Is Bulk Expensive? It Depends Entirely on Which Bulk You Buy
Bulk Pure Whey costs nearly twice what Bulk Basic Whey costs per gram of protein, and Basic Whey has marginally more protein per 100g. Which Bulk products are expensive, which are not, and why the default choice is the wrong one.
Kevin, founder of WheyWise
Quick answer
Bulk is cheap or expensive depending entirely on which bag you pick, and most people pick the dear one. WheyWise price checks on 21 August 2026 put Bulk Pure Whey Protein at about 95p per 25g of protein and Bulk Basic Whey Protein at about 50p. Basic Whey is not the compromise the name suggests: at 72g of protein per 100g it is marginally ahead of Pure Whey's 71g. So the cheaper bag has slightly more protein and costs 45p a serving less. Across the full range Bulk runs from about 44p to about £2.19 per 25g of protein, and the pattern is the same as everywhere else: big bags cheap, clear and diet formats expensive.
Is Bulk expensive?
Bulk is not an expensive brand, but the Bulk product most people buy is one of its expensive ones. At last check on 21 August 2026, Bulk Pure Whey Protein works out at about 95p per 25g of protein while Bulk Basic Whey Protein works out at about 50p. Same manufacturer, same website, nearly double the cost per gram.
The part that makes this worth writing down is that the cheaper bag is not worse. Basic Whey is 72g of protein per 100g. Pure Whey is 71g. The bag that costs 45p less per serving has marginally more protein in it. The difference you are paying for is flavour range and reputation, not protein.
The Bulk range by cost per 25g of protein
Sticker price is useless here because Bulk sells in everything from 500g to 5kg. Cost per 25g of protein is the comparable number, and it is the metric WheyWise ranks by.
| Product | Protein per 100g | Best price found | Cost per 25g protein |
|---|---|---|---|
| Diet Whey Protein (4kg) | 68g | £47.89 / 4kg | 44p |
| Pea Protein Isolate | 78g | £34.99 / 2.5kg | 45p |
| Soya Protein Isolate | 84g | £14.99 / 1kg | 45p |
| Basic Whey Protein | 72g | £35.99 / 2.5kg | 50p |
| Beef Protein Isolate 97 | 97g | £24.98 / 1kg | 64p |
| Vegan Protein Powder | 69g | £45.99 / 2.5kg | 67p |
| Micellar Casein | 80g | £67.99 / 2.5kg | 85p |
| Pure Whey Protein (5kg) | 71g | £134.99 / 5kg | 95p |
| Informed Whey Protein | 81g | £79.99 / 2.27kg | £1.09 |
| Natural Pure Whey Isolate | 84g | £104.99 / 2.5kg | £1.25 |
| Clear Whey Isolate | 80g | £25.99 / 500g | £1.62 |
| Clear Vegan Protein | 80g | £41.99 / 600g | £2.19 |
Prices checked 21 August 2026 across the UK retailers we track. Cheapest publishable variant per product.
Top of the table is 44p, bottom is £2.19, a spread of roughly five times inside one brand. Every cheap row is a large bag of a plain powder. Every expensive row is a small tub of something with a format attached to it.
The one to actually buy
Bulk Basic Whey Protein
1.25kg bag
The single best-value product Bulk makes, and the answer to whether the brand is expensive. About 50p per 25g of protein at 72g per 100g, checked 21 August 2026, which is roughly half the cost per gram of the bag most people put in the basket instead.
or compare all UK prices →The one to actually buy
Bulk Basic Whey Protein
1.25kg bagPros
- + About 50p per 25g of protein, roughly 45p a serving less than Bulk's own Pure Whey
- + 72g of protein per 100g, marginally ahead of Pure Whey at 71g despite costing half as much per gram
- + One of the cheapest wheys available from a brand with a UK trading history rather than a marketplace listing
Cons
- – Narrower flavour range than Pure Whey, which is the actual reason to pay the difference
- – Sits directly beside Pure Whey on Bulk's own site with a name that implies it is the lesser product
●Nutrition per scoop · 21.6g protein in 30g▼
Protein makes up 72%
of this 30g scoop · 112 kcal total
The one most people buy
Bulk Pure Whey Protein
1kg bag
Not a bad product, but a hard one to justify against its own stablemate. At about 95p per 25g of protein against Basic Whey's 50p, you are paying about 45p a serving for flavour choice and a familiar name.
or compare all UK prices →The one most people buy
Bulk Pure Whey Protein
1kg bagPros
- + The widest flavour range Bulk offers, which is a real reason to choose it over Basic Whey
- + Sold in 5kg, so it is one of the largest single purchases available from a mainstream UK brand
- + Long track record and the most-reviewed product in the range
Cons
- – About 95p per 25g of protein, roughly double Bulk Basic Whey for 1g per 100g less protein
- – 71g of protein per 100g is mid-table for a whey concentrate at this price point
- – The 5kg bag is a large commitment to a flavour, and buying smaller pushes the per-gram cost higher still
●Nutrition per scoop · 22.7g protein in 32g▼
Protein makes up 71%
of this 32g scoop · 120 kcal total
Why Pure Whey costs nearly twice what Basic Whey costs
It is not protein content. Checked 21 August 2026, Basic Whey is 72g of protein per 100g and Pure Whey is 71g. On the metric that decides value, the cheaper product is fractionally ahead.
What Pure Whey buys you is choice and familiarity. It carries the wider flavour range, it is the product Bulk markets, and it has the longer review record. For someone who is going to drink the same shake every day for four months, flavour choice is not nothing. But it should be a deliberate 45p per serving, which over a year of daily shakes is roughly £164.
The naming does a lot of work here. "Basic" reads as the entry-level compromise and "Pure" reads as the upgrade, and the protein figures say those labels are the wrong way round on the one metric that matters most. This is the single most useful thing to know before buying from this brand.
Is Bulk dearer than MyProtein and Protein Works?
On entry-level products, Bulk is the cheapest of the three by a clear margin. Bulk Basic Whey at about 50p per 25g of protein undercuts Protein Works Whey Protein 360 GOLD at about 72p and MyProtein Impact Whey at about 91p, and it is less than half Optimum Nutrition Gold Standard at about £1.10.
On flagship products the ordering reverses. Bulk Pure Whey at about 95p is dearer than Protein Works Whey Protein 360 GOLD at 72p and slightly dearer than MyProtein Impact Whey at 91p.
So the answer to whether Bulk is cheaper than its rivals is: only if you buy its cheap product. Compare the same tier and Bulk wins. Compare the products each brand puts on its own homepage and Bulk is mid-table. The full ranking sits on the cheapest protein powder comparison, and the protein comparison tool will put any two of them side by side.
Has Bulk changed its formula?
Our data shows Bulk Pure Whey Protein at 71g of protein per 100g as of 21 August 2026. UK buyers on Reddit reported in March 2026 that this had come down from a previous 77g per 100g, and that the scoop size had gone up from 30g to 32g at the same time, which leaves the advertised protein-per-serving figure on the front of the bag unchanged.
We should be careful about what we can and cannot confirm. We hold current nutrition data, not historical, so we can verify that Pure Whey is 71g per 100g today but not that it was 77g before. Treat the change itself as a community report rather than something we have measured.
What the episode does illustrate is why per-serving claims are the wrong thing to compare on. If a scoop grows and the protein percentage falls by the same proportion, the front of the bag reads identically while every kilogram you buy contains less protein. That is exactly the arithmetic a per-100g figure catches and a per-serving figure hides, and it is why cost per 25g of protein is the number we rank on.
When Bulk is genuinely cheap
Three places. The 4kg Diet Whey Protein at about 44p per 25g of protein is the cheapest thing in the range, though the diet formulation means it is not a straight whey. The plant isolates are excellent value: Pea Protein Isolate and Soya Protein Isolate both land around 45p, which is competitive with anything on the market.
And Beef Protein Isolate 97 at 97g of protein per 100g for about 64p per 25g is worth a look for anyone who is dairy-free and had assumed isolates were out of budget. Beef protein sits outside the whey commodity market that has driven dairy protein prices up since 2024, which is why it prices the way it does.
Where Bulk stops being cheap is the clear range. Clear Vegan Protein at about £2.19 per 25g of protein is roughly five times the cost per gram of the brand's own soya isolate. That is a format premium, and a large one.
Is Bulk worth it?
Buy Basic Whey and Bulk is one of the best-value protein brands in the UK. Buy Pure Whey and it is mid-table. Buy anything clear and it is expensive. The brand is not the variable, the product line is.
If you take one thing from this: before you check out, look at what Basic Whey costs next to whatever is in your basket. The name suggests a compromise and the protein figures say otherwise, and that single comparison is worth about £164 a year to a daily shake drinker.
Current prices across the whole range are on the Bulk brand page. For the head to head people search for most, see MyProtein vs Bulk on price, and there is a product-level Impact Whey vs Pure Whey comparison too. If you have not settled on a type yet, the protein finder takes about a minute, and the cheapest protein powder in the UK covers what sits below Bulk on price.
Frequently asked questions
Is Bulk expensive compared to other UK protein brands?
It depends which product. Checked 21 August 2026, Bulk Basic Whey Protein works out at about 50p per 25g of protein, which is one of the cheapest options from a recognised UK brand. Bulk Pure Whey Protein works out at about 95p, which is more expensive than Protein Works Whey Protein 360 GOLD at 72p and close to MyProtein Impact Whey at 91p. The brand is not expensive. Its best-known product is.
What is the difference between Bulk Pure Whey and Bulk Basic Whey?
Less than the price gap suggests. Checked 21 August 2026, Basic Whey is 72g of protein per 100g at about 50p per 25g of protein, and Pure Whey is 71g per 100g at about 95p. Basic Whey has marginally more protein per 100g and costs about 45p a serving less. Pure Whey has a wider flavour range and a longer track record, which is what the difference actually buys.
Which Bulk product is the cheapest per gram of protein?
Bulk Diet Whey Protein in the 4kg size at about 44p per 25g of protein, checked 21 August 2026, followed by Pea Protein Isolate and Soya Protein Isolate at about 45p. Bulk Basic Whey at about 50p is the cheapest straightforward whey concentrate.
Has Bulk put its prices up or changed its formula?
Our data shows Bulk Pure Whey Protein at 71g of protein per 100g as of 21 August 2026. UK buyers on Reddit reported in March 2026 that this had been reduced from a previous 77g while the scoop size increased from 30g to 32g, which keeps the advertised per-serving protein figure unchanged. We do not hold historical protein content, so we can confirm today's figure but not the change itself. Either way, 71g per 100g is what you are buying now.
Is Bulk cheaper than MyProtein?
On the entry-level products, yes and by a lot: Bulk Basic Whey at about 50p per 25g of protein against MyProtein Impact Whey at about 91p, checked 21 August 2026. On the flagship products they are close, with Bulk Pure Whey at about 95p and Impact Whey at about 91p.
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