What is the Liquilabs controversy mentioned under Particle Peptides?
In April 2026, questions surfaced about whether Liquilabs — the lab Particle cited for batch testing — was operating with sufficient independence from the vendor. Particle has not published a satisfactory rebuttal or moved testing to an unaffiliated lab. The Trust score reflects that unresolved status.
Why does in-house testing penalize a vendor's score so heavily?
In-house testing creates an obvious conflict of interest: the vendor controls both what is tested and what is published. Without an independent lab signing the CoA, there is no verifiable assurance the numbers match reality. This is why a 12-year track record alone (UK Peptides) cannot lift a score past the testing ceiling.
What is Janoshik testing, and is it actually independent?
Janoshik Analytical is a Czech lab widely used for third-party HPLC and mass spec, independent of the vendors it tests, with CoAs cross-checkable against its own database. It does not cover endotoxins or bioburden — so "Janoshik tested" means identity and purity, not sterility.
Why isn't [vendor X] on this list?
The top ten reflects vendors that cleared baseline eligibility — verifiable EU shipping, a public catalogue, and some form of testing documentation — and then scored highest on the composite. Vendors that failed eligibility, refused test orders, or could not be verified are excluded rather than ranked low. The full set of 21 is on the methodology page.
Can I send you my own CoA or order experience to factor into a vendor's score?
Yes — reader-submitted CoAs and order reports are reviewed and, where verifiable, factored into the next scoring cycle. They are weighted lower than our own test orders and named lab reports, but consistent reader signal does move scores over time. Use the contact form to send documentation, CoAs, or order notes.
