73 bought·Salted Caramel (best before date 11/25) · 2.2kg
19.8g
93
1.3g
68
£0.50per 25g protein
£34.99 bag·1 retailer
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. Live UK pricing, updated weekly across both brands.
147 products tracked98+ retailersWeekly updates
Showing 147 on vs myprotein products
Quick filters
CHEAPEST● Trending
Whey concentrate2.2kg
73 bought this week
66 bought·Cereal Milk · 5kg
18g
98
1.7g
87
£0.52per 25g protein
£75.49 bag·1 retailer
CHEAPEST
Vegan5kg
66 bought this week
84 bought·100servings Vanilla · 2.5kg
16.3g
107
0.9g
68
£0.62per 25g protein
£39.99 bag·1 retailer
TRENDING
Whey concentrate2.5kg
84 bought this week
99 bought·70servings Chocolate Fudge · 2.5kg
18g
95
2.2g
72
£0.62per 25g protein
£44.99 bag·1 retailer
TRENDING
Whey concentrate2.5kg
99 bought this week
91 bought·Chocolate Mint Short Dated 02/26 · 5.4kg
3.8g
94
18.8g
47
£0.62per 25g protein
£19.99 bag·1 retailer
BULK GAINS
Mass gainer5.4kg
91 bought this week
82 bought·Vanilla · 684g
18.3g
100
1.7g
87
£0.75per 25g protein
£14.95 bag·1 retailer
TRENDING
Vegan684g
82 bought this week
166servings Mocha · 5kg
18g
96
2.2g
73
£0.75per 25g protein
£108.49 bag·1 retailer
● Trending
Whey concentrate5kg
75 bought·Various · 1kg
20.5g
89
0.8g
76
£0.75per 25g protein
£24.49 bag·1 retailer
CHEAPEST
Casein1kg
75 bought this week
87 bought·Chocolate Coconut · 5kg
14.8g
89
3g
69
£0.76per 25g protein
£89.99 bag·1 retailer
TRENDING
Whey concentrate5kg
87 bought this week
Various · 4.54kg
19.8g
93
1.3g
73
£0.84per 25g protein
£119.99 bag·1 retailer
Whey concentrate4.54kg
Supplement · 4.54kg
19.8g
95
1.4g
71
£0.84per 25g protein
£119.99 bag·1 retailer
● Trending
Whey concentrate4.54kg
84 bought·Natural Chocolate · 1kg
18.5g
96
1.8g
71
£0.84per 25g protein
£24.99 bag·1 retailer
TRENDING
Whey concentrate1kg
84 bought this week
77 bought·Extreme Milk Chocolate · 908g
19.8g
93
1.3g
51
£0.87per 25g protein
£24.95 bag·1 retailer
HIGHEST PROTEIN %
Mass gainer908g
77 bought this week
83 bought·VANILLA ICE CREAM · 4.54kg
19.8g
93
1.3g
70
£0.89per 25g protein
£127.79 bag·1 retailer
TRENDING
Whey concentrate4.54kg
83 bought this week
Vanilla · 4.5kg
19.8g
93
1.3g
69
£0.91per 25g protein
£129.99 bag·1 retailer
● Trending
Whey concentrate4.5kg
Milk Chocolate · 2.1kg
18g
95
2.8g
68
£0.91per 25g protein
£54.99 bag·1 retailer
Whey concentrate2.1kg
Natural Chocolate (Informed Sport) · 1kg
18.5g
95
1.8g
67
£0.91per 25g protein
£26.99 bag·1 retailer
Whey concentrate1kg
88 bought·Apple · 1kg
16.3g
96
3g
69
£0.92per 25g protein
£23.99 bag·1 retailer
TRENDING
Whey concentrate1kg
88 bought this week
96 bought·Delicious Strawberry · 4.54kg
19.8g
93
1.3g
67
£0.94per 25g protein
£134.99 bag·1 retailer
TRENDING
Whey concentrate4.54kg
96 bought this week
Unflavoured · 2.5kg
19.5g
100
2g
68
£0.96per 25g protein
£74.99 bag·1 retailer
Whey concentrate2.5kg
Banana Cream · 2.28kg
19.8g
93
1.3g
72
£0.97per 25g protein
£70.00 bag·1 retailer
● Trending
Whey concentrate2.28kg
Strawberry · 2.28kg
19.8g
93
1.3g
68
£0.97per 25g protein
£70.00 bag·1 retailer
Whey concentrate2.28kg
Strawberry · 4.5kg
19.8g
93
1.3g
68
£0.97per 25g protein
£137.99 bag·1 retailer
Whey concentrate4.5kg
French Vanilla Crme · 2.28kg
19.8g
93
1.3g
71
£0.97per 25g protein
£70.00 bag·1 retailer
● Trending
Whey concentrate2.28kg
Browse All ON & Myprotein Products (147)
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 live 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.
Prices are checked weekly. 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.
Myprotein vs Bulk
The UK's two biggest DTC brands, head-to-head
ON vs Myprotein
Premium global vs budget UK favourite
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, transparent, and updated weekly. 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 quality, not just %
Protein %, leucine and digestibility feed the Performance score. A 90% isolate and a 90% vegan blend are not the same.
03
Clean-label audit
Ingredient count, artificial sweeteners, added sugars, third-party certifications. 0 to 100 score.
04
Social and review signals
Weekly purchase volume and weighted review scores surface what people actually re-buy, not just what ranks on search.
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.
147 results