Learn how to read the evidence
Independent, plain-English explainers on certificates of analysis, lab testing, and reading vendor evidence. No product claims — just how to check the paperwork yourself.
All guides
Audit Panda: What the Term Means and How to Audit a Peptide Certificate of Analysis
A documentary reading of a search phrase that has no chemical identity, and a practical method for auditing the lab evidence a research peptide supplier publishes.
Mass Spectrometry HPLC: What a Coupled LC-MS Report Actually Shows
A plain reading of how chromatographic separation and mass measurement are combined in one analysis, and how to judge the resulting certificate.
Expertise Peptides: A Guide to Reading the Lab Evidence
A calm, evidence-first look at how to read the laboratory documentation behind any peptide sold for research use only.
The Testing Date on a Certificate of Analysis: Reading Document Freshness
A CoA describes one batch at one moment in time - the date tells you which moment, and whether the paperwork still applies.
Mass Balance on a Peptide CoA: Why the Numbers Should Add Up
How a complete accounting of purity, water, salts and impurities separates an honest certificate of analysis from a single decorative percentage.
Cold Chain and Storage Disclosure for Lyophilised Peptides
What responsible vendors publish about temperature, packaging and transit time - and why it belongs in a documentary transparency assessment.
What a Peptide Map Tells You About Identity
How fragment analysis confirms a peptide is the molecule claimed, and why that is a different question from purity.
Why a Vendor's Transparency Score Changes Over Time
How new certificates, expired documents and method changes move a score - and why a dated changelog is itself a credibility signal.
What Residual Solvent Testing Covers on a Peptide CoA
How a certificate of analysis documents the trace solvents left after synthesis and purification, and how to read that evidence.
Counter-Ions and Salt Forms: TFA vs Acetate
Why the salt a peptide is paired with changes its net content, and how a transparent certificate of analysis makes that clear.
How to Spot a Fake or Edited Certificate of Analysis
A practical, non-medical field guide to the tells that separate a real lab document from an edited or invented one.
Net Peptide Content vs Purity: Why a CoA May Report Two Different Numbers
How HPLC purity and net peptide content answer different questions, and why a transparent certificate of analysis can show both.
What ISO/IEC 17025 Accreditation Actually Means for a Peptide Lab
A plain-language look at what accreditation certifies about a testing laboratory, and why it belongs on your CoA checklist.
Mass Spectrometry and Peptide Identity: Confirming What a Compound Actually Is
How measuring molecular mass answers a question that a purity percentage alone never can.
How to Read an HPLC Chromatogram
A plain-language walkthrough of the trace behind every purity number, so you can judge the evidence yourself.
Peptide Vendor Transparency Red Flags: A Documentary Checklist
How to read a vendor's paperwork - not its marketing - and judge whether its lab evidence is verifiable at the source.
How to Verify a Certificate of Analysis at the Source
A step-by-step guide to authenticating a peptide CoA on the testing laboratory's own domain, and reading what a broken verification link really tells you.
Peptide Endotoxin and Sterility Testing Explained
How LAL endotoxin (USP <85>) and sterility (USP <71>) testing differ from a purity and identity certificate of analysis, and why that data is usually absent.
Batch-Level Certificate of Analysis vs a Generic CoA
How a lot-specific certificate proves what is in the vial, and why a single reused certificate cannot.
Understanding Peptide Purity Percentages on a Certificate of Analysis
What that HPLC figure measures, what it leaves out, and why the trace behind the number is the real evidence.
What Is Independent Third-Party Peptide Testing?
How to tell whether the lab behind a certificate of analysis is genuinely independent, named, and accredited - and why that matters.
How to read a peptide certificate of analysis (CoA)
Every element a genuine CoA contains, how to read the purity and identity results, and the red flags that separate real third-party testing from a decorative PDF.
HPLC vs mass spectrometry
Purity and identity are different questions. Here is what each method proves — and why a CoA is strongest when it shows both.
The independent peptide labs
Who the third-party labs behind peptide CoAs actually are, which let you verify a certificate at the source, and how much accreditation really tells you.