MyProtein Impact Whey vs Impact Whey Isolate.

How the numbers stack up against the price

MyProtein Impact Whey Protein Powder and MyProtein Impact Whey Isolate Powder are MyProtein's two best-selling whey products and the most common upgrade question UK buyers ask. MyProtein Impact Whey Protein Powder is the original whey concentrate, delivering 72g of protein per 100g at a sale floor near £1.20 per 100g during Impact Week - the cheapest mainstream whey concentrate price in the UK in 2026. MyProtein Impact Whey Isolate Powder is the more processed whey isolate at 76g protein per 100g, with lower lactose (under 1g per 25g serving versus 2 to 3g in concentrate) and fewer carbs and fat, but priced roughly 35 to 50 percent higher per gram of protein.

MyProtein Impact Whey Protein Powder wins for most UK buyers in 2026.

The 4g per 100g protein advantage of MyProtein Impact Whey Isolate Powder is real but small, and the lactose reduction matters only for the 5 to 15 percent of UK adults with meaningful lactose sensitivity. At full RRP MyProtein Impact Whey Isolate Powder is overpriced; even on a 50 percent Impact Week code it still works out at roughly 47p per 25g of protein versus 36p for MyProtein Impact Whey Protein Powder. MyProtein Impact Whey Isolate Powder is the right pick if you are lactose intolerant, cutting macros aggressively for a competition or summer cut, or hitting close to your daily calorie limit and need the cleanest 20g protein scoop possible. For everyone else, the extra £30 to £50 per year buys 4g more protein per 100g and a marginally cleaner mouthfeel - not worth it.