Research use only · Not for human consumption

Pre-filled research peptide pens · United Kingdom

Calibre:Quality,Uncompromised.

Premium, high-purity research peptides in precision-filled pens. Retatrutide, tirzepatide, BPC-157, GHK-Cu and more. Every batch independently tested, every report published.

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pens in stock
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purity target
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lab reports live
Retatrutide 20mgBest sellerRetatrutide 20mg · £135Batch report published
  1. 01

    Sealed until it reaches you

    Every Calibre pen arrives pre-filled and capped, labelled with the compound and total dose. No reconstitution, no transfer step in the lab.

  2. 02

    Glass cartridge, precision filled

    The multi-dose cartridge is filled with meticulous attention to detail, to a target purity of over 99%, and the dose dial is set to the dose printed on the pen.

  3. 03

    Tested before it ships

    Batches go to Janoshik Analytical for HPLC purity and mass-spectrometry identity testing. The reports are published with a verification link hosted by the lab.

    See the certificates
Purity target
Over 99% (HPLC)
Testing
Janoshik Analytical, reports published
Format
Pre-filled, labelled pens
Dispatch
UK based, tracked

Catalogue

32 pens across 9 research areas.

From incretin and metabolic research to tissue repair, mitochondria, the growth-hormone axis, neuroscience, tanning, muscle and longevity. Every pen held to the same purity target.

Browse all pens
  1. 01Weight Loss GLPRetatrutide, tirzepatide and eloralintide pens for metabolic and incretin research.7 pens
  2. 02Repair & Re-GrowBPC-157, TB4, GHK-Cu and KPV blends studied in tissue, skin and recovery research.7 pens
  3. 03Mitochondria PeptidesMOTS-c, NAD+, SS-31 and SLU-PP-332 for cellular energy and longevity research.4 pens
  4. 04GH SecretagoguesCJC-1295 (no DAC) with Ipamorelin, and Tesamorelin, for growth-hormone axis research.2 pens
  5. 05Neuro PeptidesSelank, Semax, Oxytocin and DSIP for neuroscience and sleep research.4 pens
  6. 06Fat LossAOD 9604 and Cagrilintide, studied for insulin response, appetite suppression and satiety.2 pens
  7. 07Tanning / Sexual FunctionMT2, MT2 Blackout nasal, PT 141 and Kisspeptin for tanning, sexual function and blood flow research.4 pens
  8. 08Muscle BuildingIGF-1 LR3, studied for muscle build, strength and body composition.1 pens
  9. 09LongevityEpitalon, studied for longevity, health and well-being.1 pens

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Featured pens

All 32 pens →
MOTS-c 40mg pre-filled research pen

Mitochondrial

MOTS-c 40mg

Mitochondrial-derived peptide, 40mg · COA published

  • MOTS-C40 mg

£120

View →
Scott, founder of Calibre Pens

Scott · Founder, Calibre Pens

The mind behind Calibre

"Calibre was built from the ground up on one simple belief: quality should never be compromised."

From day one I've worked to build a brand I could stand fully behind, every step of the way, from sourcing and quality control to precision manufacturing, packaging, customer service and delivery.

That hard work has grown into a brand trusted by thousands of satisfied customers. But success doesn't mean standing still. We're always refining, always improving.

Read the full story

Our commitment

Quality is the standard everything else is built on.

We source only what we believe to be the best products available, with a target standard of over 99% purity. With research-grade products, consistency is everything.

See the lab reports
  1. 01

    Sourcing

    Raw material from trusted UK and international suppliers, selected for purity first.

  2. 02

    Independent testing

    Batches analysed by Janoshik Analytical with HPLC and mass spectrometry. Reports published, not just claimed.

  3. 03

    Precision filling

    Every pen filled and labelled with its compound and total dose under meticulous quality control.

  4. 04

    Dispatch

    Packed and sent tracked within the UK, with clear communication from processing to arrival.

Certificates of analysis

Independently tested. Publicly verifiable.

Each report opens on the laboratory's own verification page, so the data is checked at the source, not on our say-so.

All certificates and how to read one →

Journal

Guides for UK researchers

All articles →

Questions

Straight answers.

On legality, purity, ordering and delivery. Anything else, message us.

WhatsApp 07885 706958All contact options
Yes. Research peptides are legal to buy, sell and possess in the UK as laboratory research materials. They are not licensed medicines and are supplied strictly for in-vitro research use, not for human consumption.
Each pen arrives already filled with the labelled compound and total dose, so there is no reconstitution or transfer step in the lab. The compound, dose and batch are printed on the pen.
Batches are sent for independent HPLC and mass-spectrometry analysis at Janoshik Analytical. Reports are published on our Certificates of Analysis page with a verification link to the lab.
Message us on WhatsApp, Telegram or email with the pen and dose you need. We confirm availability, the current batch COA and dispatch details directly.
Yes. Calibre is UK based and dispatches tracked across the United Kingdom. Weight-management pens include £5 UK postage in the listed price.
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