17 practical laboratory guides
Peptide testing guides.
Choose a guide to compare methods, understand a certificate, or prepare a sample for shipping.
Start with these guides
Start with the difference between purity and content, the fields on a COA, and the details to check before relying on a report.
Purity is not content
How chromatographic purity differs from measured milligrams, and which result answers your question.
Buying and verifyingHow to read a peptide COA
The fields, methods, results, and limits on a certificate, and how to tell a document that shows its work from one that does not.
Buying and verifyingTwelve red flags on a peptide COA
A checklist for the certificate you were handed: what is missing, what is unverifiable, and what quietly overstates its scope.
6 guides
Method guides
- 7 min
How peptide purity is measured
What a purity percentage is actually counting, why it is method-dependent, and the checks that make it defensible.
- 6 min
Purity versus identity: what each test answers
Chromatographic purity and identity confirmation answer two different questions, and a certificate needs both.
- 8 min
Purity is not content
How chromatographic purity differs from measured milligrams, and which result answers your question.
- 9 min
How to read a chromatogram
Axes, baseline, principal peak, related substances, integration, and the four things a clean-looking trace does not prove.
- 8 min
Endotoxin and microbial testing explained
What bacterial endotoxin testing measures, and how it differs from microbial counts and sterility testing.
- 7 min
Heavy metals in peptide samples
Where elemental contamination comes from, what a four-element panel covers, and why a result without a specification is not a pass.
7 guides
Buying and verifying
- 6 min
How to read a peptide COA
The fields, methods, results, and limits on a certificate, and how to tell a document that shows its work from one that does not.
- 9 min
Twelve red flags on a peptide COA
A checklist for the certificate you were handed: what is missing, what is unverifiable, and what quietly overstates its scope.
- 7 min
Third-party peptide testing: choosing a laboratory
What to ask before you mail anything, and which answers should end the conversation.
- 5 min
A Canadian alternative to Janoshik
Sending samples overseas or testing in Canada: shipping, customs, currency and tax, and the checks that stay the same.
- 5 min
Research peptides in Canada: checking a supplier
Five checks that turn a supplier’s certificate from a claim you trust into one you can verify.
- 6 min
Group peptide testing: pooling for one certificate
How a community splits the cost of testing one product, who should buy the vial, and how everyone checks the same result.
- 9 min
Underdosed and mislabelled: what testing actually finds
The four failure modes analysis distinguishes between, why they need different tests, and what each one looks like on a report.
2 guides
Sending a sample
2 guides
Sector guides
- 9 min
Testing GLP-1 and incretin analogues
Why label claim is the question on this class, what acylated side chains do to a chromatogram, and what a clean purity figure hides.
- 10 min
Testing programmes for vendors and clinics
Lot-level sampling, publishing results your customers can verify, and building a testing cadence that survives scrutiny.