Contents 7 sections
What is your main goal?
How do you digest dairy?
What matters most to you?
Summarise this article with:
💡 The essentials
Our best whey isolate in October 2026 is still Nutripure’s native Whey Isolate: around 87 g of protein per 100 g (94% on a dry matter basis), under 0.2% lactose and fresh French milk.
- Best value for money: YAM Nutrition, €51/kg in the 900 g bag and €44.42/kg in the 3.6 kg bag.
- Best bought in a shop: Decathlon, 82 g of protein per 100 g and a stevia-sweetened formula.
- The criterion that matters: compare the protein figure “as sold” and the price per kilo, not the dry matter percentage.
You want to pick the best whey isolate without spending an evening decoding labels? We compared six isolates sold in France (Nutripure, Nutrimuscle, YAM Nutrition, Decathlon, Myprotein and Bulk) from their official product pages, checked in October 2026. These are French shops, so every price below is in euros.
For anyone in a hurry: Nutripure comes top of our ranking, thanks to the highest protein content in the comparison and a native whey made from French milk.
🏆 The best whey isolate ranking (October 2026)
🔬 Our method
We did not have these powders analysed in a laboratory: we compared the nutrition tables, the ingredient lists and the prices published on each brand’s official page, checked in October 2026. Four criteria, scored from 1 to 5 stars: protein per 100 g as sold, carbohydrates, price per kilo, and transparency about the origin of the milk and the process used. Nutripure is an affiliate partner of this site: it earned no extra star for it.
| Whey isolate | Protein | Carbs | Price per kilo | Origin and process |
|---|---|---|---|---|
| Nutripure Whey Isolate native | ★★★★★ | ★★★★★ | ★★★★☆ | ★★★★★ |
| YAM Nutrition Whey Isolate | ★★★★☆ | ★★★★☆ | ★★★★★ | ★★★★☆ |
| Nutrimuscle Whey Native Isolate | ★★★★☆ | ★★★☆☆ | ★★☆☆☆ | ★★★★★ |
| Decathlon Pure Whey 100% Isolate | ★★★★☆ | ★★★☆☆ | ★★★★☆ | ★★★☆☆ |
| Bulk Pure Whey Isolate | ★★★★☆ | ★★★★☆ | ★★★☆☆ | ★★☆☆☆ |
| Myprotein Impact Whey Isolate | ★★★★☆ | ★★★☆☆ | ★★★☆☆ | ★★☆☆☆ |
The protein gap between these isolates is small (from 80 to around 87 g per 100 g): what really separates them is the price per kilo, the carbohydrates and how open each brand is about its raw material.
📊 Whey isolate comparison table
| Nom | Protéines pour 100g | Glucides pour 100g | Calories pour 100g | Prix / kg (indicatif) | Notre avis 👇 |
|---|---|---|---|---|---|
| Whey Isolate Native - NUTRIPURE | 86,8g (94g sur matière sèche) | 3g | 380Kcal | autour de 47€ | Whey d'une qualité irréprochable, meilleure whey de France 🇫🇷 |
| Impact Whey Isolate - MYPROTEIN | 90g | 2,5g | 373Kcal | 54,99€ | Très bon ratio de protéines mais trop cher pour la qualité du produit. |
| Pure Whey Protéine 100% Isolate - DECATHLON | 82g | 10g | 394Kcal | autour de 40€ | Prix assez abordable mais faible qualité du produit, ne répond pas à ce qu'on attend d'une Isolate. |
| Whey Isolate Premium Protein - YAM NUTRITION | 86g | 0,5g | 358Kcal | 29,90€ | Produit le plus abordable et bon taux de proteines. |
| Pure Whey Isolate - BULK | 87g | 2g | 361Kcal | 35,28€ | Bon sur tous les aspects, mais pas le meilleur du classement. |
🥇 The 6 best whey isolates in detail
1. Nutripure Whey Isolate native: the purest
Nutripure’s native Whey Isolate states 94% protein on a dry matter basis, which works out at roughly 87% on the finished product, using the European labelling calculation that the brand spells out itself. It declares under 1% carbohydrate and fat, under 0.2% lactose, and a native whey made from fresh milk collected from French dairy co-operatives.
Price as checked: €44.90 for the 750 g pouch (€59.87/kg), €109.90 for the 2 kg tub and €189.90 for the 4 kg tub (€47.48/kg). Five flavours (unflavoured, chocolate, vanilla, hazelnut, strawberry) and a score of 4.7/5 from 1,345 customer reviews published on the brand’s own site.
Who it is for: cutting phases, stomachs that react to lactose, and anyone who wants a neutral taste they can mix into anything. Who it is not for: tight budgets buying the 750 g size, where the price per kilo lands above YAM or Decathlon.
2. YAM Nutrition Whey Isolate: the best value for money
YAM Nutrition’s Whey Isolate brings 82 to 84 g of protein per 100 g depending on the flavour, 3.5 to 4.3 g of carbohydrate and 1.5 to 2 g of fat. The brand describes it as cold-microfiltered, made from 100% French milk and fresh sweet whey straight from the dairy. Its chocolate version is sweetened with sucralose.
👉 Our full YAM Nutrition review: range, price per kilo, customer ratings and a comparison with Nutripure.
👉 Our full AM Nutrition review: range, price per kilo, customer ratings and a comparison with Nutripure.
Price as checked: €45.90 for 900 g (€51/kg), €84.90 for 1.8 kg and €159.90 for 3.6 kg (€44.42/kg), the lowest price per kilo in our selection. Only two flavours (chocolate, vanilla) and 261 customer reviews on the brand’s site.
Who it is for: anyone who wants a French isolate at the best price per kilo. Who it is not for: anyone after a native whey in the strict sense, or a neutral flavour, which the range does not offer.
3. Nutrimuscle Whey Native Isolate: the native benchmark, but dearer
Nutrimuscle’s Whey Native Isolate is a native whey produced by cold microfiltration and ultrafiltration, from an isolate supplied by the French manufacturer Ingredia. Its nutrition tables show 80 to 81.2 g of protein per 100 g depending on the flavour. It is fortified with lactase because it still contains lactose, hence 7.2 to 10.2 g of carbohydrate per 100 g.
Price as checked: €38.95 for 500 g (€77.90/kg), €70.95 for the kilo and €246.95 for 4 kg (€61.74/kg), the dearest in the comparison. The product page carries 2,271 customer reviews and publishes the certificates of analysis for its raw materials.
Who it is for: anyone who puts traceability and documentation first. Who it is not for: a strict low-carb cut, and tight budgets.
4. Decathlon Pure Whey 100% Isolate: the easiest to buy in a shop
Decathlon’s Pure Whey 100% Isolate (chocolate) brings 82 g of protein, 7.8 g of carbohydrate and 2 g of fat per 100 g. It is made in France from whey protein sourced in the European Union, sweetened with stevia, and developed to the EN 17444 anti-doping standard.
Price as checked: €48.99 for 900 g, so €54.44/kg, with a score of 4.5/5 from 656 customer reviews published on decathlon.fr. Its real advantage: you can pick it up in store, with no delivery charge.
Who it is for: anyone avoiding sucralose, or who would rather buy over the counter. Who it is not for: anyone chasing the lowest possible carbohydrates, or a native whey.
5. Bulk Pure Whey Isolate: the one for flavour choice
Bulk’s Pure Whey Isolate claims up to 26 g of protein per serving and more than ten flavours. Its unflavoured version shows 81 g of protein, 5 g of carbohydrate and 1 g of fat per 100 g. The chocolate version contains sucralose, and the product page states neither the origin of the milk nor the filtration process.
Price as checked on offer: €54.99 for 900 g (€61.10/kg) and €204.99 for 4 kg (€51.25/kg), against €62.99 for 900 g at full price. Score of 4.7/5 from the 6,913 reviews shown on the page.
Who it is for: anyone who likes to switch flavours. Who it is not for: anyone who wants to know where their milk came from.
6. Myprotein Impact Whey Isolate: only worth buying on offer
Myprotein’s Impact Whey Isolate shows 82 g of protein, 6.1 g of carbohydrate and 0.9 g of fat per 100 g (25 g of protein in a 30 g serving). The page pushes its Informed Choice certification without giving any detail on the origin of the milk.
Price as checked: €54.99 for 900 g on offer (€61.10/kg), against €83.99 at full price. At Myprotein the discounts rotate non-stop: never buy at the crossed-out price.
Who it is for: discount-code hunters. Who it is not for: anyone who buys without waiting for a promotion.
🔎 How do you spot a good whey isolate?
An isolate is a whey filtered more finely than a concentrate, richer in protein and lower in lactose and fat. For the detail of how it is made, read our article on what whey isolate is and our comparison of whey isolate vs whey concentrate.
1. The protein figure “as sold”
Aim for 80 to 90 g of protein per 100 g of powder as sold. Be wary of “dry matter” percentages: they leave out the water in the powder and inflate the number. Nutripure explains this on its own page: 94% on a dry matter basis works out at roughly 87% on the finished product under the European INCO regulation.
2. The carbohydrates and the lactose
Across our selection, carbohydrates run from under 1 g to more than 10 g per 100 g. If you are cutting, or if lactose upsets you, go for an isolate under 5 g of carbohydrate, or a whey fortified with lactase. The rest of your diet still weighs far more heavily than your shake.
3. The price per kilo, not the price of the tub
Brands sell in 500 g, 750 g, 900 g, 1 kg or 4 kg: always bring it back to the price per kilo, and compare outside short-lived promotions. The big sizes cut the price per kilo by around 13% at YAM and 21% at Nutripure.
4. The origin of the milk and the EN 17444 standard
A brand that states where its milk comes from and which process it uses (native, cold microfiltration) is far easier to compare. ANSES, the French food safety agency, advises athletes to choose products that comply with the EN 17444 standard, which covers the prevention of doping substances, and to seek advice from a healthcare professional before supplementing.
🎯 Which whey isolate should you choose for your goal?
- Cutting: Nutripure, for the lowest carbohydrates. More advice in our guide to whey isolate and weight loss.
- Lean bulking: YAM, for the price per kilo, or see our pick of the best whey protein for bulking.
- Lactose intolerance: Nutripure (under 0.2% lactose); ask a doctor if you are allergic to milk protein, because no whey is suitable in that case.
- Native whey: Nutripure or Nutrimuscle. Our article on native whey vs whey isolate explains the difference.
💬 Our verdict on the best whey isolate
If we could keep only one, it would be Nutripure’s native Whey Isolate: the richest in protein of our selection, all but lactose-free, from a brand that explains honestly the difference between dry matter and finished product. Its one genuine flaw is the price of the small size.
If budget is your priority, YAM does almost as well for less, and Decathlon is still the simplest option if you want to buy in a shop. That said, a whey isolate is not essential: if you digest lactose well and you are watching your spending, a concentrate will do, as our pick of the best whey protein across all types shows.
❓ Frequently asked questions
What is the best whey isolate?
On our comparison of the product pages, Nutripure’s native Whey Isolate is the best whey isolate in October 2026. It shows around 87 g of protein per 100 g as sold and under 0.2% lactose. YAM Nutrition offers the best price per kilo.
What is the difference between whey isolate and native whey?
“Isolate” describes a level of filtration, “native” describes an origin: fresh milk filtered cold, without going through cheesemaking. A whey can therefore be both at once, as Nutripure’s and Nutrimuscle’s are.
How much whey isolate should you take a day?
The ISSN position stand recommends 20 to 40 g of protein per serving and 1.4 to 2.0 g of protein per kilo of body weight per day for most athletes, food included. A 30 g scoop of powder brings around 24 to 25 g of protein across the pages we compared; see also when to take whey isolate.
Is whey isolate suitable if you are lactose intolerant?
It often suits people who are sensitive to lactose, because the filtration removes most of it. Pick an isolate that puts a figure on its lactose content, and ask a doctor if you are allergic to milk protein, which remains a contraindication.
