CoA Trust Index
How 22 UK peptide retailers handle Certificates of Analysis
Oliver Mackman · Editorial director · Best Business Loans Ltd (16833937)
Last updated 2026-07-03
The PeptideClear CoA Trust Index is the UK reference for how every research-peptide retailer handles Certificates of Analysis. It scores 22 UK retailers across six observable signals: per-batch CoA publishing, gating method (open, email, login, image, or absent), third-party laboratory partner naming, QR-verifiable batch lookup, dedicated CoA URL, and public stance on third-party testing. Retailers whose UK Companies House entity showed as dissolved at the time of our review are tiered red regardless of score (status checked monthly; readers should verify current registration directly at Companies House). The 22-retailer scoring resolves to 3 green (CoA: strong), 9 amber (CoA: partial), and 10 red (CoA: weak or closed). Editorial commentary based on publicly available information at the time of review. Compiled by Oliver Mackman, editorial director, PeptideClear. Last reviewed 2026-07-03. Auto-refreshed monthly.
3
CoA: strong
Per-batch publishing, third-party lab named, no email gate or open subdomain.
9
CoA: partial
Some signal (per-batch claim or gated CoA), but gaps on transparency, lab naming, or accessibility.
10
CoA: weak / closed
No accessible CoA, no publicly identifiable third-party testing, or a registered entity that showed as dissolved at the time of review.
Full comparison
Scroll the table horizontally
| Retailer | CoA tier | Access | Lab partner | Per-batch | QR verifiable | Founded | Companies House |
|---|---|---|---|---|---|---|---|
| XL Peptides | CoA: strong | open | Janoshik (third-party, QR-verifiable) | Yes | Yes | 2024 | 15464334 |
| Pure Peptides UK | CoA: strong | open | ISO9001-certified UK partner lab | Yes | No | 2014 | 10512948 |
| Imperial Peptides | CoA: strong | open | Third-party HPLC | Yes | No | 2022 | , |
| Peptides UK ⚠ Registered office is a known mail-forwarding address | CoA: partial | form | cGMP and ISO9001 facility (unnamed) | Yes | No | 2012 | , |
| Tide Labs | CoA: partial | open | UKAS-verified HPLC (claimed sole-in-UK) | Yes | No | 2023 | , |
| Dr Peptides | CoA: partial | image | Third-party (lab unnamed, photographed in listings) | Yes | No | 2025 | 16656576 |
| BioPlex Peptides ⚠ Site claims founding year materially older than Companies House incorporation | CoA: partial | image | COAs claimed (lab unnamed) | Yes | No | 2025 | 16653527 |
| Bluewell Peptides | CoA: partial | With order | Not named | Yes | No | 2022 | , |
| Chroma Peptides | CoA: partial | With order | Not named | Yes | No | , | , |
| OP Labs | CoA: partial | With order | Not named | Yes | No | 2023 | 15139756 |
| Peptide Labs UK | CoA: partial | Third-party HPLC and mass-spec (lab unnamed) | Yes | No | 2023 | , | |
| Thoroughbred Labs | CoA: partial | With order | Not named | Yes | No | 2022 | 14990140 |
| CK Peptides | CoA: weak / closed | On request | Janoshik | ? | No | , | , |
| my-peptides | CoA: weak / closed | HPLC verified (in-house claim) | Yes | No | , | , | |
| Anglo Peptides | CoA: weak / closed | On request | Not named | ? | No | 2025 | 16423217 |
| Direct Peptides UK ⚠ US parent, no UK Companies House registration | CoA: weak / closed | unverified | Third-party GMP-inspected ISO9001 facility (unnamed) | ? | No | 2017 | , |
| Maxx Labs | CoA: weak / closed | On request | Not named | ? | No | 2025 | 16454375 |
| UK Peptides | CoA: weak / closed | manifesto-against | In-house LCMS, HPLC (commissioning 2026 to 2027) | Yes | No | 2012 | 08033431 |
| BIOLAB Shop | CoA: weak / closed | unverified | Independent certified research centres claimed (unnamed) | ? | No | 2025 | 16994764 |
| Direct Sarms | CoA: weak / closed | unverified | Not named | ? | No | , | , |
| Peptagenix ⚠ Registered office is a known mail-forwarding address | CoA: weak / closed | unverified | Accredited laboratories claimed (unnamed) | ? | No | 2024 | 16041763 |
| Research Peptides UK ⚠ Companies House entity dissolved, site still trading | CoA: weak / closed | none | Not named | ? | No | 2018 | , |
How we score CoA practice
We score each UK research peptide retailer on six observable signals. Score thresholds set the tier (green ≥ 5, amber 2 to 4, red below 2). Retailers whose Companies House entity is dissolved are auto-tiered red regardless of score.
Positive signals
- · +2 Per-batch CoA published (not just one-off)
- · +2 Open access (no email, login, or form gate)
- · +2 QR-verifiable directly to a named third-party lab
- · +1 Named third-party lab partner
- · +1 Dedicated CoA URL or subdomain
Negative signals
- · -2 Publicly rejects third-party CoA testing
- · -1 CoA gated behind email request
- · -1 CoA practice undisclosed or unverified
- · Auto-red Trading entity dissolved at Companies House
Scores are editorial commentary based on publicly available information at the time of review. PeptideClear does not laboratory-test peptides or audit labs directly. Read our full methodology and how we are funded. CoA links go to the retailer's published documentation where it exists.
Named UK manufacturers we reference
Real UK peptide manufacturing happens under MHRA inspection at named facilities. The three we cite across PeptideClear editorial as the reference point for "named lab":
- · Almac Group (Craigavon, Northern Ireland): MHRA-inspected, 600+ pharma customers, named launches Agios Pyrukynd, Sanofi Tzield, PTC Upstaza.
- · Sterling Pharma Solutions (Cramlington, Northumberland): UK CDMO, 25+ years peptide synthesis, 40-amino-acid capability.
- · Biosynth Pepceuticals (Leicester): MHRA-approved API manufacturer, 8 cGMP labs, multi-kilogram commercial supply.
None sells to consumers. They are the contrast point for what real UK peptide manufacturing looks like. Read the full explainer.
Why this matters
Every UK research peptide retailer claims purity. A small minority publish per-batch Certificates of Analysis from a named third-party laboratory. That is one of the few objective signals a buyer can verify independently before buying.
This page exists because no UK retailer can honestly compare its own CoA practice against the rest of the segment. We do that here, in one place, updated monthly.
Research peptide encyclopaedia entries
CoA quality matters most when a compound has a substantial research literature. These are the compounds with the most-cited UK retailer stock and preclinical literature.
BPC-157
Most discussed research peptide. Animal data only. Encyclopedia entry.
TB-500
Thymosin beta-4 fragment. Preclinical connective tissue literature.
GHK-Cu
Copper-binding tripeptide. In-vitro and preclinical literature. Also in cosmetics.
Ipamorelin
Growth hormone secretagogue. Novo Nordisk Phase II, discontinued.
Sermorelin
GHRH analogue. Geref withdrawn US 2008. No UK marketing authorisation.
MOTS-c
Mitochondrial-derived peptide. Nature Communications 2020. Mouse data.
Machine-readable access
The data behind this index is published as a read-only Data API and MCP server for developers and AI agents: a JSON endpoint listing every seller with its CoA verification signals, plus an aggregate CoA snapshot. Factual vendor and verification data only, not medical advice and not a recommendation to use any substance. Released under CC BY 4.0.