CHEAPEST
Size
899g
19g
94
1.3g
1.2g
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, every price read from the retailer’s own page and re-checked daily.
10 products trackedChecked daily
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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 10 Optimum Nutrition products across 7 categories. The cheapest right now is £1.02 per 25g of protein on Whey Protein Powder 100% Concentrate 899g, ranging up to £3.19 across 1 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
Size
684g
18.3g
100
1.7g
1.9g
Choose size
19g
94
1.3g
1.2g
CHEAPEST
Choose size
18.5g
88
1.5g
0.6g
CHEAPEST
Choose size
20.8g
91
1.1g
0.4g
Size
684g
18.3g
100
1.7g
1.9g
Size
1.6kg
18.8g
88
0.7g
0.3g
CHEAPEST
Choose size
20.5g
86
0.6g
0.1g
BULK GAINS
Choose size
3.8g
94
18.8g
0.5g
Size
280g
17.5g
80
0.7g
0.2g
Browse All Optimum Nutrition Products (10)
About Optimum Nutrition
UK prices on every Optimum Nutrition product we track, ranked by cost per 25g of protein. Every price is read from the retailer’s own page and re-checked daily.
Also made by Optimum Nutrition
These 12 products are part of the Optimum Nutrition range but have no live price from a retailer we track, so they are not in the comparison above. You can still check them on Amazon.
- No imageClear Whey + Collagen
85g protein per 100g
No live priceSearch on Amazon - Eaa Energy
No live priceSearch on Amazon - Gold Standard 100% Plant Based Protein Powder
73g protein per 100g
No live priceSearch on Amazon - Gold Standard Advanced Pre Workout
No live priceSearch on Amazon - Gold Standard BCAA
77g protein per 100g
No live priceSearch on Amazon - Gold Standard Bcaa Train + Sustain
77g protein per 100g
No live priceSearch on Amazon - Gold Standard BCAA Train + Sustain Powder
77g protein per 100g
No live priceSearch on Amazon - No imageGold Standard Pre Workout AdvancedNo live priceSearch on Amazon
- Platinum Creatine
No live priceSearch on Amazon - Platinum Pre-Workout
No live priceSearch on Amazon - Platinum Pump Pre-Workout Caffeine-Free Powder
No live priceSearch on Amazon - Serious Mass Weight Gainer Protein Powder
15g protein per 100g
No live priceSearch on Amazon
Frequently Asked Questions
How much does Optimum Nutrition Gold Standard Whey cost in the UK?
Optimum Nutrition whey protein currently ranges from £1.02 to £3.19 per 25g of protein across the UK retailers we track. The cheapest product right now is Whey Protein Powder 100% Concentrate 899g. 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 re-checked daily, 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. Every price is read from the retailer's own page and checked daily. 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
Real prices, checked daily
Prices come from the retailer's own listing, never an RRP, and we re-check them every day rather than leaving a feed to drift.
04
Rankings can't be bought
Rank order is cost per 25g of protein. Some outbound links earn commission, and some Amazon links marked Ad pay per click; none of them buy a position in the table.