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 the independent laboratory an accredited independent laboratory. Signed certificates are published in our lab reports library and linked from the product page; where a lot's certificate is not yet published, we send it against your order ID — never behind a form.
≥98%
HPLC-UV purity floor verified per lot
100%
Third-party Certificates of Analysis
Same-day
Dispatch from Manchester before 6pm GMT
Manchester
UK-based, UK-stocked, UK-dispatched
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 the testing laboratory 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 independent 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 for the lot you receive
Not an in-house PDF and not a screenshot: a signed certificate from a named external laboratory (an independent laboratory) carrying the same lot number as the vial. If it is not already published on the product page, ask for it by order ID 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 genuine UK despatch address, a named trading entity, and a monitored email that replies within working hours. No anonymous forms, no overseas drop-shipping.
Tracked Royal Mail delivery with same-day cut-off
Same-day dispatch before 6pm 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
Retatrutide peptide (LY3437943) — a synthetic 39-residue triple agonist at the GLP-1, GIP and glucagon receptors. Lyophilised powder, signed batch CoA on the page.
Metabolic Research
Retatrutide 20mg
The same retatrutide (LY3437943) as our 10mg vial — twice the payload from one lot, at a lower cost per milligram. Signed batch CoA on the page.
Metabolic Research
Retatrutide 30mg
Retatrutide 30mg UK — 30mg of LY3437943 from a single synthesis, so a long study runs start to finish without a lot change. Our lowest cost per milligram.
Skin Health / Anti-Ageing
GHK-Cu 100mg
GHK-Cu peptide (copper tripeptide-1), lyophilised. Studied for collagen synthesis, matrix remodelling and wound-repair signalling.
Recovery / Healing
BPC-157 5mg
BPC-157 peptide — a synthetic pentadecapeptide, lyophilised. Studied in models of tendon, ligament, gut-lining and vascular repair.
Growth Hormone / Recovery
CJC-1295 + Ipamorelin 5+5mg
CJC-1295 without DAC, co-lyophilised with Ipamorelin at 5mg of each. A short-acting GHRH analogue paired with a selective ghrelin-receptor agonist.
Accessories / Reconstitution
Bacteriostatic Water 3ml
Bacteriostatic water with 0.9% benzyl alcohol — the standard solvent for reconstituting lyophilised peptides. Sterile-filtered 3ml vial.
Skin / Hormonal Research
MT-2 10mg
Melanotan 2 (MT-2) — a synthetic melanocortin receptor agonist, lyophilised. Studied for melanogenesis and receptor signalling.
Recovery / Healing
TB-500 5mg
TB-500 peptide — a Thymosin Beta-4 fragment analogue. Researched for tissue repair, inflammation and cardiovascular recovery.
Nootropic / Cognitive Research
Semax 10mg
Semax peptide — a synthetic ACTH(4-10) analogue. Researched for BDNF expression, focus, memory and neuroprotection in preclinical models.
Mitochondrial / Metabolic Research
MOTS-C 10mg
MOTS-c peptide — 16 amino acids, encoded in the mitochondrial genome. Studied for AMPK activation, insulin sensitivity and metabolic homeostasis.
Longevity / Metabolic Research
NAD+ 500mg
Nicotinamide Adenine Dinucleotide. Central coenzyme in cellular energy metabolism, sirtuin activity and DNA repair research.
Nootropic / Anxiolytic Research
Selank 10mg
Selank peptide — the tuftsin-derived heptapeptide TKPRPGP, lyophilised. Preclinical work on GABA-A, enkephalinase and BDNF expression.
Skin / Anti-Ageing Blend
GLOW 70mg
Proprietary GHK-Cu + BPC-157 + TB-500 co-lyophilised skin & recovery research blend. Advanced collagen and repair pathway modelling.
Skin / Anti-Ageing Blend
KLOW 80mg
High-payload copper peptide + repair blend. KPV + GHK-Cu + BPC-157 + TB-500 co-lyophilised for advanced collagen and connective-tissue research.
Antioxidant / Skin Research
Glutathione 1500mg
Reduced L-Glutathione (GSH). Master intracellular antioxidant researched for oxidative stress, detoxification and skin brightening pathways.
Sleep / Neuropeptide Research
DSIP 5mg
Delta Sleep-Inducing Peptide. Nonapeptide studied for slow-wave sleep architecture, stress response and neuroendocrine modulation.
Growth Factor Research
IGF-1 LR3 1mg
An 83-residue recombinant IGF-1 analogue with reduced IGF-binding-protein affinity. Lyophilised cell-culture reagent for IGF-1R signalling work.
Anti-Inflammatory Research
KPV 10mg
C-terminal α-MSH tripeptide (Lys-Pro-Val). Researched for NF-κB suppression, gut inflammation and mast-cell modulation.
1. Verify the CoA
Open any product page and download the signed third-party Certificate of Analysis before you buy.
2. Checkout
Pay securely by UK bank transfer via Fena Open Banking — instant, no card details stored. A full invoice is issued for every order.
3. Same-day dispatch
Orders placed before 6pm 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 an accredited independent laboratory. 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 6pm 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 Open Banking, which settles instantly and means no card details are ever stored on our systems. A full itemised invoice is issued for every order.
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.