Quick answer
Whey protein isolate is whey that has been filtered further to strip out most of the fat and lactose, so each scoop carries more protein. Myprotein Impact Whey Isolate has 82g of protein per 100g in Vanilla, against 72g for standard Impact Whey, but it costs £1.66 per 25g of protein in the 900g bag against £1.27, checked 3 October 2026. WheyWise read both labels and prices on myprotein.com: pay the 30% extra if you want the leanest scoop or standard whey upsets your stomach, otherwise standard whey is the better buy.
Whey protein isolate is the same milk protein as standard whey, filtered harder. The extra filtering takes out most of the fat and lactose, which lifts the protein to 82g per 100g in Myprotein Impact Whey Isolate Vanilla, against 72g in standard Impact Whey Vanilla, checked on myprotein.com on 3 October 2026.
What is whey protein isolate?
Whey protein isolate is whey protein that has been filtered further than standard whey (sold as whey concentrate), leaving a powder with more protein and less fat, carbohydrate and sugar per 100g. Myprotein describes Impact Whey Isolate as ultrafiltered, with higher protein and reduced lactose compared with its standard whey. The protein itself is still whey, so it digests quickly and is a complete protein in the same way. What you are paying for is purity per scoop, not a different kind of protein.
What is the difference between Impact Whey and Impact Whey Isolate?
Myprotein Impact Whey Isolate has 10g more protein per 100g than Impact Whey and a fraction of the fat, but it costs 30% more per gram of protein in the 900g bag. Here are the two Vanilla labels and one-off prices side by side.
| Vanilla | Impact Whey | Impact Whey Isolate |
|---|---|---|
| Protein per 100g | 72g | 82g |
| Protein per 30g scoop | 22g | 25g |
| Fat per 100g | 5.9g | 0.9g |
| Sugars per 100g | 5.1g | 1.9g |
| 900g bag | £32.99 | £48.99 |
| Cost per 25g of protein | £1.27 | £1.66 |
Labels and one-off prices checked 3 October 2026 on myprotein.com, before any discount code. Myprotein's Unflavoured isolate label is higher again, at 86g of protein per 100g.
Is whey isolate lactose free?
No, whey isolate is lower in lactose but not lactose free, and Myprotein says so on its own product page. Lactose is a sugar, so the sugars line caps it: a 30g scoop of Impact Whey Isolate Vanilla has 0.6g of total sugars, against 1.5g in Impact Whey Vanilla. A systematic review by Shaukat et al., 2010 found most adults with lactose intolerance tolerate 12g to 15g of lactose, so plenty of people who react to milk are fine on either. Isolate is the safer bet if you have tried standard whey and it still bloated you. Neither is suitable for a milk allergy.
Who should buy whey isolate?
Buy whey isolate if you are counting fat and carbohydrate closely, want 25g of protein from a smaller scoop, or find standard whey hard on your stomach. Skip it if you just want protein for the lowest price: standard whey does the same job for 39p less per 25g of protein at 900g. To see every isolate ranked by cost per 25g of protein, use the whey isolate price comparison, and for our picks read the best whey isolate UK guide.
Leaner than standard whey
MyProtein Impact Whey Isolate Powder
900g bag
The isolate version of Myprotein's best seller: 10g more protein per 100g than Impact Whey, for a 30% premium per gram of protein.
or compare all UK prices →Leaner than standard whey
Pros
- + 82g of protein per 100g in Vanilla, 25g in a 30g scoop
- + 0.9g of fat and 1.9g of sugars per 100g
- + Informed Choice certified, according to myprotein.com
Cons
- – £1.66 per 25g of protein in the 900g bag, 30% more than Impact Whey
- – Lower in lactose but not lactose free
●Nutrition per scoop · 24.6g protein in 30g▼
Protein makes up 82%
of this 30g scoop · 108 kcal total
Frequently asked questions
Is whey isolate better than whey protein?
Whey isolate has more protein and less fat and sugar per scoop, but it is not better for muscle in any way that justifies paying more by default. Myprotein Impact Whey Isolate has 82g of protein per 100g in Vanilla against 72g for Impact Whey, and costs £1.66 per 25g of protein in the 900g bag against £1.27, checked 3 October 2026. It is worth the extra if you want the leanest shake or standard whey disagrees with you.
Is whey protein isolate lactose free?
No. Myprotein says its Impact Whey Isolate contains less lactose than standard whey but is not completely lactose free. A 30g scoop of the Vanilla flavour has 0.6g of total sugars, against 1.5g in Impact Whey Vanilla, checked 3 October 2026. It is still a milk product, so it is not suitable for a milk allergy.
How much protein is in a scoop of whey isolate?
A 30g scoop of Myprotein Impact Whey Isolate in Vanilla gives 25g of protein, according to the label on myprotein.com, checked 3 October 2026. The same 30g scoop of standard Impact Whey Vanilla gives 22g.