £14.49, highest £27.00 in the last 90 days
Quick answers
Is this right for you?
Who is it for?
USN Diet Fuel Ultralean is designed for anyone who wants a quick, calorie-controlled shake to replace a meal, with protein, carbohydrate, fibre and added vitamins and minerals rather than protein alone.
What can you expect?
A shake built to stand in for a meal. Meal replacements carry less protein per 100g than a standard protein powder, because the rest of each serving is carbohydrate, fibre and fats, with vitamins and minerals added. Check the calories per serving against the meal you are replacing. With 44g of protein per 100g (around 24g per 55g serving), USN Diet Fuel Ultralean sits in a competitive position for a meal replacement product.
What else do you need to know?
USN Diet Fuel Ultralean is a meal replacement protein powder made by USN. It comes in 1kg, 2kg 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 USN Diet Fuel Ultralean in the UK?
We refresh USN Diet Fuel Ultralean 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 Diet Fuel Ultralean contain per 100g?
Diet Fuel Ultralean contains 44g of protein per 100g, with 24.2g per 55g serving. It is a meal replacement product.
Is USN Diet Fuel Ultralean currently in stock?
At the last check, 11 out of 12 tracked variants were in stock. Stock status carries the same fetch time as the price shown above, so check the retailer listing before ordering.
Pick your pack
2 sizes · any flavour · cost per 100g for each
The 2kg works out at £1.95 per 100g. The 1kg costs £2.24. Same powder, 1.1x the price per gram.
Where to buy in the UK
Any flavour · 1kg · 5 offers for this selection · sorted by cost per 100g
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