The Journal

Notes from Gatsby Peptides.

Essays on research peptides, analytical standards, and the quiet craft of laboratory practice.

All Articles

Third-Party Testing Explained

What Does Research Use Only Mean?

HPLC vs Mass Spectrometry: Verifying Peptide Purity

How to Choose a Research Peptide Supplier

A practical checklist for evaluating research peptide suppliers — third-party COAs, batch traceability, sourcing transparency, and red flags.

Research Compound Purity Explained

What HPLC purity actually measures, what it does not, and how laboratories verify a 99% claim.

Understanding Certificate of Analysis (COA) Verification

How to read a certificate of analysis, what to look for, and why third-party verification is non-negotiable.

What Are Research Peptides?

An introduction to peptides used in laboratory research — what they are, how they are synthesized, and why analytical purity matters.