CHEAPEST
Choose size
19g
97
0.7g
1.8g
ON vs Myprotein
Optimum Nutrition vs Myprotein: Price Comparison 2026
Optimum Nutrition vs Myprotein head-to-head across every product, ranked by cost per 25g protein. UK pricing across both brands, every price read from the retailer’s own page and re-checked daily.
31 products trackedChecked daily
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CHEAPEST
Choose size
16.3g
107
0.9g
4g
Choose size
17.5g
90
1.5g
1.3g
Choose size
18g
96
2.2g
1.5g
Choose size
16.3g
93
2.4g
1.6g
CHEAPEST
Choose size
19.8g
89
0.8g
0.3g
CHEAPEST
20.5g
89
1g
0.5g
Size
1kg
17.5g
90
0.8g
0.8g
Size
1kg
18.5g
96
1.8g
1.5g
HIGHEST PROTEIN %
19.5g
100
2g
1.4g
Size
1kg
19g
97
0.7g
1.8g
Size
899g
19g
94
1.3g
1.2g
Size
1kg
17.5g
90
0.8g
0.8g
BULK GAINS
Choose size
7.3g
98
14.3g
1.3g
Choose size
19g
94
1.3g
1.2g
Size
2.5kg
6.8g
91
11.8g
1.6g
Size
684g
18.3g
100
1.7g
1.9g
Size
1kg
19.8g
91
1.3g
0.5g
CHEAPEST
Choose size
19.5g
85
1.6g
0g
Choose size
18g
95
2.8g
1.1g
HIGHEST PROTEIN %
Choose size
21.3g
89
0.9g
0g
Choose size
18.5g
88
1.5g
0.6g
HIGHEST PROTEIN %
Choose size
20.8g
91
1.1g
0.4g
Size
2.74kg
5.5g
93
15g
1g
Browse All ON & Myprotein Products (31)
Optimum Nutrition vs Myprotein: The Breakdown
Optimum Nutrition and Myprotein are two of the most popular protein brands in the UK, but they target different ends of the market. Optimum Nutrition (ON) is best known for Gold Standard Whey - a gym staple sold across dozens of third-party retailers. Myprotein sells direct and relies on frequent sales and discount codes to undercut on price.
This page compares every product from both brands side by side using UK pricing, normalised to cost per 25g of protein. Because ON products are stocked by many retailers, you will often see the same product at different prices - the grid shows the cheapest available option for each.
Every price is read from the retailer’s own page and re-checked daily. Myprotein tends to be cheaper on paper, but ON's pricing is more stable and you rarely need a discount code. Use the grid below to see which brand offers better value right now.
Shop by goal
Pick a target, see the shortlist.
Brand battles
Two brands, one clear winner.
MyproteinBulk
The UK's two biggest DTC brands, head-to-head
ONMyprotein
Premium global vs budget UK favourite
MyproteinProtein Works
Impact Whey vs Whey 80, cheapest per 25g
Power users
Advanced comparison: every product, filteredDense table view with every product, full filter sidebar, and no editorial surfaces.
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.
Questions, answered.
Optimum Nutrition Gold Standard Whey consistently tests close to its label claims and uses whey isolate as the primary ingredient. Myprotein Impact Whey is a concentrate-first blend that delivers solid protein content at a lower price point. Both are reputable - ON is generally considered the premium option, while Myprotein wins on value.
ON uses whey isolate as the first ingredient in Gold Standard, sources from established US manufacturing, and sells through third-party retailers who each add margin. Myprotein manufactures and sells direct, cutting out the middleman. The price gap reflects distribution model as much as ingredient quality.
Prices vary significantly across retailers. Use the comparison grid above to find the cheapest price - we track ON products across 181+ UK brands and re-check every price daily.