Sourcing
A grade means nothing if the vial is wrong.
Evidence quality and product quality are separate problems. This page is about the second one. We publish the criteria before we publish a single supplier, so the directory can be held to them.
Affiliate disclosure
DB Peptide earns a commission on some outbound supplier links. This never influences evidence grades, which are assigned from published literature alone. A supplier qualifies on the criteria below or it does not appear here. Listing is never sold, and no commission arrangement has ever changed a grade or a criterion.
The directory
Our supplier directory is being verified.
We only list suppliers that meet our vetting standard — third-party tested, COA available, and consistent in quality. We're confirming our first partners now. Check back soon.
Read our vetting criteria →What a supplier has to clear
All six, not a majority. A supplier that fails one is not listed, regardless of price, volume, reputation or commercial relationship.
Third-party testing
Purity and identity confirmed by an independent laboratory the supplier does not own or control. In-house testing alone does not qualify.
Certificate of analysis on request
A batch-specific COA must be available to any customer for any lot, not a single representative certificate reused across production runs.
Batch traceability
Every vial carries a lot number that resolves to a specific COA. Without traceability, a certificate proves nothing about what arrived.
Accurate labelling
Products are labelled for research use with correct compound names and quantities. Suppliers making therapeutic claims are excluded regardless of product quality.
Track record
At least twelve months of operating history with consistent independent test results and no pattern of unresolved fulfilment complaints.
Commercial independence
Listing is never sold. An affiliate relationship may exist after a supplier qualifies, but it can never be the reason one qualifies, and it never affects an evidence grade.
Reading a certificate of analysis
A COA is only useful if it corresponds to the vial in your hand. Four things to check on any certificate, from any supplier, including ours.
Does the lot number match the vial?
A certificate for a different batch tells you nothing about this one. If the lot on the vial is not on the certificate, the certificate is decorative.
Who ran the test?
The lab should be independent of the supplier. An in-house result from the same company selling the product is a self-assessment, not verification.
What method was used?
HPLC establishes purity. Mass spectrometry establishes identity. Purity without identity means you know the vial is 99% pure something.
What is the date?
Peptides degrade. A certificate from three years ago describes a batch that no longer exists in the state it was tested in.
Not medical advice
Compounds sold by any supplier listed here are research chemicals. A supplier clearing our vetting criteria says something about manufacturing and testing practice — nothing about whether any compound is safe or appropriate for any person. Consult a qualified clinician before starting any protocol.