There are two different Myprotein codes on this page. New customers enter referrer code DOMI-R53 while registering for the £15 first-order offer. The separate Impact Week checkout code is MYPCHECKOUT, which gives an additional 10% off the eligible basket on top of the website’s current Impact Week pricing.

Live offerChecked 1 September 2026

Current Myprotein Impact Week offer

Phase 2

30% off almost everything, plus an extra 10% with MYPCHECKOUT

Available 3 September 2026 at 08:00 BST. Ends 10 September 2026 at 08:00 BST.

Checkout codeMYPCHECKOUT

Impact Week schedule

  1. Phase 1: 35% off almost everything, plus an extra 10% with MYPCHECKOUT27 August 2026 at 08:00 BST to 3 September 2026 at 08:00 BST
  2. Phase 2: 30% off almost everything, plus an extra 10% with MYPCHECKOUT3 September 2026 at 08:00 BST to 10 September 2026 at 08:00 BST
  3. Phase 3: 25% off almost everything, plus an extra 10% with MYPCHECKOUT10 September 2026 at 08:00 BST to 17 September 2026 at 09:00 BST

How to use the Myprotein codes

Register first, then check the live checkout offer

  1. Create a new Myprotein account.

    Find the referrer-code field during registration and enter DOMI-R53.

  2. Build an eligible first basket.

    The referral offer checked requires £45 of qualifying products. Do not add things you do not need simply to reach the threshold.

  3. Check the referral benefit.

    Look for £15 off and free UK delivery before continuing.

  4. Test MYPCHECKOUT at checkout.

    During Impact Week, enter MYPCHECKOUT in the promotional-code field and inspect the new total.

  5. Keep the cheapest valid basket.

    If the codes do not combine, compare each route and use the one that produces the lowest final price for the same products.

Impact Week bundles

The campaign also includes three dedicated bundles. Compare their final price and contents with buying the same products separately; a bundle is only useful when you want most of what it contains.

The bundle links are affiliate tracking links. London for Cheap may receive a commission without increasing your price.

Compare the real price, not the headline percentage

Myprotein prices and public codes change frequently. Compare the final price per serving or per 100g with another retailer and with the price you normally pay. A large percentage banner is not proof that the basket is good value.

Cashback may be available, but using an unlisted referral or promotional code can stop it tracking. Treat cashback as uncertain until it is confirmed, and prefer a guaranteed checkout reduction when it is worth more.

Pros

  • £15 can materially reduce a planned £45 first basket.
  • Free UK delivery is included on the eligible referral order.
  • The page changes phase automatically during Impact Week.
  • The full dated schedule remains visible.

Cons

  • Product exclusions apply.
  • The two codes are not guaranteed to combine.
  • Sale prices and product availability can change.
  • The £45 threshold can encourage unnecessary spending.

Myprotein discount questions

When do I enter DOMI-R53?
Enter DOMI-R53 in the referrer-code field while creating a new account. It is not the Impact Week checkout code.
What does MYPCHECKOUT do?
For the campaign checked on 1 September 2026, MYPCHECKOUT adds 10% off eligible items on top of the onsite Impact Week messaging. Check the basket because exclusions and code rules are controlled by Myprotein.
Will this page update when the sale percentage changes?
Yes. The live panel changes from 35% to 30% and then 25% at the supplied phase boundaries. After 17 September it displays an ended message instead of presenting an old promotion as current.
Can I combine the referral and checkout codes?
They are entered at different stages, but that does not guarantee Myprotein will combine every benefit. Compare the final basket with and without the checkout code.
Does every product qualify?
No. Myprotein publishes an exclusions list, and the checkout is the final authority for the exact products in your basket.

Sources and checks