State of Peptide Vendors: September 2026
Our vendor ratings for September 2026, computed from the audit data behind every score: who was reviewed, how the scores moved, and what the certificates show. Research use only; nothing here is a health or dosing claim.
- First published
- 2
First published
- Score moves
- 0
Score moves
Summary
In September 2026: 2 vendors published for the first time.
Affiliate status never affects scores. Whether a vendor pays us a commission, declined to, or was never asked carries no weight in the formula. How we keep it that way.
Headline numbers
This month shows changes only. A month-end snapshot for September 2026 cannot be reconstructed reliably: 31 vendors listed today have no recorded score for that date, and the testing gate, lab scores and certificate counts are not recorded by date. Rather than estimate them, this page reports only what the data dates to September 2026.
Movers
Net change over the month for each vendor whose score moved by 0.05 points or more, from the dated audit history. Each name links to that vendor’s full score history. 0 moves of that size were logged (0 up, 0 down) across 0 audit entries.
Biggest rises
No rises of that size this month.
Biggest falls
No falls of that size this month.
Vendors added and removed
First published (2)
Removed (0)
No removal is recorded with a date in this month.
Laboratories and certificates
No dated laboratory determination is recorded for this month.
Our laboratory records carry the date of a finding that a laboratory’s independence was not established, but not the date a laboratory was first added or its earlier tier, so other additions and tier changes are not listed here. Every tier is on the laboratory directory.
Of the certificates on file today, 284 carry a laboratory test date in September 2026. Their median printed purity is 99.70%, 98% were confirmed at the issuing laboratory, and 38% include an endotoxin or sterility test.
Methodology
Every number on this page is generated from the same audit data as the rankings when the site is built, with no hand-entered figures. Scores, tiers and the testing gate follow our published methodology. Certificates on file are those from laboratories whose independence we could establish; a certificate counts as confirmed when its verification key was checked at the issuing laboratory. Purity is the figure printed on the certificate. Movers are net changes over the month from the dated history on score changes. A past month reports its dated changes; its month-end state is shown only where the data records it.
Cite this report
Peptide Source Review. "State of Peptide Vendors: September 2026." Published for September 2026. https://peptidesourcereview.com/state-of-peptide-vendors/2026-09
Data: https://peptidesourcereview.com/state-of-peptide-vendors/2026-09.csv, licensed CC BY 4.0. Please credit Peptide Source Review and link this page.