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The 10 Best Whey Isolate Protein Powder as of July 2026

Updated 2 July 2026 ยท Reviewed by the Pickarank team ยท Prices in GBP, subject to change

We compared the best whey isolate protein powder you can buy in 2026, scoring each out of 10 on performance, value, build quality and features. Here are the ten worth your money โ€” with an at-a-glance table and the current best prices.

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Our top picks at a glance

Top pick

Bulk Pure Whey Isolate 90

9.0Best overall
Check price on Amazon โ‰ˆ ยฃ30 / 1kg
Best value

MyProtein Impact Whey Isolate

8.8Best value
Check price on Amazon โ‰ˆ ยฃ30 / 1kg
Also great

Applied Nutrition Iso-XP

8.7Best for taste
Check price on Amazon โ‰ˆ ยฃ40 / 1kg

Prices were correct at the time of writing and change often โ€” tap through for today's price on Amazon.

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How we ranked these whey isolate protein powder

Each pick earns a score out of 10 from weighted criteria:

  • Performance (35%) โ€” how well each whey isolate protein does its core job.
  • Value (25%) โ€” quality and features for the price.
  • Build & reliability (20%) โ€” materials, longevity and warranty.
  • Features (20%) โ€” meaningful extras that improve the experience.

At a glance: top 10 compared

Swipe across to see all columns, including Amazon links โ†’

#Whey Isolate Protein PowderScoreBest forProtein/servingApprox. PriceAmazon links
1Bulk Pure Whey Isolate 909.0Best overall~25gยฃ30 / 1kgView Price
2Optimum Nutrition Gold Standard 100% Isolate8.9Best-known brand~25gยฃ50 / 1.6kgView Price
3MyProtein Impact Whey Isolate8.8Best value~23gยฃ30 / 1kgView Price
4Applied Nutrition Iso-XP8.7Best for taste~27gยฃ40 / 1kgView Price
5The Protein Works Whey Isolate 908.6Best flavour range~25gยฃ34 / 1kgView Price
6Reflex Micro Whey Isolate8.6Best quality~25gยฃ38 / 900gView Price
7USN Pure Protein Isolate8.5Best mixability~24gยฃ40 / 2kgView Price
8SCI-MX Pure Whey Isolate8.4Best budget isolate~24gยฃ33 / 1kgView Price
9Warrior Isolate8.3Best tasty budget~23gยฃ30 / 1kgView Price
10GoNutrition Whey Isolate 908.2Best clean-label value~24gยฃ32 / 1kgView Price

The full ranking

1
Best overall

Bulk Pure Whey Isolate 90

9.0Our number one pick.

Bulk Pure Whey Isolate 90 provides around 25g of protein per serving with very low carbs and fat, ideal for those wanting lean protein at a fair price. Isolate costs more than concentrate, but the purity and value are excellent.

Protein: 9.4Mixability: 9.0Taste: 8.6Value: 9.0
Pros
  • Very high protein per gram
  • Low carbs and fat
  • Good value isolate
Cons
  • Pricier than concentrate
  • Flavours less rich
Check price on Amazonโ‰ˆ ยฃ30 / 1kg
2
Best-known brand

Optimum Nutrition Gold Standard 100% Isolate

8.9A superb runner-up.

Gold Standard Isolate delivers around 25g of fast-absorbing, low-fat protein per serving with the brand's excellent taste and mixability. It is premium-priced, but the quality and flavour are excellent.

Protein: 9.2Mixability: 9.2Taste: 9.2Value: 8.4
Pros
  • Excellent taste and mixing
  • High-quality isolate
  • Trusted brand
Cons
  • Expensive
  • Premium pricing per kilo
Check price on Amazonโ‰ˆ ยฃ50 / 1.6kg
3
Best value

MyProtein Impact Whey Isolate

8.8Rounds out our top three.

MyProtein Impact Whey Isolate offers around 23g of lean protein per serving with low carbs and fat plus many flavours at a friendly price. Taste is good rather than premium, but the value and profile are excellent.

Protein: 9.2Mixability: 8.8Taste: 8.6Value: 9.2
Pros
  • Lean, high-protein
  • Many flavours
  • Great value
Cons
  • Flavours vary
  • Less creamy than concentrate
Check price on Amazonโ‰ˆ ยฃ30 / 1kg
4
Best for taste

Applied Nutrition Iso-XP

8.7A standout in the upper half.

Applied Nutrition Iso-XP pairs around 27g of clean isolate protein with the brand's dessert-like flavours and smooth mixing. It is pricier, but the taste and protein content are excellent.

Protein: 9.2Mixability: 9.0Taste: 9.2Value: 8.4
Pros
  • Very high protein
  • Great flavours
  • Smooth mixing
Cons
  • Premium price
  • Sweet
Check price on Amazonโ‰ˆ ยฃ40 / 1kg
5
Best flavour range

The Protein Works Whey Isolate 90

8.6A well-rounded mid-table pick.

The Protein Works Whey Isolate 90 offers around 25g of lean protein with a broad flavour selection and clean macros. Some flavours shine more than others, but the range and profile are excellent.

Protein: 9.2Mixability: 8.6Taste: 8.8Value: 8.8
Pros
  • Lean, high-protein
  • Wide flavour choice
  • Clean macros
Cons
  • Flavour quality varies
  • Mid-to-high price
Check price on Amazonโ‰ˆ ยฃ34 / 1kg
6
Best quality

Reflex Micro Whey Isolate

8.6Great value in the middle of the pack.

Reflex Micro Whey provides around 25g of high-quality isolate protein with careful processing and a clean profile. It is pricier with fewer flavours, but the quality is excellent.

Protein: 9.2Mixability: 8.6Taste: 8.4Value: 8.4
Pros
  • High-quality isolate
  • Clean profile
  • Trusted brand
Cons
  • Higher price
  • Fewer flavours
Check price on Amazonโ‰ˆ ยฃ38 / 900g
7
Best mixability

USN Pure Protein Isolate

8.5A dependable pick if the price is right.

USN's isolate mixes very smoothly with around 24g of lean protein per serving and solid flavours in value-sized tubs. It is a touch sweet, but the mixability and value are excellent.

Protein: 9.0Mixability: 9.2Taste: 8.6Value: 8.8
Pros
  • Very smooth mixing
  • Lean protein
  • Good value size
Cons
  • Sweet flavours
  • Basic branding
Check price on Amazonโ‰ˆ ยฃ40 / 2kg
8
Best budget isolate

SCI-MX Pure Whey Isolate

8.4Solid, if outshone by pricier rivals.

SCI-MX Pure Whey Isolate offers around 24g of lean protein per serving at a lower price than premium isolates. Flavour refinement is basic, but the value and protein are good.

Protein: 9.0Mixability: 8.4Taste: 8.2Value: 9.0
Pros
  • Affordable isolate
  • Lean macros
  • Everyday value
Cons
  • Basic flavours
  • Less creamy
Check price on Amazonโ‰ˆ ยฃ33 / 1kg
9
Best tasty budget

Warrior Isolate

8.3A budget-friendly option worth a look.

Warrior Isolate combines around 23g of lean protein with the brand's indulgent flavours at a keen price. Protein is slightly lower than premium isolates, but the taste and value are good.

Protein: 8.8Mixability: 8.4Taste: 8.8Value: 9.0
Pros
  • Tasty flavours
  • Lean protein
  • Affordable
Cons
  • Slightly lower protein
  • Sweet
Check price on Amazonโ‰ˆ ยฃ30 / 1kg
10
Best clean-label value

GoNutrition Whey Isolate 90

8.2Rounds out our top ten.

GoNutrition Whey Isolate 90 provides around 24g of lean protein with clean labelling and unflavoured options at a fair price. Flavours are fewer, but the value and profile are good.

Protein: 9.0Mixability: 8.4Taste: 8.2Value: 8.8
Pros
  • Clean labelling
  • Unflavoured option
  • Lean macros
Cons
  • Fewer flavours
  • Basic taste
Check price on Amazonโ‰ˆ ยฃ32 / 1kg

Frequently asked questions

What's the best of the whey isolate protein powder in 2026?

Our top overall pick is the Bulk Pure Whey Isolate 90, which leads on our combined score for performance, value and features. The Optimum Nutrition Gold Standard 100% Isolate and MyProtein Impact Whey Isolate are excellent alternatives depending on budget and needs.

How did we choose these?

We weight performance, value, build quality and features, drawing on hands-on use and independent testing. See the methodology box above for the full breakdown.

Are these prices accurate?

Prices are approximate UK figures at the time of writing and change frequently. Click through to Amazon for the current price.

The bottom line

If you just want the best whey isolate protein powder without overthinking it, the Bulk Pure Whey Isolate 90 is our top recommendation โ€” it earns the highest overall score for performance, value and features. Have a look at the current price and see what you think.

Check price on Amazon โ‰ˆ ยฃ30 / 1kg

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