Cheapest Protein Bars in the UK

Prices updated 15 August 2026 · 228 products across 7 supermarkets

The best-value protein bars in the UK right now is Nature Valley Protein + Fibre Coconut & Almond at Waitrose — £0.02/kg (£3.15).

228Products Compared

7Supermarkets

£0.02Lowest /Kg

We compare protein bars across all 7 major UK supermarkets — Tesco, Sainsbury's, Asda, Morrisons, Waitrose, Aldi and M&S — and rank by price per unit so you can see where protein bars is genuinely cheapest. Prices update daily.

#	Product	Store	Price	Per Unit
1	Nature Valley Protein + Fibre Coconut & Almond	Waitrose	£3.15	£0.02/kg
2	Nature Valley Protein + Fibre Chocolate & Orange	Waitrose	£3.15	£0.02/kg
3	Grenade Protein Bars Oreo Bars 4 x 60g	Asda	£7.80	£1.95/each
4	Fulfil White Chocolate Peanut & Caramel Flavour Vitamin & Protein Bar 55g	Morrisons	£2.90	£2.90/each
5	Optimum Nutrition High Protein Shake Chocolate Flavour 500ml	Asda	£3.70	£7.40/litre
6	GOLDEN BRIDGE Chocolate Protein Peanut Bars 0.16 KG	Aldi	£1.99	£12.44/kg
7	Nature Valley Protein Peanut and Chocolate 8x 40g	Tesco	£4.75	£14.84/kg
8	Nature Valley Protein Salted Caramel Nut Cereal Bars 4 x 40g	Asda	£2.50	£15.63/kg
9	Nature Valley Protein Peanut & Chocolate Cereal Bars 4 x 40g (160g)	Asda	£2.50	£15.63/kg
10	Skinny Brands Protein Peanut Butter Bars 5 x 21g	Asda	£1.72	£16.38/kg
11	TREK Cocoa Oat Protein Flapjacks Multipack	Waitrose	£2.50	£16.67/kg
12	TREK Original Oat Protein Flapjacks Multipack	Waitrose	£2.50	£16.67/kg
13	TREK Protein Flapjacks Lotus Biscoff 3 Bars	Waitrose	£2.50	£16.67/kg
14	TREK Salted Caramel Protein Flapjacks Multipack	Waitrose	£2.50	£16.67/kg
15	TREK Smooth Lemon Protein Flapjacks Multipack	Waitrose	£2.50	£16.67/kg
16	TREK White Choc & Raspberry Protein Flapjacks Multipack	Waitrose	£2.50	£16.67/kg
17	Warrior Raw Cookies & Cream Protein Flap Jack 75g	Asda	£1.25	£16.67/kg
18	Warrior Raw Honey Berry Protein Flap Jack 75g	Asda	£1.25	£16.67/kg
19	Warrior Raw Protein Flapjack Chocolate Peanut Butter 75g	Asda	£1.25	£16.67/kg
20	Warrior Raw Protein Flapjack Red Velvet Cake 75g	Asda	£1.25	£16.67/kg
21	Warrior Raw Protein Flapjack Salted Caramel 75g	Asda	£1.25	£16.67/kg
22	Warrior Raw Protein Flapjack White Chocolate Cranberry 75g	Asda	£1.25	£16.67/kg
23	Nature Valley Protein Big Pack Peanut & Chocolate Cereal Bars 8 x 40g	Morrisons	£5.50	£17.19/kg
24	Skinny Brands Protein Salted Caramel Bars 5 x 20g	Asda	£1.77	£17.70/kg

See The Live Protein Bars Comparison →

Cheapest Protein Bars: FAQ

Where is the cheapest protein bars in the UK?

Right now the best value protein bars is Nature Valley Protein + Fibre Coconut & Almond at Waitrose, £3.15 (£0.02/kg). SmartShelf ranks protein bars by price per unit across 7 supermarkets, updated daily.

Which supermarket is cheapest for protein bars?

We compare protein bars across Tesco, Sainsbury's, Asda, Morrisons, Waitrose, Aldi and M&S. Today Waitrose has the cheapest option, but the ranking updates every day as prices change.

How does SmartShelf compare protein bars 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.