Black Friday Protein Deals UK 2026: How to Spot a Real Discount

Black Friday is when most people expect to buy protein cheaply, but a protein powder sale is only a deal if the price beats what the same bag has already sold for. WheyWise has recorded UK protein prices since April 2026, so this guide checks Black Friday against real price history rather than against a list price. We will add the live offers as each brand announces them.

When is Black Friday 2026 for protein deals?

Black Friday 2026 is on Friday 27 November, and Cyber Monday is on Monday 30 November. Watch prices across the whole week up to Cyber Monday, not just the Friday, and judge each offer against the lowest prices below.

How can you tell if a Black Friday protein deal is real?

Compare the Black Friday price with the lowest price the same bag has sold for, not with the list price beside it. Our records show that some of this year's lowest protein prices came well before November: the cheapest flavour of Optimum Nutrition Gold Standard 2.27kg was £80.00 on Amazon on 2 August, and it is £98.00 now.

The cheapest flavour on each day, from WheyWise price records. Optimum Nutrition tracked from July, Bulk on Amazon from July, Protein Works from August.

So a Black Friday price of, say, £90 on Gold Standard 2.27kg would look like a deal against today's £98.00, but it would still be dearer than August. Bulk Pure Whey has the same pattern on Amazon. Protein Works is the odd one out: its 2.4kg bag cost £43.99 to £45.99 in August and has stayed between £31.99 and £34.99 since September, so its everyday price is already close to its low. Check any product's movement on our price trends tool before you buy.

The second check is cost per 25g of protein. A “50% off” label tells you nothing until you know the pack size and the protein per 100g. Divide the price by the grams of protein in the pack and multiply by 25, or use the compare page, which does it for every product.

What protein powder is worth stocking up on for Black Friday?

The best thing to stock up on is the biggest bag of a whey you already like, at a cost per 25g of protein below what it has sold for this year. Our pick is Protein Works Whey Protein 360 Black in the 4.8kg bag: it costs 60p per 25g of protein at its everyday £68.49 on an OnTap subscription, or 53p with code WW12, without waiting for a sale.

Stocking up only saves money if you finish the bag. Protein powder carries a best before date rather than a use by date, and whey lasted at least 18 months at room temperature in a 2016 study, so a big bag kept sealed and dry is safe to buy ahead. At one 30g scoop a day, a 4.8kg bag lasts about 160 days. Our guide to whether protein powder expires covers storage in detail.

Worth stocking up on

Protein Works Whey Protein 360 Black

2.4kg bag

A low everyday price that most Black Friday offers will struggle to beat.

Buy Whey Protein 360 Black →Price at Protein Works

Exclusive WheyWise Code

WW12

Get 12% off your order

Search on Amazon ↗

or compare all UK prices →

Worth stocking up on

Protein Works Whey Protein 360 Black

2.4kg bag

Pros

• + 60p per 25g of protein in the 4.8kg bag at £68.49 on OnTap subscription
• + 53p per 25g of protein with code WW12, no sale needed
• + 2.4kg bag has held between £31.99 and £34.99 since September

Cons

• – 59g of protein per 100g, so a bigger scoop than an 80g whey
• – Buy a flavour you have tried before committing to 4.8kg

Pros

• 60p per 25g of protein in the 4.8kg bag at £68.49 on OnTap subscription
• 53p per 25g of protein with code WW12, no sale needed
• 2.4kg bag has held between £31.99 and £34.99 since September

Cons

• 59g of protein per 100g, so a bigger scoop than an 80g whey
• Buy a flavour you have tried before committing to 4.8kg

Buy Whey Protein 360 Black →Price at Protein Works

Exclusive WheyWise Code

WW12

Get 12% off your order

Search on Amazon ↗

or compare all UK prices →

●Nutrition per scoop · 17.7g protein in 30g▼

Protein makes up 59%

of this 30g scoop · 109 kcal total

17.7g

7.5g

Protein17.7g

Carbs7.5g

Fat1g

Other3.8g

If you are loyal to a brand whose price swings, such as Optimum Nutrition or Bulk on Amazon, Black Friday is worth waiting for, but set your target at the lowest price in the table above, not at the discount percentage.

Should you buy on a subscription or wait for flash sales?

For the lowest price, a sale on a big bag usually beats a subscription, and at Myprotein you cannot have both: its terms say special offers do not apply on top of a subscribe and save discount, except where the offer is about meeting a spend threshold. A subscription's real benefit is convenience, not the lowest price.

A permanent code sits in between. WW12 takes 12% off at Protein Works on every order, so you get a fixed saving without waiting for a sale or signing up to a schedule. If you value never running out more than the last few pence, a subscription is fine, and our guide to protein bundles and subscriptions compares them.

Do discount codes stack with Black Friday sales?

Usually not: most protein brands allow one code per order, so a Black Friday code replaces any other code rather than adding to it. Myprotein's terms allow one discount code per basket, and Protein Works says WW12 cannot be used with other codes.

The practical rule is to compare the two. If Protein Works runs a Black Friday code bigger than 12%, use it; if not, WW12 still works. Where a brand cuts its prices on the site without a code, add your code at checkout and the basket shows whether it applied. We have not yet confirmed whether WHEYWISE applies on top of Prozis or Vilgain sale prices, and we will update this section once we have checked it during the sales.

Which Black Friday protein deals should you skip?

Skip big percentage cuts on small tubs, because a small tub on sale can still cost more per gram of protein than the big bag at full price. Myprotein Impact Whey shows how: the 500g bag costs £1.42 per 25g of protein at £20.49, and even 25% off would only bring it to £1.07, no cheaper than the 2.7kg bag, which starts at £1.07 without any sale.

• Small tubs at a big percentage off. Check the cost per 25g of protein against the biggest bag before you buy.
• Bundles with shakers and samplers. They are priced for convenience. Divide the bundle price by the grams of protein inside.
• A flavour you have never tried, in a 4kg or 5kg bag. A cheap bag you will not finish is not a saving.
• More than you can finish before the best before date. Buy for the next few months, not the next two years.

Where to find the live Black Friday protein deals

The live deals will be on our deals page as soon as each brand publishes them, and the cheapest protein page re-ranks every powder by cost per 25g of protein as prices change. We will update this guide in late November with each brand's actual offer, checked against the lowest prices above. If you are deciding where to buy rather than when, read our guide to the best place to buy protein powder in the UK.

Frequently asked questions