Gold Standard 100% Isolate Whey Protein powder 450 g (15 servings) Chocolate
£38.00 for 450 g at Optimum Nutrition. That works out at £2.53 per 25 g protein, which ranks it 100th of the 123 whey protein isolate products we price across 6 UK retailers.
At one 25 g dose a day, this pack lasts 15 days. A month is 30 days, so twelve of them is not quite a year.
How we worked it out
- Servings: 450 ÷ 30 per serving = 15
- In the pack: 15 × 25 g = 375 g
- £38.00 ÷ 375 g × 25 g = £2.53 per 25 g protein
- A week £2.53 × 7 = £17.73 · a month × 30 = £76.00 · a year × 365 = £924.67
- 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 Healf pack saves £5.30 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
- 25 g per serving (stated on the label)
- Pack
- 450 g · 15 servings · 30 g a serving
- Cost per serving
- £2.53 (15 servings in the pack)
More label details
- Sold by
- Optimum Nutrition
- What the listing says
- “Chocolate” · “450 g” · “(15 servings)” · “(30 g)” · “Protein ; 83 g ; 25 g”
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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: 30 g.
What you paid
Optional. At Optimum Nutrition today: £38.00.
“Order by” allows 2 working days’ delivery from Optimum Nutrition and your spare days.
Price history
No price change since 23 September 2026. Checked on 2 days, most recently 9 October 2026.
- Price at every check
- £38.00Optimum Nutrition
- First recorded
- £38.0023 Sept
- Checked on
- 2 dayssince 23 Sept
- First checked at Optimum Nutrition: £38.00
Questions about this product
How much does Optimum Nutrition Gold Standard 100% Isolate Whey Protein powder 450 g (15 servings) Chocolate cost per 25 g protein?
£2.53 per 25 g protein, from £38.00 for 450 g at Optimum Nutrition, checked on 9 October 2026.
Is it the cheapest whey protein isolate in the UK?
No, it is 100th of 123. Impact Whey Isolate Powder at Myprotein works out at 83p per 25 g protein.
How long does one pack last?
15 days at one 25 g dose. The pack holds 375 g in total.
About Optimum Nutrition
Founded 1986 · Downers Grove, Illinois, United States · Part of Glanbia
Optimum Nutrition is a US sports nutrition brand founded in 1986 and headquartered in Downers Grove, Illinois. It has been owned since 2008 by Glanbia plc, an Irish nutrition group. It sells protein powders, including Gold Standard 100% Whey, as well as clear protein, creatine, pre-workout, electrolytes, collagen and vitamins.
All 49 Optimum Nutrition products, priced per doseVisit Optimum Nutrition (opens in a new tab)
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