Buying Guide

Are Black Friday Protein Deals Really Cheaper? What the Evidence Shows

Which? found 98% of Black Friday deals were the same price or cheaper at other times. 28 past protein offers show what the discount badge does and does not tell you.

Bernard, Founder of ProteinDeals

Bernard, Founder of ProteinDeals

Published 5 October 20264 min read
Are Black Friday Protein Deals Really Cheaper? What the Evidence Shows

Quick answer

Sometimes, but the badge is a poor guide and the day matters less than you think. Which? found only 2% of tracked Black Friday deals were at their lowest on the day, though it studied tech and home goods, not protein. In past protein sales, two offers at 51% and 53% off cost £12.70 and £26.59 a kilo, and in 2023 Bulk's 1kg bag was cheaper on Cyber Monday than on Black Friday. Compare your usual checkout total.

01

98%: the number to keep in your head

In 2023, Which? published a finding that deserves a place on every Black Friday banner. It tracked 208 discounted products from Black Friday 2022 at eight retailers, including Amazon, Argos and Boots. 98% were the same price or cheaper at some point in the six months before or after. Only five were at their lowest price on the day itself.

There is a catch, and it matters here: the study covered tech, home and personal care, not protein powder. Nobody has published an equivalent study for supplements. So the honest answer to this article's question is that nobody knows how often protein is cheapest on Black Friday. What we can do is look at the protein offers that were documented, and see what their discount badges actually told shoppers.

208 Black Friday deals, and the 5 that were cheapest on the day

Which? tracked prices for six months either side of Black Friday 2022 at eight UK retailers. Tech, home and personal care products; no protein powder.

Each square is one discounted product

  • 5 were at their lowest price on Black Friday
  • 203 were the same price or cheaper at another time
View the data as a table
FindingProductsShare
Cheapest on Black Friday itself52%
Same price or cheaper at another time20398%
Total tracked208100%

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02

The badge lottery

Across 27 past UK protein offers with both a known pack size and an advertised discount, from 2021 to 2025, badges ranged from 15% to 69% and averaged 54%. The price per kilo ranged from £11.77 to £26.59.

There is a pattern, but a loose one. Deeper badges tended to come with cheaper powder, yet similar badges came with very different prices per kilo. The badge tells you how far the price fell from the retailer's own reference figure, not where that figure started.

Bigger badges, only loosely cheaper powder

Each dot is a past UK offer with a known pack size, 2021 to 2025. The trend slopes gently down, but at the same discount the price per kilo varied widely.

  • The pair compared in the text
  • Other offers

Price per kilo of powder, before delivery

Advertised discount

  • Bulk 5kg · 51% off · 2021 · £12.70/kg
  • Myprotein 1kg · 53% off · 2022 · £26.59/kg
  • Bulk via Amazon · 15% off · 2025 · £18.69/kg

Whey and vegan protein only. Discounts are measured against each retailer's stated reference price, not a verified usual selling price; where a source gave only a percentage, that figure is used. Bulk's 5kg sack in 2024 (£16.00/kg) is not plotted because no discount was stated.

View the data as a table
OfferAdvertised discountPrice per kilo
The Protein Works Vegan Protein 500g, Black Friday 202569%£14.78
The Protein Works Whey Protein 80 1kg, Cyber Monday 202367%£13.99
The Protein Works Vegan Protein 500g, 202567%£15.98
The Protein Works Vegan Protein 2kg, Black Friday 202566%£11.95
The Protein Works Vegan Protein 1kg, Black Friday 202565%£13.89
The Protein Works Vegan Protein 4kg, Black Friday 202564%£11.77
The Protein Works Whey Protein 80 500g, BF week 202362%£18.98
Bulk Pure Whey 1kg, Cyber Monday 202362%£14.99
Myprotein Impact Whey 250g, Black Friday 202361%£18.84
Myprotein Impact Whey 1kg, Cyber Monday 202361%£15.78
Bulk Pure Whey 5kg, Black Friday 202359%£14.00
Bulk Pure Whey 2.5kg, Black Friday 202358%£15.20
Bulk Pure Whey 1kg, BF weekend 202157%£12.99
Bulk Pure Whey 1kg, Black Friday 202357%£16.65
Myprotein Impact Whey 1kg, BF week 202355%£17.82
Bulk Pure Whey 500g, Black Friday 202355%£19.78
Bulk Pure Whey 2.5kg, BF weekend 202154%£12.80
Myprotein Impact Whey 1kg, 2022, code BLACK53%£26.59
Bulk Pure Whey 5kg, BF weekend 202151%£12.70
Bulk Pure Whey Vanilla 1kg, BF week 2023, Amazon51%£18.99
Myprotein Vegan Protein Blend 1kg, 2022, code BLACK50%£15.00
The Protein Works Whey Protein 80 500g, BF weekend 202250%£25.00
The Protein Works Whey Protein 80 1kg, BF weekend 202250%£21.50
Bulk Pure Whey 500g, BF weekend 202148%£17.58
The Protein Works Whey Protein 80 2kg, BF weekend 202245%£22.00
Myprotein Impact Whey 500g, 202517%£24.98
Bulk Pure Whey 1kg, 2025, Amazon15%£18.69
03

When the badge grew, so did the bill

Bulk's own archived pages show how a badge can mislead from one year to the next. Between Black Friday 2021 and 2023, its stated 'was' prices for Pure Whey rose, so even with the same or bigger badges, the sale prices went up.

In other words, the percentage held steady or grew while the bill went up. A badge compared with last year's badge tells you nothing; a price per kilo compared with last year's price per kilo does.

Same bags, two Black Fridays

Bulk Pure Whey on Bulk's own site. Grey is the stated was price, green the sale price, before delivery.

Reported reference pricePublished offer price
1kg · Black Friday weekend 2021£29.99£12.99

57% off · £12.99/kg

Bulk page · 27 Nov 2021 ↗
1kg · Black Friday 2023£38.99£16.65

57% off · £16.65/kg

Bulk page · 24 Nov 2023 ↗
5kg · Black Friday weekend 2021£129.99£63.49

51% off · £12.70/kg

Bulk page · 27 Nov 2021 ↗
5kg · Black Friday 2023£169.99£69.99

59% off · £14.00/kg

Bulk page · 24 Nov 2023 ↗

Reference prices are those reported by the source, not verified ordinary selling prices. These historical offers are not confirmed 2026 deals.

04

Black Friday was not even the cheapest day

Which? found that only 2% of its deals were cheapest on Black Friday itself, and the protein record points the same way. In 2023, some of the same bags got cheaper again by Cyber Monday.

If you buy on the first day of the sale, keep the tab open: the same bag can get cheaper before the week is out.

Prices moved within the sale week

The same 1kg bags at different points in Black Friday week 2023, before delivery.

Reported reference pricePublished offer price
Bulk Pure Whey 1kg · Black Friday£38.99£16.65

Bulk's own page

Bulk page · 24 Nov 2023 ↗
Bulk Pure Whey 1kg · Cyber Monday£38.99£14.99

£1.66 less than on Black Friday

Coach · 27 Nov 2023 ↗
Myprotein Impact Whey 1kg · week of Black Friday£39.99£17.82

Roundup first published 21 Nov 2023

Men’s Fitness · 2023 ↗
Myprotein Impact Whey 1kg · Cyber Monday£39.99£15.78

£2.04 less than the earlier listing

Coach · 27 Nov 2023 ↗

Reference prices are those reported by the source, not verified ordinary selling prices. These historical offers are not confirmed 2026 deals.

Cheapest Whey Protein
Diet Whey Protein Powder

Diet Whey Protein Powder

Pure Source Nutrition · 1kg

381Kcalper 100g
76gProteinper 100g
10.1gCarbsper 100g
2.8gFatper 100g

Pros

  • 55.5% cheaper per 25g protein than the median of 65 other Whey Protein product families in this comparison
£15.99£0.526/25g protein
Compare all whey protein
05

The price you cannot check

Some offers cannot be judged at all. Several past listings, mostly for isolate, clear whey and Whey Protein 360, gave a price and a discount but no pack size.

Without the weight, there is no way to tell whether the price is good. When an offer does not show it, open the product page before you open your wallet.

06

Where a real saving quietly disappears

Even a genuine discount can be undone at checkout. Bulk's November 2025 campaign added an extra 10% off and a gift, but only on orders of £55 or more. Planning to spend £40? Topping up to qualify means paying £49.50, which is £9.50 more than you meant to spend, on products you had not planned to buy.

Delivery charges, subscriptions that renew at a different price, and vouchers that only work on a later order belong in the same sum. The Bulk guide works through each of them.

07

What 2026 could look like

If this year's badges match the past average of 54%, a 1kg bag of Myprotein Impact Whey at today's £34.49 would come to about £15.87. Because past badges were measured from 'was' prices, the real saving against today's price is likely to be smaller.

Each retailer guide runs this for its own average: Myprotein, The Protein Works and Bulk.

08

Five ways to pay less than the sale price

The Black Friday price is not always the lowest you can pay. Before checking out, run through these five.

  1. 1

    Voucher codes. A second code can beat the headline sale. Try each one you find and compare the final totals, not the percentages.

  2. 2

    Discounts for who you are. Myprotein, Bulk and The Protein Works all list extra discounts for students and Blue Light Card members, typically 5% to 20% off. Some stack with sale prices and some do not; the Myprotein, Bulk and Protein Works guides have the details.

  3. 3

    A different retailer. The cheapest place for a product is not always the brand's own site. Our protein comparison and product pages show Amazon and eBay listings where we track them.

  4. 4

    Clearance and short-dated stock. Clearance and short-dated stock can undercut a Black Friday code. Our sales page tracks clearance deals; check the best-before date before you buy.

  5. 5

    Subscriptions. A lower subscription price is worth checking alongside a one-off code. Compare the delivered total for the same pack, then look at what repeat orders cost. Set the interval to match how quickly you finish it; another pack arriving while the first is still half full ties up money instead of saving it.

09

Run your own Which? test

You do not need six months of price tracking to answer this question for yourself. You need one honest comparison, made with the same product on both sides.

For what to expect and when offers tend to appear, see the Black Friday protein guide. For what your powder costs per 25g of protein today, use the protein comparison table.

A one-product version of the Which? study

01

Record

Now

Your usual product, flavour and size. Note the checkout total with delivery and any code you normally use.

02

Rebuild

Sale week

Put the identical order in the basket during the sale, with its code and delivery.

03

Decide

Lower total?

Buy if it beats your record and you need the stock. Ignore the badge.

References

Sources and further reading

  1. 01
    The Protein Works Vegan Protein page, archived 27 November 2025 (Wayback Machine)

    Regular and sale prices for 500g, 1kg, 2kg and 4kg during the Black Friday sale, 26 November to 1 December 2025.

  2. 02
    The Protein Works Whey Protein 80 page, archived 27 November 2022 (Wayback Machine)

    Regular and sale prices for 500g, 1kg and 2kg during the Black Friday Weekender.

  3. 03
  4. 04
    Bulk Pure Whey product page, archived 27 November 2021 (Wayback Machine)

    Regular and sale prices for 500g, 1kg, 2.5kg and 5kg over Black Friday weekend.

  5. 05
    Coach — Cyber Monday protein deals, updated 27 November 2023 (Wayback Machine)

    UK listings with pack sizes and was prices for Myprotein, Bulk and The Protein Works.

  6. 06
    Coach — Myprotein Black Friday offers, updated 22 November 2022

    Impact Whey 1kg £26.59 from £55.99, Vegan Protein Blend 1kg £15.00 from £29.99 and 12 Impact bars £13.88 from £24.99, with code BLACK.

  7. 07
    Which? — Only 2% of discounted products are cheapest on Black Friday, 24 November 2023

    208 Black Friday 2022 deals at Amazon, AO, Argos, Boots, Currys, John Lewis, Richer Sounds and Very, tracked six months either side. Tech, home and personal care only; no protein products.

  8. 08
    Men’s Fitness — 27 November 2025

    Advertised reductions for Impact Whey 500g (17%), Vegan Protein 500g (67%) and Bulk Pure Whey 1kg on Amazon (15%).

  9. 09
    Men's Fitness — Black Friday roundup, published 21 November and updated 1 December 2023

    UK listings identify pack sizes and reference prices; Bulk listing links to Amazon.

  10. 10
    The Standard — The Protein Works Cyber Monday offers, 2 December 2024

    Reported product reductions and an extra-code offer; most pack sizes and flavours unspecified.

  11. 11
    Stack3d — Bulk Friday product offers, 24 November 2024

    Direct-site sale coverage: Pure Whey 5kg £79.99, creatine 1kg £27.89 and Dope pre-workout £19.99.

  12. 12
  13. 13
    Amazon UK — Subscribe & Save

    Discounted recurring deliveries on eligible products. Subscription availability must be checked for the exact listing. Checked 6 October 2026.

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