NEW COAs JUST LANDED — 99% purity across every GLP-1 batch•Independently lab-tested by Analiza Bialek European testing•Third-party verified identity & purity — every batch, every time•The real deal. Traceable batch numbers. Downloadable certificates.•View the latest Certificates of Analysis →•NEW COAs JUST LANDED — 99% purity across every GLP-1 batch•Independently lab-tested by Analiza Bialek European testing•Third-party verified identity & purity — every batch, every time•The real deal. Traceable batch numbers. Downloadable certificates.•View the latest Certificates of Analysis →•
Peptides UK 4U0
Cold-shipped · Next-day UK

Peptide Pens UK

Pre-filled Quick Pens for Retatrutide, Semaglutide and Tirzepatide — reconstituted under sterile conditions in our UK facility and delivered ready-to-use the next working day. No mixing. No guesswork.

Shop peptides How Quick Pens work
Pre-filled peptide Quick Pen with vials and screw-on needles
Available pens

Choose your Quick Pen

Triple agonist GLP-1 / GIP / Glucagon

Retatrutide Pen

20mg / 40mg vial · 99%+ purity, HPLC tested

Read the pen guide
GLP-1 receptor agonist

Semaglutide Pen

30mg vial · 99%+ purity, HPLC tested

Read the pen guide
Dual GLP-1 / GIP agonist

Tirzepatide Pen

20mg / 40mg vial · 99%+ purity, HPLC tested

Read the pen guide

Sterile prep

Reconstituted in-house under strict sterile conditions with bacteriostatic water.

99%+ purity

Independently HPLC tested by Analiza Bialek European testing — batch-traceable.

Cold-shipped

Insulated cold packaging protects the peptide from door-to-door.

Next-day UK

Tracked Royal Mail 24 dispatch. Order before 2pm Mon–Fri for same-day.

How to order a peptide pen

  1. 1
    Pick your peptide
    Retatrutide, Semaglutide or Tirzepatide from the shop.
  2. 2
    Go to checkout
    Add your details and shipping.
  3. 3
    Add a Quick Pen
    Select the pen add-on — we include bac water & needles.
  4. 4
    We prepare & dispatch
    Reconstituted, refrigerated and cold-shipped next day.
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Peptide pen FAQs

Where can I buy a peptide pen in the UK?

Peptides UK 4U supplies pre-filled Quick Pens for Retatrutide, Semaglutide and Tirzepatide. Every pen is prepared in-house under sterile conditions and cold-shipped for next-day UK delivery.

What is a Quick Pen?

A Quick Pen is a standard dial-a-dose injection pen pre-loaded with reconstituted research peptide. It removes the need to mix a vial yourself — bacteriostatic water and screw-on needles are included.

Which peptides are available as a pen?

Retatrutide (20mg / 40mg), Semaglutide (30mg) and Tirzepatide (20mg / 40mg). All are independently HPLC tested at 99%+ purity by Analiza Bialek European testing.

How are the pens shipped?

Cold-shipped in insulated packaging via tracked next-day Royal Mail delivery from the UK. Order before 2pm Mon–Fri for same-day dispatch.

Please note, these products are for research purposes only and not for human use.

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