Myprotein vs Optimum Nutrition: Impact Whey or Gold Standard?

Myprotein Impact Whey and Optimum Nutrition Gold Standard 100% Whey are both familiar everyday powders. The branding suggests a straightforward budget-versus-premium contest. The labels give a more useful picture: Myprotein's chosen Maple Syrup flavour is concentrate-led, while Gold Standard Chocolate Hazelnut uses a blend with isolate first, followed by concentrate and hydrolysed isolate.

Neither formula is automatically the better buy for everyone. A flavour, ingredient preference or retailer offer can matter as much as the brand name. We checked one named flavour and one near-1kg pack from each brand so the comparison has a real starting point.

On 24 September 2026, Myprotein showed 1kg Maple Syrup Impact Whey at £32.99. Its label gave 78g protein per 100g, making 25g of protein cost roughly £1.06. Optimum Nutrition showed 896g Chocolate Hazelnut Gold Standard at £50. That label gave 75g protein per 100g, making the same 25g of protein cost roughly £1.86.

The ON bag is smaller and dearer at these direct prices. Its isolate-first blend may appeal if that ingredient order matters to you, but it does not deliver more protein per 100g in this exact flavour match. The live Myprotein versus Optimum Nutrition comparison can surface retailer discounts that change the checkout result.

Gold Standard's ingredient list starts with whey isolate, then whey concentrate and hydrolysed isolate. Myprotein's Impact Whey is sold as a whey concentrate product. If you are paying the ON premium for its blend, that is the actual difference to look for, not an imagined leap in protein content.

Both brands sell many flavours. The nutrition panel changes with flavour, and ON's serving is about 32g while the chosen Myprotein serving is 25g. Comparing the two front-of-pack 'grams per scoop' numbers without noting the scoop sizes would make Gold Standard look richer than the table shows.

We would buy Impact Whey for routine shakes at these direct prices. Gold Standard makes more sense for someone who specifically wants its blend or favourite flavour and finds a retailer offer that narrows the gap. Do not pay the full premium on the assumption that it necessarily contains more protein than Impact Whey; the flavour-specific labels here show the opposite by weight.

Our Gold Standard price guide focuses on finding that product cheaper. The Myprotein value guide covers the wider brand catalogue. This article is the narrower decision between these two flagship powders.