Best Cheap Protein Powder UK 2026: Value Picks Checked
The best cheap and best value protein powders in the UK, ranked by cost per 25g of protein with every label checked, plus the cheap wheys that quietly cut the protein content.
Kevin, founder of WheyWise
Quick answer
The best cheap protein powder we checked is Protein Works Vegan Soy Protein Black at 36p per 25g of protein, with 84g of protein per 100g, checked 23 September 2026. If you want whey, NutriSport Whey Protein Isolate costs about 46p per 25g of protein in the 5kg bag on Amazon, and Bulk Basic Whey Protein costs 61p in the 2.5kg bag. Cheap is not always good value, though: Bulk Basic Whey Protein and Protein Works Whey Protein 360 Black both contain just 59g of protein per 100g, so check the label, not just the price. WheyWise checked every price and label in this guide at the retailer.
Cheap protein powder is easy to find. Cheap protein powder that is still good value is harder, because the cheapest bags often carry less protein per scoop. This guide ranks the options by cost per 25g of protein, which allows for bag size and protein content, and every price and nutrition label was checked at the retailer in September 2026. For whichever powder is cheapest today across every retailer we track, use the WheyWise price comparison.
What is the best cheap protein powder in the UK?
The best cheap protein powder we checked is Protein Works Vegan Soy Protein Black, at 36p per 25g of protein in the 4kg bag at £47.99, checked 23 September 2026. Protein Works Vegan Soy Protein Black contains 84g of protein per 100g, so it is cheap without cutting protein. If you want whey, these are the picks:
| Pick | Product | Protein per 100g | Cost per 25g of protein |
|---|---|---|---|
| Cheapest overall | Protein Works Vegan Soy Protein Black | 84g | 36p |
| Cheapest whey | NutriSport Whey Protein Isolate | 76.5g | about 46p |
| Cheap vegan blend | Protein Works Vegan Protein 360 Black | 79g | 48p |
| Best-known cheap whey | Bulk Basic Whey Protein | 59g | 61p |
| Cheap whey with a code | Protein Works Whey Protein 360 Black | 59g | 65p |
Largest bag of each, one-off prices with no code applied, checked 22 and 23 September 2026 on theproteinworks.com, bulk.com and amazon.co.uk. The Protein Works product cards can show the lower OnTap subscription price from our feed.
Cheapest protein we checked
Protein Works Vegan Soy Protein Black
1kg bag
The lowest cost per gram of protein we found anywhere, from a brand with a strong review record.
or compare all UK prices →Cheapest protein we checked
Pros
- + Costs 36p per 25g of protein in the 4kg bag, checked 23 September 2026
- + Contains 84g of protein per 100g, so cheap without cutting protein
- + 41% cheaper per gram of protein than Bulk Basic Whey Protein
Cons
- – Soy rather than whey, which not everyone wants
- – The 4kg bag is a big upfront spend; the 500g bag costs more per gram
●Nutrition per scoop · 25.2g protein in 30g▼
Protein makes up 84%
of this 30g scoop · 110 kcal total
Which cheap protein powder costs least per gram of protein?
Protein Works Vegan Soy Protein Black costs least per gram of protein of everything we checked, at 36p per 25g of protein, checked 23 September 2026. NutriSport Whey Protein Isolate is the cheapest whey at about 46p per 25g of protein, which makes it 25% cheaper per gram of protein than Bulk Basic Whey Protein at 61p. Myprotein Impact Whey, at £1.16 per 25g of protein in its largest bag, costs almost twice as much as Bulk Basic Whey Protein.
| Product | Bag and price | Protein per 100g | Cost per 25g of protein |
|---|---|---|---|
| Protein Works Vegan Soy Protein Black | 4kg, £47.99 | 84g | 36p |
| NutriSport Whey Protein Isolate | 5kg, £69.99 | 76.5g | about 46p |
| Protein Works Vegan Protein 360 Black | 4kg, £60.99 | 79g | 48p |
| Bulk Basic Whey Protein | 2.5kg, £35.99 | 59g | 61p |
| Protein Works Whey Protein 360 Black | 4.8kg, £73.49 | 59g | 65p |
| Myprotein Impact Whey | 3.6kg, £119.99 | 72g | £1.16 |
| Protein Works Clear Diet Whey Protein Gold | 500g, £23.99 | 82g | £1.46 |
Is the cheapest protein powder the best value?
Not always. The cheapest wheys often keep the price down by carrying less protein. Bulk Basic Whey Protein and Protein Works Whey Protein 360 Black both contain 59g of protein per 100g, which is 18g of protein in a 30g scoop. Myprotein Impact Whey contains 72g of protein per 100g in Vanilla, and Optimum Nutrition Gold Standard 100% Whey contains 76g in Double Rich Chocolate.
That is why this guide ranks on cost per 25g of protein rather than price per bag. A low figure here is a real saving even after the lower protein content, but it also means you need a bigger scoop to hit the same protein. If protein per scoop matters to you, the isolate and soy picks above give you both a low price and a high protein content. Our guide on whether cheap whey protein is any good goes further into quality.
What is the best cheap whey protein?
NutriSport Whey Protein Isolate is the cheapest whey we checked, at about 46p per 25g of protein in the 5kg bag at £69.99 on Amazon, sold by UKESUPPS-2016 and checked 22 September 2026. NutriSport's own label shows 76.5g of protein per 100g. The Amazon listing claims at least 84% protein and lists pea fibre among its ingredients, so we have used the lower label figure.
Cheapest whey we checked
NutriSport Whey Protein Isolate Powder
5kg bag
The lowest-cost whey we could verify, with a protein content well above the cheapest concentrates.
Buy Whey Protein Isolate Powder →See the price on AmazonCheapest whey we checked
Pros
- + About 46p per 25g of protein in the 5kg bag, checked 22 September 2026
- + Contains 76.5g of protein per 100g on NutriSport's own label
- + 25% cheaper per gram of protein than Bulk Basic Whey Protein
Cons
- – Sold through an Amazon marketplace seller, not direct
- – The 5kg bag is a big commitment for one flavour
●Nutrition per scoop · 22.9g protein in 30g▼
Protein makes up 76%
of this 30g scoop · 97 kcal total
Bulk Basic Whey Protein is the best-known cheap whey, at 61p per 25g of protein in the 2.5kg bag at £35.99 on bulk.com, checked 22 September 2026. That price was a sale, down from £47.99, which works out at 81p per 25g of protein at full price. Protein Works Whey Protein 360 Black costs 65p per 25g of protein in the 4.8kg bag at £73.49, checked 23 September 2026, and the code WW12 took 12% off it in our basket test on 22 September 2026.
Best-known cheap whey
Bulk Basic Whey Protein
1.25kg bag
A cheap, easy-to-buy whey from a big brand, as long as you accept a lower protein content per scoop.
or compare all UK prices →Best-known cheap whey
Bulk Basic Whey Protein
1.25kg bagPros
- + 61p per 25g of protein in the 2.5kg bag on sale, checked 22 September 2026
- + Sold direct by Bulk, a large UK brand
- + About half the cost per gram of protein of Myprotein Impact Whey at list price
Cons
- – Contains 59g of protein per 100g, 18g in a 30g scoop
- – 81p per 25g of protein when the sale ends
●Nutrition per scoop · 17.7g protein in 30g▼
Protein makes up 59%
of this 30g scoop · 96 kcal total
What is the best cheap vegan protein powder?
Protein Works Vegan Soy Protein Black is the best cheap vegan protein powder we checked, at 36p per 25g of protein. If you prefer a blend, Protein Works Vegan Protein 360 Black costs 48p per 25g of protein in the 4kg bag at £60.99 and contains 79g of protein per 100g, both checked 23 September 2026. The soy undercuts every whey on this page, and the blend undercuts every whey except NutriSport Whey Protein Isolate at about 46p, because plant isolates carry more protein per 100g. For every plant-based option, see the best vegan protein powder UK guide.
Is Myprotein cheap?
Not at list price. Myprotein Impact Whey costs £1.16 per 25g of protein in the 3.6kg bag at £119.99, checked 22 September 2026, which is 90% more per gram of protein than Bulk Basic Whey Protein at 61p. Myprotein runs sitewide sales often, and on 22 September it was taking an extra 10% off all protein powders at the basket, so it is worth checking during a sale. Our guide on why Myprotein is so expensive explains its pricing, and Myprotein alternatives UK lists cheaper brands.
Is there a cheap clear whey?
Clear whey is never really cheap. Of the clear wheys we checked, Protein Works Clear Diet Whey Protein Gold costs least at £1.46 per 25g of protein in the 500g bag at £23.99, with 82g of protein per 100g, checked 23 September 2026. That is still more than twice the cost per gram of protein of Bulk Basic Whey Protein. For the full picture, see the clear whey comparison.
How can you pay less for protein powder?
- Buy the biggest bag you will finish. Protein Works Vegan Protein 360 Black costs 60p per 25g of protein in the 500g bag but 48p in the 4kg bag, checked 23 September 2026. Our guide to the cheapest way to buy protein powder has more ways to cut the cost.
- Use a working code. WW12 takes 12% off at Protein Works. We track live codes on the deals page.
- Wait for a sale on the big brands. Myprotein and Bulk both run frequent sales, and Bulk Basic Whey Protein was 25% off when we checked.
- Consider a subscription. Protein Works OnTap prices were about 15% below the one-off price on the products that offer it.
- Compare by cost per 25g of protein, not price per bag. That is the only figure that allows for both bag size and protein content.
Frequently asked questions
What is the best cheap protein powder in the UK?
Protein Works Vegan Soy Protein Black is the cheapest good protein we checked, at 36p per 25g of protein in the 4kg bag with 84g of protein per 100g, checked 23 September 2026. For whey, NutriSport Whey Protein Isolate costs about 46p per 25g of protein in the 5kg bag on Amazon and Bulk Basic Whey Protein costs 61p in the 2.5kg bag.
What is the best value protein powder in the UK?
Best value means the lowest price for protein you can actually use, not the lowest sticker price. On that measure Protein Works Vegan Soy Protein Black leads at 36p per 25g of protein with 84g of protein per 100g. Among wheys, NutriSport Whey Protein Isolate at about 46p combines a low price with 76.5g of protein per 100g, where the cheapest concentrates carry only 59g.
Is cheap whey protein any good?
Often yes, but read the label. Bulk Basic Whey Protein and Protein Works Whey Protein 360 Black both contain 59g of protein per 100g, well below the 72g to 76g of Myprotein Impact Whey or Optimum Nutrition Gold Standard. Cost per 25g of protein already allows for that, so a low figure is still a real saving, but each scoop gives you less protein.
Is Myprotein the cheapest protein powder?
Not at list price. Myprotein Impact Whey costs £1.16 per 25g of protein in the 3.6kg bag at £119.99, checked 22 September 2026, almost twice the 61p of Bulk Basic Whey Protein. Myprotein runs frequent sitewide sales, so it can get much closer while a sale is on.
Where can I find the cheapest protein powder today?
Prices change weekly, so use the WheyWise price comparison, which ranks protein powders from UK retailers by cost per 25g of protein. This guide picks the best cheap options with their labels checked; the comparison shows whichever is cheapest right now.
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