Whey isolate goes through additional filtering to remove most of the fat and lactose, resulting in a high quality protein source that is typically 90% or more protein by weight. It delivers a complete amino acids profile — including all essential amino acids needed for muscle repair and recovery — making it the go-to choice for people on a strict calorie budget, those with mild lactose sensitivity, or anyone who wants maximum protein per scoop.

We track whey isolate products across UK retailers, all normalised to price per 100g so you can compare fairly regardless of bag size or serving suggestion. You will typically pay more per 100g than concentrate, but you are getting significantly more high quality protein per gram of powder.

If budget is your main concern and you tolerate lactose well, whey concentrate may be the better value option. For a completely dairy-free alternative, browse our vegan protein comparison.

Compare Other Protein Types

Whey Concentrate Vegan Casein Mass Gainer Plant Blend Cheapest Overall Best Under £30 Best Under £50 Best for Weight Loss Myprotein vs Bulk ON vs Myprotein

Shop by goal

Pick a target, see the shortlist.

Cheapest Overall

Lowest £/25g across every protein type

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Best for Weight Loss

Low-carb, low-sugar picks by £/25g

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Clear Whey

Lighter, juice-style whey isolates

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Brand battles

Two brands, one clear winner.

Myprotein vs Bulk

The UK's two biggest DTC brands, head-to-head

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ON vs Myprotein

Premium global vs budget UK favourite

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Power users

Advanced comparison: every product, filtered

Dense table view with every product, full filter sidebar, and no editorial surfaces.

Tracking 98 UK retailers

Optimum NutritionApplied NutritionThe Protein WorksGrenadeUSNReflex NutritionBulkMyProteinFormHuelHolland & BarrettAmazonBootsTescoSainsbury’sMyveganMuscle FoodProtein DynamixPhDWarriorOptimum NutritionApplied NutritionThe Protein WorksGrenadeUSNReflex NutritionBulkMyProteinFormHuelHolland & BarrettAmazonBootsTescoSainsbury’sMyveganMuscle FoodProtein DynamixPhDWarrior

Methodology

How we rank every bag.

Independent, transparent, and updated weekly. Here's what goes into each score.

01

Cost normalised to £/25g

Every bag divided by its true protein weight, so you see the real cost of a scoop across any size or brand.

02

Protein quality, not just %

Protein %, leucine and digestibility feed the Performance score. A 90% isolate and a 90% vegan blend are not the same.

03

Clean-label audit

Ingredient count, artificial sweeteners, added sugars, third-party certifications. 0 to 100 score.

04

Social and review signals

Weekly purchase volume and weighted review scores surface what people actually re-buy, not just what ranks on search.

Questions, answered.

Whey concentrate contains 70-80% protein with some fat and lactose. Whey isolate is filtered further to 90%+ protein with minimal fat and lactose, making it better for those who are lactose intolerant or want a leaner protein source.

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