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Sports & performance

Diet Whey Protein, Vanilla, 500 g

£15.99 for 500 g at Bulk. That works out at £1.18 per 25 g protein, which ranks it 54th of the 160 whey protein concentrate products we price across 8 UK retailers.

What it really costs, per 25 g protein£1.18One 25 g dose is our comparison unit for protein powder. It is not a recommendation.

A day£1.18

A week£8.23

A month£35.27

A year£429.14

At one 25 g dose a day, this pack lasts 14 days. A month is 30 days, so twelve of them is not quite a year.

How we worked it out

Servings: 500 ÷ 25 per serving = 20
In the pack: 20 × 17 g = 340 g
£15.99 ÷ 340 g × 25 g = £1.18 per 25 g protein
A week £1.18 × 7 = £8.23 · a month × 30 = £35.27 · a year × 365 = £429.14
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 concentrate

All 160, ranked →

Impact Whey Protein PowderMyprotein · 22 g a serving · £34.66 a month · a pack lasts 3 months£1.16£91.49View at Myprotein

Essential Whey ProteinMyprotein · 17 g a serving · £35.26 a month · a pack lasts 10 days£1.18£11.99View at Myprotein

This productBulk · 17 g a serving · £35.27 a month · a pack lasts 14 days£1.18shown above

Switching to the Myprotein pack saves 62p a month at the same 25 g dose.

Ranked purely by price per 25 g protein. 54 combination products also contain protein powder.

On the label

Protein powder · Whey concentrate: 17 g per serving (stated on the label)
Pack: 500 g · 20 servings · 25 g a serving
Cost per serving: 80p (20 servings in the pack)

More label details

Sold by: Bulk
What the listing says: “Vanilla” · “Diet Whey Protein - 500g” · “per serving (25g)” · “Protein ; 69g ; 17g” · “Diet Whey Protein”

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Daily dosegFordays

One 25 g dose is our comparison unit, not a recommendation.

Price history

1 price change since 23 September 2026. Checked on 21 days, most recently 20 October 2026.

Lowest recorded: £15.995 Oct
Highest recorded: £19.9923 Sept
First recorded: £19.9923 Sept
Checked on: 21 dayssince 23 Sept

Pack price at each check.

5 Oct Down at Bulk: £19.99 → £15.99 (−20%)
23 SeptFirst checked at Bulk: £19.99

Questions about this product

How much does Bulk Diet Whey Protein cost per 25 g protein?

£1.18 per 25 g protein, from £15.99 for 500 g at Bulk, checked on 20 October 2026.

Is it the cheapest whey protein concentrate in the UK?

No, it is 54th of 160. 100% Protein at Protein Works works out at 59p per 25 g protein.

How long does one pack last?

14 days at one 25 g dose. The pack holds 340 g in total.

About Bulk

Founded 2006 · Colchester, England

Bulk is a British sports nutrition company based in Colchester, Essex. Adam Rossiter and Elliot Dawes, who met at the University of Essex, started it in 2006 as Bulk Powders; it was renamed Bulk at the start of 2021, and the founders remain its majority owners.

All 133 Bulk products, priced per dose Visit Bulk (opens in a new tab)

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