UK Whey Protein Prices Are Rising in 2026 - Here’s How to Still Buy Cheap

UK whey protein prices have risen sharply since the start of 2025, driven by GLP-1 drug demand, global supply constraints, and retailer pricing strategies. Myprotein Impact Whey, Bulk Pure Whey and Optimum Nutrition Gold Standard have all increased their base prices, and all three now sit above £1 per 25g of protein. The cheap end of the market has not disappeared, but it has moved: it is now around 42p to 64p per 25g, and it belongs to different brands.

This is not a temporary blip. There are structural reasons behind the price increase, and they are unlikely to reverse quickly. But that does not mean you have to pay more than you need to. Here is what is driving the rise, which products still offer the best value, and how to keep your costs down.

Why is whey protein getting more expensive in 2026?

Three factors are pushing UK protein powder prices up simultaneously, and they are reinforcing each other.

GLP-1 drugs are driving new demand

Survey work by UCL puts self-reported use of weight loss medications among UK adults at roughly 3%, with a larger group saying they would be interested in using them within the year. That is a meaningful number of new buyers entering the protein market who were not there two years ago, and it is one of several demand shifts repricing the ingredient. For the wider mechanism see what actually drives UK protein powder prices. If this applies to you, we have a dedicated guide to the best protein powder for Mounjaro and GLP-1 users.

Processing capacity cannot keep up

Whey is a co-product of cheese manufacturing, but the constraint is not the liquid whey itself. Rabobank's assessment is that the bottleneck is the capacity to convert liquid whey into concentrate and isolate. US whey protein isolate hit a record $11 a pound in November 2025 and rose further into 2026. We break the mechanism down in full, with the commodity series and dates, in what actually drives UK protein powder prices.

Retailer pricing behaviour

Brands like Myprotein rely heavily on "sale" pricing - you rarely see anyone pay the listed RRP. But the RRP itself has been creeping upward, which means the discounted price you actually pay is also higher than it was last year. The headline discount looks the same ("40% off!") but the base it is applied to has shifted. Myprotein Impact Whey costs more per 100g in April 2026 than it did in April 2025, even at the same percentage discount. This is hard to spot unless you are tracking prices over time, which is exactly what WheyWise does.

How much more are UK buyers paying?

A 900g tub of Myprotein Impact Whey in a core flavour now costs £32.99 direct. A 1kg bag of Bulk Pure Whey costs the same £32.99 on Amazon. Buy either monthly and it adds up fast.

Whey isolate has been hit harder because it sits further along the processing chain. Premium isolate products have absorbed more of the raw material cost increase - some are up 10 to 12% year on year. Applied Nutrition ISO-XP and Bulk Pure Whey Isolate have both seen noticeable increases. If you are buying isolate primarily for its higher protein percentage rather than for lactose reasons, it may be worth reconsidering whether whey concentrate offers better value per gram of protein right now.

You can see where current prices sit across every UK retailer on the protein powder price comparison table.

Which protein powders are still cheap in the UK?

This is the part that has changed most. Myprotein Impact Whey and Bulk Pure Whey are no longer the two cheapest whey concentrates per gram of protein in the UK, and a discount code no longer closes the gap the way it did: Impact Whey sits around £1.16 per 25g at its 3.6kg size before any code. The cheap tier now belongs to brands with smaller marketing budgets, and to the entry-level lines the big brands do not advertise. Current figures sit on the cheapest protein table.

If you want to stay with a name you recognise, Bulk Basic Whey is the answer. It is the same manufacturer and quality controls as Pure Whey, but a whey and soya blend with 56g protein per 100g, and around 64p per 25g in the 2.5kg bag at £35.99, roughly 40 percent cheaper per gram than the Pure Whey most people buy by default. If you care only about price per gram, NutriSport 90+ is about 42p in the 5kg bag at £63.99, though it is a whey, casein, soy and rice blend.

Cheapest big brand

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 →Price at retailerView on Amazon ↗

or compare all UK prices →

Cheapest big brand

Bulk Basic Whey Protein

1.25kg bag

Pros

• + 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

Pros

• 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

Buy Basic Whey Protein →Price at retailerView on Amazon ↗

or compare all UK prices →

●Nutrition per scoop · 16.8g protein in 30g▼

Protein makes up 56%

of this 30g scoop · 92 kcal total

16.8g

8.4g

Protein16.8g

Carbs3.6g

Fat1.2g

Other8.4g

Cheapest overall

NutriSport 90+ Protein

5kg bag

Competitively priced protein powder from NutriSport. Good balance of quality and value.

Buy 90+ Protein →See the price on Amazon

Cheapest overall

NutriSport 90+ Protein

5kg bag

Pros

• + Competitive pricing
• + Very high protein content

Cons

• – Contains lactose

Pros

• Competitive pricing
• Very high protein content

Cons

• Contains lactose

Buy 90+ Protein →See the price on Amazon

●Nutrition per scoop · 45.6g protein in 60g▼

Protein makes up 76%

of this 60g scoop · 214 kcal total

45.6g

Protein45.6g

Carbs6g

Fat0.8g

Other7.6g

Impact Whey is still worth buying on an Impact Week code if you want the flavour range, which is unmatched. It just is not the cheapest route to protein any more.

Best on a code

MyProtein Impact Whey Protein Powder

900g bag

UK's bestselling whey concentrate with 82g protein per 100g. Regularly discounted 40-60% - never pay full price.

Buy Impact Whey Protein Powder →Price at MyproteinView on Amazon ↗

or compare all UK prices →

Best on a code

MyProtein Impact Whey Protein Powder

900g bag

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

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

Buy Impact Whey Protein Powder →Price at MyproteinView on Amazon ↗

or compare all UK prices →

●Nutrition per scoop · 21.6g protein in 30g▼

Protein makes up 72%

of this 30g scoop · 113 kcal total

21.6g

Protein21.6g

Carbs2.7g

Fat1.8g

Other3.9g

If you need an isolate from a recognisable brand, expect to pay well over £1 per 25g. Bulk Pure Whey Isolate, at 81g of protein per 100g, is about £1.30 per 25g in the 2.5kg bag on Amazon. For the full category breakdown, check the whey isolate comparison table. For more options, see our guide to Myprotein alternatives.

Seven ways to keep your protein costs down

1. Compare by cost per 25g of protein, not bag price

A 2.5kg bag at 45 pounds works out cheaper per gram of protein than a 1kg bag at 22 pounds - but you would never know that from the sticker price. The only fair way to compare protein powder is by normalising to a consistent unit. WheyWise converts every product to cost per 25g of protein so you can compare like for like regardless of bag size or brand.

2. Buy the largest size you will actually use

Bigger bags almost always offer the lowest per-gram cost. Myprotein Impact Whey in the 3.6kg bag is £1.16 per 25g of protein, against £1.27 in the 900g tub. But only buy what you will realistically finish. A 5kg bag that sits in your cupboard for six months is not a saving.

3. Do not default to one brand

Brand loyalty costs money when prices are rising. Myprotein is not always the cheapest. Bulk, Applied Nutrition, Protein Works, and smaller brands regularly undercut the big names - sometimes by a significant margin. Compare whey concentrate prices across all UK brands, or check the best alternatives to Myprotein if you have not looked beyond your usual brand recently.

4. Time your purchase around sales events

Bank holiday weekends, Black Friday, and payday promotions can drop prices 20 to 30%. If you can wait a week for a sale rather than buying at full price, the saving is real. Check the protein powder deals and discount codes for what is live right now.

5. Stack discount codes on top of sales

Active discount codes can knock 5 to 15% off an already reduced price. WheyWise surfaces verified codes from major UK retailers on the live discount codes page, checked daily. Stacking a code on top of a sale is the single fastest way to reduce your cost per serving.

6. Consider concentrate over isolate

If you do not specifically need low-lactose or ultra-high protein purity, whey concentrate delivers 70-82g of protein per 100g at 15 to 25% less cost than whey isolate. The protein content difference (roughly 80g vs 90g per 100g) rarely justifies the price gap for most people. Read the full whey isolate vs concentrate breakdown for the detail.

7. Check prices weekly - the cheapest brand rotates

The cheapest protein powder in the UK changes every week depending on who is running a promotion. Last week's best deal may not be this week's. This is the entire reason WheyWise exists - automated price checks across every UK retailer we track so you do not have to open ten tabs and do the maths yourself. For more tactics, read our guide to the cheapest way to buy protein powder in the UK.

Why does price comparison matter more now?

When prices are stable, buying from the same brand every month is fine - the difference between retailers is small and predictable. When prices are rising, that gap widens. The spread between the cheapest and most expensive whey concentrate in the UK can be 10 pounds or more per kilogram right now.

WheyWise tracks over our full catalogue across every UK retailer we track, all normalised to cost per 25g of protein. It exists precisely for moments like this - when the market is shifting and the only way to know you are getting a fair price is to see every price side by side.

Whey prices may stay elevated through 2026 as GLP-1 adoption continues to grow and global supply adjusts. The smartest response is not to stop buying protein - it is to buy smarter. Use the protein calculator to find your daily target, then check the protein powder comparison table to find the best value today.