Quick answer
Of the powders we have fully reviewed, the best value for muscle gain right now is Protein Works Whey Protein 360 - GOLD Innovation. It costs 62p per 25g of protein in the 4.8kg pack (£81.49 at Protein Works, the subscribe price) and gives you 20g of protein a scoop. If you compete in a drug-tested sport, pay a little more for Applied Nutrition Critical Whey, which is Informed Sport batch-tested, at 96p per 25g. Prices last checked 27 October 2026.
This page has one job: to tell you which protein powder gives you the most muscle-building protein for your money right now. Brands do not pay for their position, and the ranking redraws itself as prices change.
Every figure below comes from two places. Protein per scoop and calories come from labels we checked by hand for our protein reviews. Prices come from UK retailers and are re-checked daily, most recently on 27 October 2026.
What is the best value protein powder for muscle gain today?
Here are today's picks for five different buyers. Each one links to its full review, where you can see every retailer and pack size we found.
What counts as good value for muscle gain?
A cheap tub is not the same as good value. For building muscle, we look at six things, starting with the one we rank on.
- Cost per 25g of protein. What you pay for one proper dose of protein. This is the number we rank on, because it is the only fair way to compare tubs of different sizes and strengths.
- Protein per serving. How much protein one scoop gives you. The research points to 20 to 40g a serving, so a scoop under 20g means you need more powder per shake.
- Protein per 100g. How much of the powder is actually protein. The rest is carbs, fat, flavouring and thickeners.
- Pack price. A big bag is usually cheapest per gram, but not everyone wants to spend £80 or more at once. Our budget pick caps the pack at £30.
- Calories and carbs. These only matter if you are struggling to gain weight. Then extra calories help, and a mass gainer might suit you better.
- Testing and diet. If you compete in a drug-tested sport, you need a powder that is batch-tested by Informed Sport. If you avoid dairy, you need a vegan powder, which we rank separately.
Live table: muscle-gain powders ranked by cost per 25g
These are the 19 powders from our reviews with a price checked in the last 14 days. The cheapest per 25g of protein comes first. Diet wheys are left out because they are made for cutting, not building.
| Product | Best current UK retailer | Pack | Protein a serving | Cost per 25g protein | Calories a serving | Best for | Price checked |
|---|---|---|---|---|---|---|---|
| Protein Works Whey Protein 360 - GOLD Innovation | Protein Works* | 4.8kg, £81.49 | 20g in 30g | 62p | 111 kcal | Best overall | 26 Oct |
| NXT Nutrition Beef Protein Isolate | Amazon UK | 1.8kg, £46.99 | 27g in 30g | 73p | 110 kcal | Most protein per scoop | 25 Oct |
| MyProtein Impact Whey Protein | MyProtein | 1kg, £25.99 | 21.6g in 30g | 90p | 115 kcal | Whey concentrate | 26 Oct |
| Applied Nutrition Critical Whey | Amazon UK | 2.01kg, £55.95 | 24g in 33g | 96p | 128 kcal | Best for drug-tested athletes | 25 Oct |
| Warrior Whey | Amazon UK | 1kg, £28.71 | 35.6g in 50g | £1.01 | 194 kcal | Whey concentrate | 27 Oct |
| Prozis Clear Whey Isolate | Prozis | 500g, £17.03 | 20.3g in 25g | £1.05 | 91 kcal | Clear whey | 13 Oct |
| USN Blue Lab Whey | Amazon UK | 2kg, £58.88 | 24g in 34g | £1.05 | 126 kcal | Whey concentrate | 18 Oct |
| Bulk Pure Whey Protein | Amazon UK | 5kg, £149.99 | 23g in 32g | £1.06 | 121 kcal | Whey concentrate | 27 Oct |
| Scitec Nutrition 100% Whey Protein Professional | Amazon UK | 1.82kg, £58.90 | 22g in 30g | £1.11 | 111 kcal | Whey concentrate | 25 Oct |
| PER4M Nutrition Whey Protein | Amazon UK | 2.01kg, £62.99 | 21g in 30g | £1.12 | 112 kcal | Whey blend | 25 Oct |
| PER4M Nutrition Isolate Zero | Amazon UK | 2kg, £79.99 | 26g in 30g | £1.15 | 110 kcal | Whey isolate | 25 Oct |
| Prozis 100% Whey Hydro Isolate ULTIMATE SERIES | Prozis | 900g, £34.74 | 25.7g in 31g | £1.16 | 120 kcal | Whey isolate | 14 Oct |
| Applied Nutrition ISO XP | Amazon UK | 1.8kg, £76.40 | 22.5g in 25g | £1.18 | 89 kcal | Whey isolate | 25 Oct |
| Protein Works Whey Protein 360 - PLATINUM Innovation | Amazon UK | 600g, £20.34 | 24g in 35g | £1.23 | 127 kcal | Whey blend | 27 Oct |
| MyProtein Impact Whey Isolate | MyProtein | 2.88kg, £121.99 | 25g in 30g | £1.29 | 108 kcal | Whey isolate | 26 Oct |
| Prozis Supreme Whey Protein | Prozis | 907g, £39.26 | 24g in 30g | £1.35 | 113 kcal | Whey blend | 14 Oct |
| Bulk Pure Whey Isolate | Amazon UK | 2.5kg, £111.99 | 24g in 30g | £1.38 | 108 kcal | Whey isolate | 27 Oct |
| Bulk Clear Whey Isolate | Amazon UK | 500g, £25.99 | 20g in 25g | £1.62 | 86 kcal | Clear whey | 25 Oct |
Vegan protein for muscle gain
Plant protein is ranked on its own and never against whey, because it is a different choice for a different buyer.
| Product | Best current UK retailer | Pack | Protein a serving | Cost per 25g protein | Calories a serving | Best for | Price checked |
|---|---|---|---|---|---|---|---|
| Prozis 100% Vegan Protein | Prozis | 700g, £18.63 | 21g in 30g | 95p | 118 kcal | Best vegan | 14 Oct |
The table only covers powders we have reviewed in full. To rank every protein we track, use the protein comparison table, which sorts by the same cost per 25g of protein.
Why can price per tub or per kilo mislead you?
The price on the tub tells you what you pay today. It does not tell you how much protein you get for it.
Here is an example with made-up round numbers. Tub A is 1kg for £20 and is 60% protein. Tub B is 1kg for £24 and is 80% protein, so per kilo Tub A looks £4 cheaper.
Tub A gives you 600g of protein, so 25g costs 83p. Tub B gives you 800g, so 25g costs 75p. The “dearer” tub is about 10% cheaper for the thing you are actually buying it for.
Scoop sizes cause the same problem. A brand can quote a big number of servings by using a small scoop, so you end up needing two. Our step-by-step guide to cost per serving shows how to work it out for any tub.
Does a premium brand build more muscle?
No. Your muscles respond to how much protein you eat across the day and to how you train. They do not respond to the logo on the tub.
The International Society of Sports Nutrition's position stand on protein and exercise recommends 1.4 to 2.0g of protein per kg of bodyweight a day for people who train, in servings of about 20 to 40g. A 2018 review of 49 trials found that extra protein stopped adding muscle above about 1.6g per kg a day.
So the target is the same whichever brand you buy. Any whey that gets you to those numbers will do the job, and the cheapest way to get there is the powder with the lowest cost per 25g. We look at where the extra money goes in premium tubs in cheap vs expensive protein powder.
Paying more can still buy real things: nicer flavours, an isolate that sits better if dairy upsets you, or batch testing for drug-tested athletes. Those are good reasons. Bigger muscles are not one of them.
Which one should you buy?
Buy this if your priority is the lowest long-term cost: Protein Works Whey Protein 360 - GOLD Innovation (62p per 25g of protein). Get the biggest pack you will finish before its best-before date, because bigger packs are almost always cheaper per gram.
Buy this if you need at least 20g of protein per scoop: our best overall pick only counts powders with 20g or more a scoop. For a full 25g or more in one scoop, the cheapest today is NXT Nutrition Beef Protein Isolate (73p per 25g of protein).
Buy this if you do not want to spend more than £30 at once: Protein Works Whey Protein 360 - GOLD Innovation (73p per 25g of protein). You pay a little more per gram, but less up front.
Buy this if you are drug-tested: Applied Nutrition Critical Whey (96p per 25g of protein). Check the batch on the UK Anti-Doping supplement guidance before you compete.
Choose a mass gainer only if calories, not protein, are holding you back. A scoop of protein powder adds roughly 90 to 200 calories, so if the scales will not move, you need more food. Compare options on the mass gainer comparison.
How does WheyWise rank these powders?
WheyWise checks UK retailer prices daily and ranks muscle-gain protein powders by the cost of delivering 25g of protein, not by brand name or headline tub price.
- Labels are checked by hand. Protein, calories and serving sizes come from the brand's own label, not from shop listings, which are often wrong.
- Prices must be fresh. A price older than 14 days is dropped, not shown. Each row shows the day it was checked.
- We show the shelf price. No discount codes are taken off, and subscribe-and-save prices are labelled.
- Vegan and whey are ranked apart. They suit different buyers, so they never compete for the same spot.
- Commission never sets the order. We earn from some links, as our affiliate disclosure explains, but only cost per 25g of protein decides the ranking.
One honest limit: we only show prices from retailers we link to, so now and then a product may be cheaper in a shop we do not track.
Where can you compare more?
- The protein comparison table ranks every protein powder we track by cost per 25g.
- The head-to-head protein comparison tool puts any two powders side by side.
- The mass gainer comparison is for when calories are the problem.
- Our cost per serving method explains the maths behind every ranking on WheyWise.
- The best protein powder for muscle gain guide covers how much protein you need, timing, and whey vs casein.
Frequently asked questions
What is the best value protein powder for muscle gain in the UK?
The powder with the lowest cost per 25g of protein that still gives you at least 20g of protein a scoop. That changes as retailers change their prices, so WheyWise ranks it live on this page from prices checked in the last 14 days, and names the current winner at the top.
Is cost per 25g of protein better than price per kilo?
Yes, for muscle gain. Price per kilo treats every kilo of powder as equal, but one powder can be 60% protein and another 80%. Cost per 25g of protein tells you what you pay for the part that builds muscle, so you can compare any two tubs fairly.
Do expensive protein powders build more muscle?
No. The research does not show that. Muscle gain depends on how much protein you eat across the day and on your training, and the International Society of Sports Nutrition recommends 1.4 to 2.0g per kg of bodyweight a day and 20 to 40g a serving. Any whey that hits those numbers does the job.
Do I need a mass gainer to bulk?
Only if you struggle to eat enough calories. A scoop of protein powder adds roughly 90 to 200 calories, while a mass gainer adds far more, mostly from carbohydrate. If you are not gaining weight on your normal diet plus protein, a mass gainer is the easier fix; if you are, it is an expensive way to buy carbs.
How often does WheyWise check these prices?
Every day. WheyWise checks UK retailer prices daily, and this page rebuilds its ranking every day from the latest checks. Each row shows the date its price was checked, and any price older than 14 days is left out rather than shown stale.
Does WheyWise get paid by the brands it ranks?
We earn a commission when you buy through some of our links, and we only show prices from retailers we link to. The order is always set by cost per 25g of protein, never by commission or brand. A product can occasionally be cheaper at a shop we do not track.
