ISO-9 Whey Isolate

by Naughty Boy

Pure protein, minimal extras: filtered for maximum protein content with very low fat and carbs per serving.

Up to 27g protein per serving
Low fat - under 3g per 100g
Low carb - suitable for keto and cutting diets
Extra filtered for reduced lactose
For shakes, smoothies, baking and more

Size900g

Best price

In stock

£46.45

£5.16 / 100g

Secure retailer checkout

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Transparent protein profile

What's inside

Values per 100g, with the amount in one 30g serving

90g protein

27g per 30g serving with minimal filler

1g carbohydrates

Extremely low carbs - suitable for keto and low-carb diets

1g fat

0.3g per 30g serving - very lean

367 kcal

110 kcal per 30g serving

View full nutritional information

Nutrition per 100g and per 30g serving
Nutrient	Per 100g	Per serving (30g)
Protein	90g	27g
Calories	367 kcal	110 kcal
Carbohydrates	1g	0.3g
Fat	1g	0.3g

Know when to buy

Price history

Lowest price on record, any flavour or size

£4.33/100g (£38.99 for 900g on 18 Aug 2026)

900g · all flavours · price per pack

Amazon UKlatest £46.45, lowest £38.99, highest £46.45 in the last 90 days

Quick answers

Is this right for you?

Who is it for?

Naughty Boy ISO-9 Whey Isolate is designed for athletes, lean-bulk dieters, and anyone who wants maximum protein with minimal fat and carbs. Whey isolate is also a better option for people with mild lactose sensitivity, since the extra filtration removes most of the lactose.

What can you expect?

A lean, fast-absorbing protein with very low fat and carbohydrate content. Whey isolate goes through extra filtration to deliver 85-95% protein purity, which means more protein per scoop and fewer calories from filler. Expect quick absorption, making it ideal straight after a workout. With 90g of protein per 100g (around 27g per 30g serving), Naughty Boy ISO-9 Whey Isolate sits at the higher end for a whey isolate product.

What else do you need to know?

Naughty Boy ISO-9 Whey Isolate is a whey isolate protein powder made by Naughty Boy. It comes in 900g 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 Naughty Boy ISO-9 Whey Isolate in the UK?

We refresh Naughty Boy ISO-9 Whey Isolate 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 ISO-9 Whey Isolate contain per 100g?

ISO-9 Whey Isolate contains 90g of protein per 100g, with 27g per 30g serving. It is a whey isolate product.

Is Naughty Boy ISO-9 Whey Isolate currently in stock?

At the last check, 1 out of 1 tracked variants was in stock. Stock status carries the same fetch time as the price shown above, so check the retailer listing before ordering.