Cheapest Mass Gainer in the UK
Prices updated 15 November 2026 · 5 products across 2 supermarkets
We compare mass gainer across all 9 major UK supermarkets: Tesco, Asda, Sainsbury's, Morrisons, Waitrose, Aldi, M&S, Ocado and Iceland — and rank by price per unit so you can see where mass gainer is genuinely cheapest. Prices update daily.
Optimum Nutrition Serious Mass Protein Powder Vanilla Flavou...£14.71/kg£40.002
Optimum Nutrition Serious Mass Protein Powder Chocolate Flav...£14.71/kg£40.003Optimum Nutrition Serious Mass Protein Powder Chocolate Flavour 8 Servings 2.73kg£14.71/kg£40.004Optimum Nutrition Serious Mass Protein Powder Vanilla Flavour 8 servings 2.73kg£14.71/kg£40.005
Optimum Nutrition Serious Mass Protein Powder Chocolate 1.34kg£23.81/kg£32.00Cheapest Mass Gainer: FAQ
Where is the cheapest mass gainer in the UK?
Right now the best value mass gainer is Optimum Nutrition Serious Mass Protein Powder Vanilla Flavou... at Sainsbury's, £40.00 (£14.71/kg). SmartShelf ranks mass gainer by price per unit across 2 supermarkets, updated daily.
Which supermarket is cheapest for mass gainer?
We compare mass gainer across Tesco, Sainsbury's, Asda, Morrisons, Waitrose, Aldi, M&S, Ocado and Iceland. Today Sainsbury's has the cheapest option, but the ranking updates every day as prices change.
How does SmartShelf compare mass gainer prices?
We list each product's price per unit (£/kg, £/litre or per item) so you compare like for like, and we show loyalty prices such as Clubcard and Nectar where available. Free, with no sign-up.