Cheapest Protein Powder UK

This page ranks every protein powder we track by the single metric that matters most: how much it costs to get 25g of protein. No marketing spin, no inflated RRPs — just the actual price you pay per serving of protein, normalised across different bag sizes, brands and retailers.

We include whey concentrate, whey isolate, casein, vegan and plant-based products. The cheapest option across all types floats to the top. Whether you are looking for cheap whey protein, an affordable isolate or a budget vegan blend, use the filters to narrow by category, brand or size.

Prices are checked weekly across UK retailers including Myprotein, Bulk, Amazon UK, Holland & Barrett, Protein Works and more. Looking for the best value protein powder in the UK? The grid below makes it easy to compare inexpensive options side by side without visiting every retailer yourself.