CoA Trust Index
How 17 UK peptide retailers handle Certificates of Analysis
Oliver Mackman · Editorial director · Best Business Loans Ltd (16833937)
Last updated 2026-05-20
The PeptideClear CoA Trust Index is the UK reference for how every research-peptide retailer handles Certificates of Analysis. It scores 17 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 is dissolved auto-tier red regardless of score. The 17-retailer scoring resolves to 3 green (CoA: strong), 7 amber (CoA: partial), and 7 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 2026-05-20. Auto-refreshed monthly.
3
CoA: strong
Per-batch publishing, third-party lab named, no email gate or open subdomain.
7
CoA: partial
Some signal (per-batch claim or gated CoA), but gaps on transparency, lab naming, or accessibility.
7
CoA: weak / closed
No accessible CoA, anti-third-party-testing stance, or dissolved corporate entity still trading.
Full comparison
Scroll the table horizontally to see all columns.
| 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 |
| Peptide Lab UK | CoA: partial | Not named | Yes | No | 2026 | , | |
| Peptide Labs UK | CoA: partial | Third-party HPLC and mass-spec (lab unnamed) | Yes | No | 2023 | , | |
| Vitality Peptides | CoA: partial | Accredited (unnamed) | Yes | No | 2025 | , | |
| my-peptides | CoA: weak / closed | HPLC verified (in-house claim) | Yes | No | , | , | |
| Direct Peptides UK ⚠ US parent, no UK Companies House registration | CoA: weak / closed | unverified | Third-party GMP-inspected ISO9001 facility (unnamed) | ? | No | 2017 | , |
| 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.
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 the only objective signal you can verify 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.