Whey Concentrate vs Whey Isolate
Whey concentrate vs whey isolate — the most asked protein question in the UK. The label gap is real; the practical gap is smaller than the price gap.
Whey concentrate
The original whey: filtered enough to hit ~70–80% protein while keeping some lactose, milk fat and flavour. The best value protein on the market.
Whey isolate
Whey filtered further to 80–90%+ protein, stripping out most lactose and fat. Leaner macros, higher price, easier digestion.
Our verdict
Isolate wins the label; concentrate wins the wallet
On pure numbers, isolate takes it: our representative isolate packs 82g vs 67g protein per 100g and 20% more leucine (8.69g vs 7.26g) — the filtration that removes lactose and fat concentrates everything you want.
But the price gap is far bigger than the nutrition gap. Concentrate delivers ~90% of the result for much less money, and for anyone without lactose sensitivity, the extra 15g per 100g rarely changes outcomes — total daily protein dominates.
Verdict: isolate if you're lactose-sensitive or cutting hard; concentrate for everyone else. The smart money is on concentrate.
The difference
Whey concentrate
The original whey: filtered enough to hit ~70–80% protein while keeping some lactose, milk fat and flavour. The best value protein on the market.
- ✓~70–80% protein by weight (our rep: 67g per 100g)
- ✓Retains some lactose and milk fat — creamier taste
- ✓Cheapest cost per gram of protein
- ✓Leucine 7.26g per 100g in our representative
Whey isolate
Whey filtered further to 80–90%+ protein, stripping out most lactose and fat. Leaner macros, higher price, easier digestion.
- ✓~80–90%+ protein by weight (our rep: 82g per 100g)
- ✓Most lactose removed — the digestion-friendly choice
- ✓Leucine 8.69g per 100g in our representative (+20% vs concentrate)
- ✓Hydrolysed isolates (like ISO100) go a step further
Top-rated picks, live
The highest efficiency scorers in our catalog for each side, right now.
Whey concentrate
Who should buy which
Buy concentrate if…
You tolerate dairy fine and want the best protein-per-pound on the market. The rational default for most people.
Buy isolate if…
You're lactose-sensitive, cutting hard, or you want the leanest macros regardless of cost. The premium is real and so is the product.
Frequently asked
Is whey isolate better than concentrate?
On the label, yes: more protein per 100g (typically 80–90g vs 70–80g), less lactose, slightly more leucine. Whether it's worth the premium depends on your budget and digestion.
Does isolate have less lactose?
Yes — the extra filtration removes most of the lactose and fat. That's the main practical reason to choose it over concentrate.
Can I mix them?
Many blends already do — 'whey protein' on most labels is a concentrate/isolate blend. Buying them separately just lets you control the ratio (and the price).
Compare specific products yourself
Concepts are useful — labels decide. Run any whey concentrate against any whey isolate in the interactive compare tool.
Open compare tool →More rivalries
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