Diet Whey Protein Isolate 1kg Banana Smooth
£65.99 for 1 kg at Protein Works. That works out at £1.87 per 25 g protein, which ranks it 57th of the 123 whey protein isolate products we price across 6 UK retailers.
At one 25 g dose a day, this pack lasts 35 days. A month is 30 days, so twelve of them is not quite a year.
How we worked it out
- Servings: 1000 ÷ 25 per serving = 40
- In the pack: 40 × 22 g = 880 g
- £65.99 ÷ 880 g × 25 g = £1.87 per 25 g protein
- A week £1.87 × 7 = £13.12 · a month × 30 = £56.24 · a year × 365 = £684.27
- Amount per serving: stated on the label.
The standard dose is a comparison unit, not a recommendation. Always confirm the price on the retailer's site. How we compare everything.
Cheaper whey protein isolate
All 123, ranked →
Switching to the Myprotein pack saves 57p a month at the same 25 g dose.
Ranked purely by price per 25 g protein. 53 combination products also contain protein powder.
On the label
- Protein powder · Whey isolate
- 22 g per serving (stated on the label)
- Pack
- 1 kg · 40 servings · 25 g a serving
- Cost per serving
- £1.65 (40 servings in the pack)
More label details
- Barcode
- 5060339300603
- Sold by
- Protein Works
- What the listing says
- “Banana Smooth” · “1kg” · “per 25g serving” · “Protein (g) ; 86 ; 22”
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One 25 g dose is our comparison unit, not a recommendation.
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Filled in from the label’s serving: 25 g.
What you paid
Optional. At Protein Works today: £65.99.
“Order by” allows 5 working days’ delivery from Protein Works and your spare days.
Price history
1 price change since 23 September 2026. Checked on 2 days, most recently 9 October 2026.
- Lowest recorded
- £64.4923 Sept
- Highest recorded
- £65.999 Oct
- First recorded
- £64.4923 Sept
- Checked on
- 2 dayssince 23 Sept
- Up at Protein Works: £64.49 → £65.99 (+2.3%)
- First checked at Protein Works: £64.49
Questions about this product
How much does Protein Works Diet Whey Protein Isolate 1kg Banana Smooth cost per 25 g protein?
£1.87 per 25 g protein, from £65.99 for 1 kg at Protein Works, checked on 9 October 2026.
Is it the cheapest whey protein isolate in the UK?
No, it is 57th of 123. Impact Whey Isolate Powder at Myprotein works out at 83p per 25 g protein.
How long does one pack last?
35 days at one 25 g dose. The pack holds 880 g in total.
About Protein Works
Founded 2012 · Liverpool, England · Part of Lactalis
Protein Works is a British nutrition company founded in 2012 by Mark Coxhead, Nick Smith and Karl Jacobie. It is based at PW Campus in Speke, Liverpool, which opened in 2025 and replaced several sites in Runcorn.
All 149 Protein Works products, priced per doseVisit Protein Works (opens in a new tab)
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