Index
Guides
Read in order if you are new to peptide documentation; each guide stands alone if you are not. Word counts and review dates are shown so you know how much time each one takes and how current it is.
- No. 01
How to Read and Verify a Peptide Certificate of Analysis
A line-by-line method for reading a peptide COA, the five checks that tell you whether the document belongs to the vial in your hand, and a worked example on a public lot record you can open yourself.
- No. 02
HPLC Purity vs MS Identity: What Each Test Proves
The two tests on almost every peptide certificate answer two different questions. This guide explains how each measurement is made, what it can rule out, what it cannot see, and how to read the pair together using real public lot records.
- No. 03
What Purity Should Research Peptides Have, and How Is It Tested?
Purity, content and identity are three different numbers. This guide explains where peptide impurities come from, what the common purity tiers mean, what published studies and public lot records actually show, and how each figure is measured.
- No. 04
How to Check Whether a Peptide Supplier Is Legitimate
A five-layer method for checking a peptide supplier before you pay: the legal entity, the domain, the documents, the regulatory claims and the conduct, plus a section on recognizing clone sites built from a real case in which a manufacturer’s lot records and photographs were copied wholesale.
- No. 05
GMP Claims: How to Verify a Certificate and When Not to Trust It
GMP is the most-quoted and least-checked claim in peptide supply. This guide explains who actually issues GMP certificates, where each kind can be looked up, how to read a certificate image, why a genuine certificate may not cover the vial you buy, and when to treat the claim as marketing.
- No. 06
Third-Party Peptide Testing and How to Read a Janoshik Report
How to choose a laboratory, keep the chain of custody intact, specify the test panel and verify the result, with a field-by-field reading of a real Janoshik Analytical report, including what its batch field got wrong and what that teaches about submitting samples.
- No. 07
US vs China Peptide Suppliers: What Changes in Verification
Not which is better, but what you can verify and where. How entity records, regulatory footprints, document conventions, laboratory ecosystems and remedies differ between US-based and China-based peptide suppliers, and why the reseller-versus-manufacturer question usually matters more than the flag.
- No. 08
Lyophilized vs Pre-Mixed Peptide Vials: What Changes
A lyophilized vial and a vial of peptide already in solution are different objects with different documents, different stability behavior and different verification questions. This guide explains what each format is, which lot the certificate describes, what to ask about solvent and concentration, and how to test each.
- No. 09
Manufacturer vs Stockist vs Reseller: Due Diligence by Role
The three roles in peptide supply are defined by what each can produce on request. This guide explains how to tell which one you are dealing with, what each role can and cannot document, how the certificate chain lengthens with each intermediary, and how to adjust lot traceability, testing and remedies accordingly.
- No. 10
What to Compare When Evaluating Peptide Vendors
Published vendor lists are snapshots with hidden criteria. This guide gives a scorecard of measurable, source-verifiable criteria across identity, documentation, independent evidence, regulatory claims, consistency and commercial terms, with weighting by use and a worked template on three hypothetical supplier profiles.