Best Protein Powder UK 2026
Definitive UK protein powder ranking for 2026 across budget whey concentrate to premium isolate. Real price per 25g of protein on every pick, checked in August.
Kevin, founder of WheyWise
Quick answer
The best protein powder in the UK for most people is now Bulk Basic Whey, the entry-level line most Bulk buyers walk past: 72g protein per 100g at about £1.32 per 100g, or 46p per 25g of protein, roughly a third cheaper per gram than Bulk Pure Whey. NutriSport 90+ is cheaper still at about 39p if you do not mind an unfamiliar name. MyProtein Impact Whey is the pick for flavour range rather than price, at about £1.04 per 25g. Optimum Nutrition Gold Standard remains the premium benchmark at roughly £1.00. Judge on cost per 25g of protein, not sticker price.
The UK protein powder market is enormous - hundreds of products, dozens of retailers, and prices that change weekly. Whether you are looking for a whey protein powder to mix into a quick protein shake after training, or a vegan protein powder with a solid amino acid profile, there is no shortage of choice. This guide cuts through the noise. I've compared the most popular options on price per 100g, protein content, and availability across major UK retailers.
One note before we start: this isn't a taste test or a lab analysis - it's a price and value comparison. For what it's worth, I've tried most of these personally, but your palate is different to mine. What I can tell you objectively is which products give you the most protein per pound, which matters if you are serious about hitting your daily protein intake for muscle building or general health.
Best overall value: Bulk Basic Whey
This is a change from earlier versions of this guide, and it is worth explaining. Basic Whey is Bulk's entry tier, and almost everyone who buys Bulk buys Pure Whey instead. Basic Whey gives you 72g protein per 100g at about £1.32 per 100g, which is 46p per 25g of protein and roughly a third cheaper per gram than Pure Whey at 96p. Same manufacturer, same quality controls, plainer formula and a shorter flavour list.
It is the best answer for most people because it clears the two bars that matter: it is genuinely cheap per gram of protein, and it comes from a brand with a returns policy and a customer service department. Bulk Pure Whey is still the better buy during one of Bulk's several annual sale events, where it adds Informed Sport batch testing for not much more.
Best overall value
Bulk Basic Whey Protein
1.25kg bag
Bulk Basic Whey is the entry tier most Bulk buyers walk past: 72g protein per 100g at around 46p per 25g, roughly a third cheaper per gram than Pure Whey from the same manufacturer. The budget pick if you want a name you recognise.
Buy Basic Whey Protein →Live price at Bulkor compare all UK prices →Best overall value
Bulk Basic Whey Protein
1.25kg bagPros
- + Around 46p per 25g, roughly a third cheaper per gram than Bulk Pure Whey
- + 72g protein per 100g from the same manufacturer and quality controls
- + Big-brand returns policy and customer service
- + 2.5kg bag is the value sweet spot
Cons
- – Shorter flavour list than Pure Whey
- – Plainer formula with no Informed Sport testing on this tier
- – Best prices are on marketplace listings rather than direct
●Nutrition per scoop · 21.6g protein in 30g▼
Protein makes up 72%
of this 30g scoop · 112 kcal total
Best budget pick: NutriSport 90+
If price per gram is the only thing you are optimising for, NutriSport 90+ beats everything here at about £1.18 per 100g, or 39p per 25g of protein in the 5kg bag from a discount stockist. It is a whey isolate and micellar casein blend at 76g protein per 100g, from a British manufacturer that has been going since the 1980s, and it holds 4.45 out of 5 from 846 verified reviews.
The honest trade-off is taste. Reviewers consistently call it acceptable rather than enjoyable, and the brand spends nothing on marketing, which is a large part of why it is cheap. If you will not drink it, it is not a bargain.
Cheapest per gram
NutriSport Nutri Sport 90+ Protein 2.5kg
2.5kg bag
NutriSport 90+ is the cheapest UK whey we would actually recommend: a 76g-per-100g isolate and casein blend at roughly 39p per 25g of protein in the 5kg bag, backed by 846 verified reviews. It spends its budget on protein rather than flavour, so expect a plain shake.
Buy Nutri Sport 90+ Protein 2.5kg →Live price across UK retailersCheapest per gram
Pros
- + 76g protein per 100g, whey isolate and micellar casein blend
- + Cheapest credible cost per gram in the UK, about 39p per 25g in the 5kg
- + 4.45/5 from 846 verified reviews at London Supplements
- + UK manufacturer running since the 1980s, no marketing premium
Cons
- – Taste and texture are plain, reviewers call it acceptable not enjoyable
- – Little brand presence, so fewer flavour options than the big names
- – Best price needs the 5kg bag from a discount stockist
●Nutrition per scoop · 27g protein in 30g▼
Protein makes up 90%
of this 30g scoop · 113 kcal total
Best for flavour: MyProtein Impact Whey
Impact Whey used to lead this guide on price. As of August 2026 it does not: the 4.5kg bag direct works out at about £2.99 per 100g, or £1.04 per 25g of protein, and even a full 50 percent Impact Week code only takes it to roughly £1.49 per 100g. Raw whey went from under $4 a pound in 2023 to about $11, and MyProtein passed it through.
What it still wins on is flavour range, which is unmatched in the UK, and availability. Buy it because you want 40-plus flavours and will actually finish the bag, not because it is cheapest. And never pay the RRP: the listed price is set high so the constant discount looks bigger, so use the per-100g price as your benchmark rather than the percentage off.
Best flavour range
MyProtein Impact Whey Protein 2.5kg Powder
1kg bag
UK's bestselling whey concentrate with 82g protein per 100g. Regularly discounted 40-60% - never pay full price.
Buy Impact Whey Protein 2.5kg Powder →Live price at MyProteinor compare all UK prices →Best flavour range
Pros
- + 82g protein per 100g high purity
- + Cheapest per serving during sales
- + Huge 60+ flavour range
- + 5kg bags for long-term savings
Cons
- – Full price is poor value
- – Needs discount code to compete
- – Reformulations change taste occasionally
●Nutrition per scoop · 21.6g protein in 30g▼
Protein makes up 72%
of this 30g scoop · 113 kcal total
Best isolate: Bulk Pure Whey Isolate
If you are lactose intolerant or want a cleaner macro profile, isolate is worth the premium, though that premium has grown. Bulk Pure Whey Isolate is 84g protein per 100g at roughly £3.80 per 100g of powder. The cheapest isolate we track is Naughty Boy ISO-9 at 90g protein per 100g and about £2.40 per 100g, which works out near 67p per 25g of protein against Bulk's £1.13. Compare all whey isolate prices to find the cheapest right now.
Best isolate
Bulk Natural Pure Whey Isolate
1kg bag
High-purity whey isolate from Bulk with 27g protein per 30g scoop. Very low fat and lactose, ideal for calorie-conscious or lactose-sensitive buyers.
Buy Natural Pure Whey Isolate →Live price at Bulkor compare all UK prices →Best isolate
Pros
- + 27g protein per 30g serving
- + Very low fat and carbs
- + Suitable for lactose-intolerant
- + Mixes thin and smooth easily
Cons
- – Pricier than concentrate version
- – Thinner mouthfeel less satisfying
- – Fewer flavour options
●Nutrition per scoop · 25.2g protein in 30g▼
Protein makes up 84%
of this 30g scoop · 105 kcal total
Best premium option: Optimum Nutrition Gold Standard
ON Gold Standard is the global benchmark for a reason. It is not cheap, at roughly £3.16 per 100g or about £1.00 per 25g of protein, but the consistency and quality are excellent and it is 79g protein per 100g. If you buy via Holland & Barrett during a 3-for-2 or buy-one-get-one event, the effective price becomes much more competitive.
Best premium
Optimum Nutrition Gold Standard 100% Whey 1.6kg
900g bag
Optimum Nutrition Gold Standard delivers 24g protein per scoop and holds 4.6 stars across 55,000+ Amazon UK reviews. The default benchmark whey for buyers who want proven consistency over the lowest cost.
Buy Gold Standard 100% Whey 1.6kg →Live price at Optimum Nutritionor compare all UK prices →Best premium
Pros
- + 24g protein per scoop blended WPI WPC and hydrolysate
- + Most reviewed whey protein on Amazon UK with 55,000+ ratings
- + Instantised formulation mixes cleanly in cold water
- + 20+ flavour range with Double Rich Chocolate consistently 4.6 stars
Cons
- – Premium price tier above MyProtein and Bulk
- – Contains soy lecithin and artificial sweeteners
- – Smaller 450g tubs poor value vs 900g and 2.27kg sizes
●Nutrition per scoop · 23.7g protein in 30g▼
Protein makes up 79%
of this 30g scoop · 112 kcal total
Best reviewed: Protein Works Whey Protein 360
Protein Works flies under the radar on price but has the strongest review record of any brand here: 4.7 out of 5 on Trustpilot from more than 46,000 reviews, and 87 percent of Whey Protein 360 GOLD's own 432 reviews are five star. It is a phased-release blend with added digestive enzymes at 20g protein per 30g scoop, landing around 96p per 25g of protein. Not a budget buy, but the one people rate highest on taste and mixability.
Best reviewed
Protein Works Whey Protein 360 - GOLD Innovation
2.4kg bag
Protein Works Whey Protein 360 GOLD is the best-reviewed powder in this comparison, 4.7/5 on Trustpilot across 46,000+ reviews, with a phased-release blend and digestive enzymes. At roughly 96p per 25g it is a taste-and-trust buy rather than a budget one.
Buy Whey Protein 360 - GOLD Innovation →Live price at Protein Worksor compare all UK prices →Best reviewed
Pros
- + 4.7/5 on Trustpilot from over 46,000 reviews, the strongest record here
- + 87% of its 432 product reviews are five star
- + Phased-release blend with added digestive enzymes
- + 20g protein in a 110-calorie 30g scoop
Cons
- – About 96p per 25g, so mid-range rather than budget
- – 68g protein per 100g is lower than the cheaper isolate blends
- – Sale pricing swings a lot, so timing matters
●Nutrition per scoop · 20.4g protein in 30g▼
Protein makes up 68%
of this 30g scoop · 113 kcal total
How to actually compare
Don't compare total prices - compare price per 100g. A 2.5kg bag looks expensive next to a 1kg bag, but it's almost always cheaper per gram. Use the protein powder price comparison to see current prices across all retailers sorted by per-100g cost. You can also browse by type - whey concentrate, whey isolate, or vegan protein.
Also factor in any active discount codes - a 25% off code can make a seemingly expensive retailer the cheapest option overnight. Check the protein powder discount codes for today's best offers, or read MyProtein vs Bulk: which is cheaper? for a head-to-head breakdown.
How to choose the right protein powder
With so many options on the market, picking the right protein powder comes down to a few practical questions. First, consider your goals. If you are focused on muscle building after intense exercise, a whey protein powder with a complete amino acid profile - rich in essential amino acids like leucine - is the most effective choice. If you follow a plant-based diet, vegan protein powders made from pea, rice, or hemp blends can still deliver the plant proteins you need, though the amino acid profile is usually less complete per serving.
Next, think about when you will use it. A quick protein shake mixed with water is the simplest post workout option, but protein powder also works well blended into porridge, smoothies, or baking. The versatility makes it easier to hit your daily protein target as part of a balanced diet - especially if you struggle to get enough from whole foods alone. Government guidelines suggest most adults need around 0.75g of protein per kilogram of body weight, but anyone doing regular resistance training will likely benefit from a higher protein intake in the range of 1.6–2.2g per kilogram to support muscle mass and muscle repair.
Finally, do not overthink it. The difference between a good whey concentrate and a premium isolate matters less than consistency. Pick a product you can afford to buy every month, that you actually enjoy drinking, and that fits your macros. A protein boost from any reputable brand on this list will support your goals - the best protein powder is the one you will actually use. If you are not sure where to start, use the comparison tool to sort by price and find the cheapest option that matches your needs.
Shopping for a specific goal or audience? These companion guides drill into the picks that suit each one: best protein powder for weight loss, best protein powder for women, and best protein powder for beginners.
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1,958 products compared across 85+ UK retailers
Updated weekly. Sorted by best value per 25g of protein.
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