Various · 4.54kg
19.8g
93
1.3g
1g
£0.84per 25g protein
£119.99 bag·1 retailer·
Optimum Nutrition
Optimum Nutrition Whey Protein: Compare UK Prices
Every Optimum Nutrition protein product tracked, ranked by cost per 25g protein. UK pricing across stocking retailers, each price shown with its check date.
22 products tracked57+ retailersDated price checks
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Is Optimum Nutrition a good brand?
Optimum Nutrition is the right choice when certified-clean whey protein matters more than rock-bottom price. Gold Standard 100% Whey is Informed Choice certified, with England Rugby and Elite Series variants additionally Informed Sport registered, useful if you compete in tested sport. The range goes well beyond the flagship whey: Gold Standard Whey Isolate, Gold Standard Plant for vegans, Gold Standard Casein for a slow overnight protein, and Serious Mass for bulking. On Gold Standard Whey the larger 4.54kg tub almost always works out cheaper per 25g of protein than the 2.27kg, so sizing up is the simplest saving. WheyWise tracks 22 Optimum Nutrition products across 6 categories. The cheapest right now is £0.84 per 25g of protein on Gold Standard 100% Whey Protein 4.54kg, ranging up to £3.12 across 4 UK retailers. Third-party retailers like Amazon and Holland and Barrett regularly undercut Optimum Nutrition's own site, so sort the table below to find the cheapest for the exact product and size you want.
CHEAPEST
Whey concentrate4.54kg
Various · 899g
19g
94
1.3g
1.2g
£1.02per 25g protein
£27.99 bag·1 retailer·
Whey concentrate899g
Vegan Protein Shake Powder · 684g
18.3g
100
1.7g
1.9g
£1.06per 25g protein
£21.25 bag·1 retailer·
CHEAPEST
Vegan684g
Post · 684g
18.3g
100
1.7g
1.9g
£1.06per 25g protein
£21.25 bag·1 retailer·
Vegan684g
Various · 2.27kg
19g
94
1.3g
1.2g
£1.12per 25g protein
£76.99 bag·1 retailer·
Whey concentrate2.27kg
Strawberry · 1.8kg
18.5g
88
1.5g
0.6g
£1.26per 25g protein
£66.95 bag·1 retailer·
CHEAPEST
Casein1.8kg
Various · 2.27kg
19.3g
94
1.1g
1.2g
£1.28per 25g protein
£89.84 bag·1 retailer·
Whey concentrate2.27kg
Various · 2.2kg
19.8g
93
1.3g
1g
£1.29per 25g protein
£89.84 bag·1 retailer·
Whey concentrate2.2kg
Chocolate Flavour · 684g
19.8g
93
1.3g
1g
£1.30per 25g protein
£28.00 bag·1 retailer·
HIGHEST PROTEIN %
Vegan684g
French Vanilla Creme · 684g
18.3g
100
1.7g
1.9g
£1.40per 25g protein
£28.00 bag·1 retailer·
Vegan684g
Various · 920g
20g
94
1g
0.5g
£1.41per 25g protein
£41.37 bag·1 retailer·
HIGHEST PROTEIN %
Casein920g
Hydro · 1.6kg
18.8g
88
0.7g
0.3g
£1.43per 25g protein
£68.50 bag·1 retailer·
Whey concentrate1.6kg
Supplement Doses · 930g
20.8g
91
1.1g
0.4g
£1.46per 25g protein
£44.99 bag·1 retailer·
CHEAPEST
Whey isolate930g
Vanilla Bean Flavour · 1.6kg
18.8g
88
0.7g
0.3g
£1.62per 25g protein
£77.84 bag·1 retailer·
Whey concentrate1.6kg
Glutamine and BCAA · 1.6kg
18.8g
88
0.7g
0.3g
£1.68per 25g protein
£80.75 bag·1 retailer·
Whey isolate1.6kg
Serious Chocolate · 5.4431kg
3.8g
94
18.8g
0.5g
£1.75per 25g protein
£56.99 bag·1 retailer·
BULK GAINS
Mass gainer5.4431kg
Chocolate · 924g
18.5g
88
1.5g
0.6g
£1.83per 25g protein
£50.00 bag·1 retailer·
Casein924g
Lime Sorbet · 280g
17.5g
80
0.6g
0.2g
£2.42per 25g protein
£18.98 bag·1 retailer·
CHEAPEST
Clear whey280g
Serious · 2.73kg
3.8g
94
18.8g
0.5g
£2.44per 25g protein
£40.00 bag·1 retailer·
Mass gainer2.73kg
Vanilla · 5.45kg
3.8g
94
18.8g
0.5g
£2.51per 25g protein
£82.00 bag·1 retailer·
Mass gainer5.45kg
Blackcurrant · 480g
17.5g
80
0.7g
0.2g
£2.53per 25g protein
£33.99 bag·1 retailer·
Clear whey480g
Sugarfree · 280g
17.9g
23
0.7g
0.4g
£3.12per 25g protein
£25.00 bag·1 retailer·
HIGHEST PROTEIN %
Clear whey280g
Browse All Optimum Nutrition Products (22)
About Optimum Nutrition
UK prices on every Optimum Nutrition product we track, ranked by cost per 25g of protein. Every price is shown with the date it was checked.
Frequently Asked Questions
How much does Optimum Nutrition Gold Standard Whey cost in the UK?
Optimum Nutrition whey protein currently ranges from £0.84 to £3.12 per 25g of protein across the UK retailers we track. The cheapest product right now is Gold Standard 100% Whey Protein 4.54kg. Expect to pay 30 to 50 percent more than UK value brands for the Gold Standard name.
Which size is cheapest, Gold Standard Whey 2.27kg or 4.54kg?
The 4.54kg tub almost always works out cheaper per 25g of protein than the 2.27kg, because the price per kilo drops on the larger size. The table above ranks every Optimum Nutrition size by cost per 25g, so you can confirm the cheapest tub before you buy.
Is there an Optimum Nutrition whey isolate or vegan protein?
Yes. Optimum Nutrition makes Gold Standard 100% Isolate for a leaner, lower-carb whey, and Gold Standard Plant as a vegan option. Both appear in the comparison above alongside the standard whey, casein and Serious Mass, ranked by cost per 25g of protein.
How many servings are in a tub of Optimum Nutrition whey?
It depends on the size. Gold Standard 100% Whey is sold in tubs around 2.27kg (roughly 71 servings) and 4.54kg (roughly 146 servings) of about 30g each. Check the specific product in the table above for its exact serving count and cost per 25g of protein.
Where is Optimum Nutrition cheapest in the UK?
Third-party retailers such as Amazon, Bodybuilding Warehouse and Holland and Barrett regularly undercut Optimum Nutrition's own site on Gold Standard and other core products. The table above shows UK prices across every retailer we track, each with the date it was checked, so you can pick the cheapest for the product and size you want.
Is Gold Standard Whey Informed Sport certified?
Standard Gold Standard 100% Whey is Informed Choice certified. Specific variants including Gold Standard 100% Whey England Rugby and Gold Standard Whey Elite Series are additionally Informed Sport registered. Check the product listing for current certification status.
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Methodology
How we rank every bag.
Independent and transparent, with every price shown alongside the date it was checked. Here's what goes into each score.
01
Cost normalised to £/25g
Every bag divided by its true protein weight, so you see the real cost of a scoop across any size or brand.
02
Protein density, measured
Protein per 100g from the product's own nutrition panel, so a 90% isolate and a 72% concentrate are never compared on bag price alone.
03
Every price carries its date
Prices come from the retailer's own listing, never an RRP, and each one is shown with the day it was last checked so you can judge how current it is.
04
No sponsored placements
Rank order is cost per 25g of protein. Some outbound links earn commission; none of them buy a position in the table.
22 results