MyProtein Impact Whey is the UK's most-bought protein powder, delivering 72g of protein per 100g with a sale-floor cost of roughly £1.20 per 100g during Impact Week and payday code drops. At that price it is the cheapest mainstream whey concentrate in the UK. At full RRP it is around £55 per 2.5kg bag, which puts it level with Bulk and behind premium picks like Optimum Nutrition Gold Standard.
This post is the hub for "MyProtein compare" — comparing MyProtein's own products against each other, against Bulk Pure Whey, against Optimum Nutrition Gold Standard, and against Applied Nutrition. Every claim is anchored to live data from the WheyWise MyProtein brand page, which tracks every active MyProtein SKU and reprices it weekly.
How does MyProtein compare on price in 2026?
MyProtein wins on sale-price-per-gram-of-protein and loses on full-price-per-gram. The discount-code game decides which one applies to you.
Impact Whey on a code: roughly £1.20 per 100g of powder, which works out to about 36p per 25g of protein. That is among the cheapest cost-per-protein figures of any UK whey.
Impact Whey at full RRP: roughly £2.20 per 100g, which puts it level with Bulk Pure Whey at full price and 25 percent cheaper than Optimum Nutrition Gold Standard.
Impact Whey Isolate on a code: roughly £1.60 per 100g, working out to about 47p per 25g of protein. Cheaper than every other UK whey isolate on a like-for-like discount.
The decisive factor is how comfortable you are timing purchases around sale cycles. If you can wait for Impact Week (roughly once every six to eight weeks) and apply a 40 to 50 percent code, MyProtein is unbeatable on price per gram of protein. If you prefer transparent pricing without code-hunting, Bulk Pure Whey is the better fit. The full MyProtein vs Bulk breakdown covers the trade-off on real prices.
MyProtein Impact Whey Protein Powder
810g bag
MyProtein Impact Whey is the UK's most-bought whey concentrate. The right pick if you'll wait for Impact Week and buy the 2.5kg or 5kg bag at 40-50% off — that's when the price-per-25g-of-protein lands among the cheapest in the country.
See cheapest price →Buy direct from MyProtein →MyProtein Impact Whey Protein Powder
810g bag
MyProtein Impact Whey is the UK's most-bought whey concentrate. The right pick if you'll wait for Impact Week and buy the 2.5kg or 5kg bag at 40-50% off — that's when the price-per-25g-of-protein lands among the cheapest in the country.
See cheapest price →Buy direct from MyProtein →Quick verdict
Pros
- + 72g protein per 100g, the budget whey concentrate benchmark
- + Sale floor of roughly £1.20 per 100g during Impact Week codes
- + 40+ flavours, the widest range of any UK whey
- + Bag sizes from 250g to 5kg, accommodates any buyer
Cons
- – Full RRP is poor value compared to Bulk and Warrior
- – Frequent flavour reformulations affect taste consistency review-to-review
Quick verdict
Pros
- + 72g protein per 100g, the budget whey concentrate benchmark
- + Sale floor of roughly £1.20 per 100g during Impact Week codes
- + 40+ flavours, the widest range of any UK whey
- + Bag sizes from 250g to 5kg, accommodates any buyer
Cons
- – Full RRP is poor value compared to Bulk and Warrior
- – Frequent flavour reformulations affect taste consistency review-to-review
MyProtein vs the closest UK rivals
The four brands that compete with MyProtein on price in the UK whey market in 2026 are Bulk, Optimum Nutrition, Applied Nutrition, and Warrior. Each takes a different approach.
MyProtein vs Bulk: Bulk Pure Whey delivers 71g protein per 100g with transparent pricing that rarely fluctuates — roughly £1.68 per 100g at sale floor. MyProtein on a code wins by about 30 percent per 25g of protein. Bulk wins on consistency and 5kg bag pricing. See the dedicated MyProtein vs Bulk review.
MyProtein vs Optimum Nutrition Gold Standard: Gold Standard delivers 79g protein per 100g from a whey blend, at roughly £2.42 per 100g on sale. MyProtein Impact Whey on a code is half the price for similar protein content. Gold Standard wins on taste consistency (Double Rich Chocolate is the industry benchmark) and Informed Sport certification. The side-by-side comparison breaks down the trade.
MyProtein vs Applied Nutrition: Applied Nutrition Critical Whey delivers 72g protein per 100g via Amazon UK with Prime delivery, at roughly £1.85 per 100g consistently. MyProtein on a code beats it on price; Applied Nutrition wins on convenience and Informed Sport testing.
MyProtein vs Warrior: Warrior Whey delivers 71g protein per 100g with a sale floor near £1.70 per 100g — the lowest non-code price in the UK. MyProtein on Impact Week still undercuts Warrior; off-code, Warrior wins. The MyProtein vs Warrior review covers it.
For the full live comparison across every UK retailer, sorted by cost per 25g of protein, the whey concentrate comparison table updates weekly across 85+ retailers.
MyProtein products compared: Impact Whey, Isolate, Clear Whey
MyProtein sells five major protein products in the UK. Comparing them against each other is what "myprotein compare" usually means in practice.
Impact Whey (whey concentrate): 72g protein per 100g. The default budget choice. Best for daily training, mass-phase use, and anyone who tolerates lactose well.
Impact Whey Isolate: 76g protein per 100g, lower lactose and fat. Roughly 35 to 50 percent more expensive than Impact Whey per gram of protein. Best for cutting macros, lactose-sensitive guts, or anyone wanting cleaner ingredient profile.
Clear Whey Isolate: 20g of protein per scoop in a juice-style clear drink rather than a milky shake. Best for users who hate the texture of traditional whey. Priced at a premium over Impact Whey Isolate.
The Whey+: 87g protein per 100g via a triple-source whey blend (isolate, hydrolysate, concentrate). MyProtein's premium tier. Best for users who want the closest equivalent to Optimum Nutrition Gold Standard from MyProtein's catalogue.
Pro Whey: Hydrolysed-whey-led blend at the very top of MyProtein's range. Highest protein density but priced near £3 per 100g — rarely the right value pick.
MyProtein Impact Whey Isolate Powder
1kg bag
MyProtein Impact Whey Isolate is the cleanest-macros option in MyProtein's catalogue without paying The Whey+ premium prices. Best on a 40-50% Impact Week code — at RRP, Bulk Pure Whey Isolate at 84g per 100g is a better deal.
See cheapest price →Buy direct from MyProtein →MyProtein Impact Whey Isolate Powder
1kg bag
MyProtein Impact Whey Isolate is the cleanest-macros option in MyProtein's catalogue without paying The Whey+ premium prices. Best on a 40-50% Impact Week code — at RRP, Bulk Pure Whey Isolate at 84g per 100g is a better deal.
See cheapest price →Buy direct from MyProtein →Quick verdict
Pros
- + 76g protein per 100g, the cleanest macros in MyProtein's mainstream range
- + Lower lactose than Impact Whey for sensitive guts
- + Sale-floor near £1.60 per 100g on Impact Week codes
- + Available in clear isolate and traditional milky variants
Cons
- – RRP is roughly 40% higher than Impact Whey for 4g more protein per 100g
- – Only worth buying on a code drop — full price is overpriced
Quick verdict
Pros
- + 76g protein per 100g, the cleanest macros in MyProtein's mainstream range
- + Lower lactose than Impact Whey for sensitive guts
- + Sale-floor near £1.60 per 100g on Impact Week codes
- + Available in clear isolate and traditional milky variants
Cons
- – RRP is roughly 40% higher than Impact Whey for 4g more protein per 100g
- – Only worth buying on a code drop — full price is overpriced
For a focused head-to-head on the two MyProtein products people compare most often, see the Impact Whey vs Impact Whey Isolate review.
Where to buy MyProtein cheapest in the UK
MyProtein sells direct via myprotein.com and also stocks select lines on Amazon UK and at Holland and Barrett. The price varies meaningfully between channels.
Direct from myprotein.com on a code: always the cheapest channel for the headline products (Impact Whey, Isolate, Clear Whey). Stack a 40 to 50 percent Impact Week code with a payday promo and you land at the lowest cost per gram of protein in the UK market.
Amazon UK: select MyProtein lines including Impact Whey and The Whey+ are on Prime. The Prime price is usually 10 to 25 percent higher than the direct site on a code, but Subscribe and Save knocks 5 to 15 percent off and the next-day delivery is included. For occasional buyers who do not want to time purchases, this is the cleanest option.
Holland and Barrett: stocks Impact Whey and Clear Whey in physical stores. Always 20 to 40 percent more expensive than direct. Useful only for emergency restocks.
The live MyProtein brand page shows every active SKU sorted by cost per 25g of protein across all tracked retailers, updated weekly.
MyProtein discount codes: how to stack savings
MyProtein's pricing is built around a code-stacking model that catches new buyers off-guard. The list price almost never applies. Here is the actual price structure.
Standard code (always-on): a 35 to 40 percent off code is essentially permanent on the site banner. Treat this as the baseline price, not the RRP.
Impact Week (every 6-8 weeks): sitewide events with 50 to 60 percent off most products. The lowest-price-per-gram-of-protein windows of the year. Set a reminder.
Payday Friday: end-of-month promos that overlap with Impact Week roughly half the time, otherwise add a 5 to 10 percent stacking discount.
Affiliate and influencer codes: typically 5 to 10 percent extra on top of any sitewide code. Many UK fitness creators have evergreen codes. The WheyWise deals page surfaces the verified codes that actually work week-to-week.
The most expensive way to buy MyProtein is at full RRP without a code. The cheapest way is to wait for Impact Week, apply the sitewide code plus an affiliate stacking code, buy the 2.5kg or 5kg bag, and lock in the lowest cost-per-protein figure for two to three months.
When MyProtein is not the right pick
MyProtein dominates on price-with-codes but is not the right answer for every buyer. Three scenarios where another brand wins.
You compete in a drug-tested federation. MyProtein offers Informed Sport certification only on selected lines. Applied Nutrition Critical Whey and Optimum Nutrition Gold Standard test every batch. If you are subject to banned-substance screening, MyProtein on the non-certified lines is a risk that price savings do not justify.
Pricing transparency matters more than the absolute floor. Bulk Pure Whey has consistent pricing without code games. The price you see is the price you pay. For users who hate timing purchases around sales cycles, Bulk is the cleaner buy.
You want the absolute lowest off-code price. Warrior Whey's sale floor is near £1.70 per 100g without needing a discount code. MyProtein on Impact Week beats this, but only during the discount window. Outside Impact Week, Warrior is consistently cheaper.
For the full list of MyProtein alternatives across price, flavour, and protein density, see the MyProtein alternatives UK guide.
Frequently asked questions
Is MyProtein actually cheap in 2026? Yes, when you buy on an Impact Week or sitewide discount code. MyProtein Impact Whey lands at roughly 36p per 25g of protein on a 40 to 50 percent off code, which is the cheapest mainstream whey concentrate price in the UK. At full RRP, MyProtein is mid-range — Bulk Pure Whey and Warrior Whey both undercut it without needing a code.
What is the difference between MyProtein Impact Whey and Impact Whey Isolate? Impact Whey is a whey concentrate at 72g protein per 100g. Impact Whey Isolate is a more processed whey isolate at 76g protein per 100g, with lower lactose and fat. The isolate costs roughly 35 to 50 percent more per gram of protein, so it is worth the upgrade only for lactose-sensitive users or cutting macros where every calorie matters. The Impact Whey vs Impact Whey Isolate review breaks it down.
Where is MyProtein the cheapest to buy in the UK? Direct from myprotein.com during Impact Week with a sitewide discount code is consistently the lowest price. Amazon UK Subscribe and Save is the second-cheapest channel and is more convenient. Holland and Barrett is always the most expensive — avoid unless you need to restock the same day.
Why does MyProtein use so many discount codes? MyProtein operates a permanent-discount model where the "RRP" almost never applies. The site banner shows a 35 to 40 percent off code as the baseline, and Impact Week pushes it to 50 to 60 percent off. The model maximises perceived savings while letting MyProtein keep the apparent list price high — useful for marketing claims like "75 percent off". The why MyProtein is so expensive analysis covers the deeper economics.
Is MyProtein owned by THG? Yes. MyProtein is the largest brand in The Hut Group (THG) portfolio, alongside Pulseroll, Myvitamins, and PROtein Works (separate brand). The THG ownership explains the aggressive code-driven pricing model and the wide flavour range, both driven by direct-to-consumer scale.
