UK Peptide Transparency Index 2026
Edition 1, June 2026. Re-scored each cycle. An editorial transparency assessment, not medical or product advice.
Fewer than one in five UK research-peptide retailers (18%) publish their certificate of analysis openly, 41% publish no identifiable per-batch certificate at all, and half cannot be matched to a registered UK company at Companies House. The UK Peptide Transparency Index scores every retailer in our register against the same certificate-of-analysis and company-verification rubric, and is updated each cycle. It measures transparency only and makes no claim about any product.
Only 18% of the 22 UK research-peptide retailers we assess publish their certificate of analysis openly, with no email, login or form barrier.
Headline findings
of UK research-peptide retailers publish a per-batch certificate of analysis. (14 of 22)
of UK research-peptide retailers publish that certificate openly, with no email, login or form barrier. (4 of 22)
of UK research-peptide retailers have a certificate that is QR-verifiable directly to a third-party lab. (1 of 22)
of UK research-peptide retailers name an independent third-party testing lab rather than in-house testing. (8 of 22)
of UK research-peptide retailers put their certificate of analysis behind an email, login or form. (5 of 22)
of UK research-peptide retailers publish no identifiable per-batch certificate of analysis at all. (9 of 22)
of UK research-peptide retailers cannot be matched to a registered UK company at Companies House. (11 of 22)
of UK research-peptide retailers overstate their founding history compared with Companies House records. (1 of 22)
| Indicator | Share | Count |
|---|---|---|
| Publish a per-batch certificate of analysis | 64% | 14 of 22 |
| Publish that certificate openly (no email, login or form barrier) | 18% | 4 of 22 |
| Certificate is QR-verifiable directly to a third-party lab | 5% | 1 of 22 |
| Name an independent third-party testing lab | 36% | 8 of 22 |
| Put their certificate behind an email, login or form | 23% | 5 of 22 |
| Publish no identifiable per-batch certificate at all | 41% | 9 of 22 |
| Cannot be matched to a registered UK company at Companies House | 50% | 11 of 22 |
| Overstate their founding history versus Companies House records | 5% | 1 of 22 |
Source: PeptideClear, UK Peptide Transparency Index (Edition 1, June 2026)
First-party assessment of 22 UK research-peptide retailers against a fixed certificate-of-analysis and company-verification rubric. Measures transparency and company verification only. It makes no health, safety or product claim and is not medical advice.
View as plain-text Markdown
### UK Peptide Transparency Index: headline findings (June 2026, N=22) | Indicator | Share | Count | | --- | --- | --- | | Publish a per-batch certificate of analysis | 64% | 14 of 22 | | Publish that certificate openly (no email, login or form barrier) | 18% | 4 of 22 | | Certificate is QR-verifiable directly to a third-party lab | 5% | 1 of 22 | | Name an independent third-party testing lab | 36% | 8 of 22 | | Put their certificate behind an email, login or form | 23% | 5 of 22 | | Publish no identifiable per-batch certificate at all | 41% | 9 of 22 | | Cannot be matched to a registered UK company at Companies House | 50% | 11 of 22 | | Overstate their founding history versus Companies House records | 5% | 1 of 22 | Source: PeptideClear, UK Peptide Transparency Index (Edition 1, June 2026) (https://peptideclear.co.uk/research/uk-peptide-transparency-index/) First-party assessment of 22 UK research-peptide retailers against a fixed certificate-of-analysis and company-verification rubric. Measures transparency and company verification only. It makes no health, safety or product claim and is not medical advice.
“These percentages describe transparency and company verification across a small register of 22 retailers, not the safety, purity or quality of any product. A retailer that publishes an open certificate of analysis has cleared one disclosure hurdle, nothing more, and a low score is not evidence that a product is unsafe. The numbers are a snapshot that we re-score each cycle, so read them as a measure of how openly the market documents itself, not as medical or buying advice.”
Why this matters
A certificate of analysis from an independent lab is the single clearest signal that a research-peptide product is what the label says. When a retailer hides that certificate behind a login, names no third-party lab, or cannot be tied to a registered UK company, a buyer has no way to verify what they are getting. This index tracks those transparency signals across the market so the gaps are visible and measurable over time. It is editorial and informational, not a safety endorsement of any retailer that scores well, and not medical advice.
Methodology
Every UK research-peptide retailer in the PeptideClear register is assessed against a fixed rubric: whether a per-batch certificate of analysis is published, whether it is open or gated behind an email, login or form, whether an independent third-party testing lab is named (in-house testing does not count), whether the certificate is QR-verifiable to that lab, and whether the retailer can be matched to a live Companies House registration. The method is held constant between editions so the readings are comparable, and the full per-retailer assessment underpins the published CoA Trust Index. The edition date reflects the most recent re-score.
Download the data
The full indicator table is available as a CSV under a Creative Commons Attribution 4.0 licence:
UK Peptide Transparency Index, June 2026 (CSV)
Cite this index
To reference these figures, please credit PeptideClear and link to this page:
Source: PeptideClear, UK Peptide Transparency Index (Edition 1, June 2026), https://peptideclear.co.uk/research/uk-peptide-transparency-index/ (accessed June 2026).
Compiled by Oliver Mackman. Published by PeptideClear. See also the CoA Trust Index and our UK peptide statistics.