For Research Purposes Only · Not For Human Consumption
UK Peptides is a Manchester-based research supplier. Every lot we dispatch is independently tested to ≥98% purity by HPLC-UV and confirmed by ESI mass spectrometry at Janoshik Analytical or Aspen Bioanalytics. The signed certificate is linked directly from the product page — never on request, never behind a form.
≥98%
HPLC-UV purity floor verified per lot
100%
Third-party Certificates of Analysis
Same-day
Dispatch from Manchester before 3pm GMT
UK Ltd
Registered British research supplier
The UK research peptide market is full of suppliers publishing certificates produced on their own template, signed by no one, dated suspiciously consistently across lots. For an experiment to be meaningful, the analytical data behind a vial must be verifiable — by an external laboratory, by a named analyst, against a method you can read. That is what an independent Certificate of Analysis from Janoshik or Aspen provides, and what every UK Peptides product ships with.
Read more about our independent testing process on the Quality & Methodology page or browse all signed lab reports.
Case study · independent verification
Dr. P. Hargreaves, a senior researcher at a UK private clinical lab, ordered a sample of Retatrutide 10mg from UK Peptides in October 2025 and ran the material through their in-house HPLC against an external reference standard. The independent purity figure came back at 99.2%, against the 98.7% printed on the Janoshik certificate supplied with the lot — within standard analytical tolerance. Identity by ESI-MS matched the theoretical 4,810.5 Da mass within 0.02%.
"Independent verification on the lot confirmed the stated purity within margin of error. Documentation, packaging and cold chain were all faultless. Switched the whole group over from a US supplier last quarter."
— Dr. P. Hargreaves, October 2025
View Retatrutide 10mg with CoA →If a supplier cannot answer all seven of the following questions with a verifiable yes, the material in their vials is not laboratory-grade — regardless of price, packaging, or how convincing their website looks. Use this list whenever you are comparing UK peptide sources.
A signed third-party CoA on every lot
Not an in-house PDF, not a screenshot, not 'on request'. A signed certificate from a named external laboratory (Janoshik, Aspen, Anresco) linked directly on the product page before you buy.
Matching lot number on vial, CoA and invoice
If the lot on the vial label does not appear on the CoA you were sent and on your dispatch note, the certificate is not for that material.
≥98% HPLC-UV purity, with method published
The certificate must show the actual HPLC chromatogram, the column type (typically C18), the mobile phase (typically 0.1% TFA / acetonitrile), and the gradient used.
ESI mass spectrometry identity confirmation
Purity proves how clean the material is. Mass spec proves what the material actually is. A CoA without MS is incomplete.
Cold chain in transit
Lyophilised peptides ship in insulated mailers with ice packs. A peptide that arrives warm to the touch in summer is not being handled correctly.
A real UK business address and contact
A registered UK Ltd, a real Manchester or London despatch address, a monitored email that replies within working hours. No anonymous forms.
Tracked Royal Mail delivery with same-day cut-off
Same-day dispatch before 3pm GMT and Royal Mail Tracked 24 is the standard a working UK lab can plan around. Slower than that and the supplier isn't equipped for research customers.
Every product below is in stock, dispatched from Manchester, and ships with a signed third-party Certificate of Analysis. Prices are in GBP and include free Royal Mail Tracked 24 delivery to UK mainland addresses.
Metabolic Research
Retatrutide 10mg
Triple-receptor GLP-1, GIP and glucagon agonist. Retatrutide is the most advanced metabolic research peptide currently available, supplied as lyophilised powder with a batch-matched Certificate of Analysis.
Metabolic Research
Retatrutide 20mg
Higher-dose triple-receptor GLP-1, GIP and glucagon agonist for extended research protocols. Lyophilised powder with batch-matched Certificate of Analysis.
Skin Health / Anti-Ageing
GHK-Cu 100mg
Copper peptide tripeptide-1. Extensively researched for collagen synthesis, wound repair, and skin rejuvenation.
Recovery / Healing
BPC-157 5mg
Body Protection Compound-157. One of the most widely researched peptides for tissue repair, gut health, and joint recovery.
Growth Hormone / Recovery
CJC-1295 + Ipamorelin 5+5mg
The gold-standard GHRH + GHRP combination blend. Research-grade dual peptide for GH pulse stimulation studies.
Accessories / Reconstitution
Bacteriostatic Water 10ml
0.9% benzyl alcohol bacteriostatic water for peptide reconstitution. Pharmaceutical-grade, sterile-filtered, 10ml vial.
Skin / Hormonal Research
MT-2 10mg
Melanotan II — synthetic melanocortin receptor agonist. Extensively studied for melanogenesis and libido research.
Recovery / Healing
TB-500 5mg
Thymosin Beta-4 fragment analogue. Widely researched for systemic tissue repair, inflammation, and cardiovascular recovery.
Test / Internal
Test Payment Product 1 unit
Temporary 1p product for checkout and webhook flow validation. Do not purchase — for testing only.
1. Verify the CoA
Open any product page and download the signed third-party Certificate of Analysis before you buy.
2. Checkout
Pay by UK bank transfer (Fena, instant) or by debit / credit card. Invoiced from a registered UK Ltd.
3. Same-day dispatch
Orders placed before 3pm GMT Mon–Fri ship that working day via Royal Mail Tracked 24.
4. Cold-chain delivery
Vials arrive in an insulated mailer with ice packs, plain outer packaging, no compound name visible.
Yes. Research peptides are legal to purchase in the United Kingdom for in-vitro laboratory research. They are not scheduled under the Misuse of Drugs Act 1971 or the Psychoactive Substances Act 2016, and they are not licensed medicines under MHRA regulation. They are not approved for human or veterinary use. Buyers must be 18 or over and ordering for legitimate research purposes.
A third-party CoA is a signed laboratory report produced by an independent analytical laboratory — not by the supplier — confirming the peptide's purity by HPLC-UV and its identity by mass spectrometry. UK Peptides uses Janoshik Analytical and Aspen Bioanalytics. Every product page links the signed CoA for the lot you receive.
First-party (in-house) certificates can be edited freely. An independent CoA cannot — it is signed by the analyst, dated, and traceable to a named laboratory. For a research lab placing material into an experiment, third-party verification is the only way to know what is actually in the vial before it touches the column.
Orders placed before 3pm GMT Monday to Friday are dispatched the same working day from Manchester via Royal Mail Tracked 24. Most UK mainland postcodes receive delivery the next working day in an insulated mailer with ice packs to preserve cold chain.
No special licence is required to purchase unscheduled research peptides such as BPC-157, TB-500, GHK-Cu, Retatrutide or CJC-1295 + Ipamorelin for in-vitro laboratory research. You must be 18 or over and the material must remain in a research setting.
UK Peptides accepts UK bank transfer via Fena (instant settlement), and major debit and credit cards through our checkout. All orders are invoiced from a registered UK business.
Yes. Outer packaging is plain — no branding, no compound name visible — and addressed from a neutral Manchester despatch address. The CoA is sent electronically rather than enclosed in the parcel.
Ready to order?
Browse the full catalogue with live stock and signed CoAs, or read the methodology behind every UK Peptides lot.