Grenade Whey vs MyProtein Impact Whey.

How the numbers stack up against the price

MyProtein Impact Whey Protein Powder and Grenade Whey Protein Powder are two of the most recognised whey concentrates in the UK, and the gap between them is tighter than the brand positioning suggests. MyProtein Impact Whey Protein Powder is the established budget pick from MyProtein: 72g of protein per 100g of powder in the standard formulation, more than 40 flavour options, bag sizes from 250g to 5kg, and a near-permanent rotation of MyProtein discount codes. Grenade Whey Protein Powder is the high street friendly pick from Grenade, owned by Mondelez since 2021. The 2kg Grenade Whey delivers a higher 78g of protein per 100g, a tighter flavour range that draws on the Carb Killa heritage, and broad UK retail availability across Holland and Barrett, Tesco, Amazon UK and direct.

Grenade Whey Protein Powder edges ahead on the WheyWise composite score.

Grenade Whey 2kg posts an overall 82 versus MyProtein Impact Whey at 78, driven primarily by a stronger effectiveness score (85 vs 70) that reflects the higher protein density per 100g. Both products score equally well on value (95) once you account for the 2kg bag sizing, and the taste and ingredient component scores are level. MyProtein Impact Whey Protein Powder still wins on flavour count and code-driven sale prices that occasionally drop below Grenade on a cost per 25g of protein basis. But on the metric Kevin tracks across the WheyWise database, Grenade Whey Protein Powder is the better-performing whey concentrate for UK buyers in 2026.