Insights
Buy peptides with fewer surprises.
Practical guides for lab buyers and reviewers: what to put in an RFQ, how to read a lot COA, and what each analytical number does — and does not — tell you.
Buying guides
How to write a peptide RFQ that gets a complete quote
A seven-line RFQ for research peptides: product and SKU, kits, destination, timing and the documents you need — so the first reply is a usable quote.
Buying guideSample COA vs lot COA: reading HPLC and MS evidence
What a sample COA can and cannot show, how a lot COA links results to your lot, and a three-gate check for HPLC purity and MS identity before you accept a lot.
Buying guideReceiving research peptides and placing repeat orders
Plan receipt before dispatch, keep the order record with the delivery, and write repeat orders as explicit revisions so every new lot gets its own COA review.
Technical notes
A lot-documentation checklist for peptide procurement
A buyer-focused checklist for reviewing peptide SKU identity, lot-specific COAs, analytical results, acceptance criteria, quantity, and document traceability be
Quality & testingWhy HPLC and mass spectrometry answer different questions
Understand why HPLC purity and mass-spectrometry identity answer different questions in peptide lot documentation and how procurement teams should review both r
Quality & testingNet content, counter-ions, and water: three numbers buyers should separate
A procurement guide to separating labeled fill, HPLC purity, water and counter-ion contributions, and net peptide content when comparing research peptide quotat
ProcurementCAS, PubChem, and salt form: an identifier cross-check before ordering
How procurement teams can cross-check CAS, PubChem CID, molecular formula, molecular weight, sequence, salt form, and multi-component products before ordering.
Quality & testingHow to read a Certificate of Analysis
A practical guide to reading a research-peptide COA: identity confirmation by mass spec, RP-HPLC purity, water/counter-ion content, and the red flags that separ
Quality & testingNet peptide content vs. gross powder mass
Why the number of milligrams on a vial label isn't all peptide: counter-ion mass, residual water, and salt form explained, and how net peptide content changes r
Storage & handlingStorage and handling of lyophilized peptides
How lyophilized peptides are stored in the lab: frozen, refrigerated or room temperature by compound, freeze-thaw limits, solution handling and signs of degrada
ProcurementSourcing GLP-1 research peptides responsibly
What sequence verification, batch-specific COAs, and reference-code sourcing actually mean for GLP-1-class research peptides (semaglutide, tirzepatide, retatrut
ComplianceRUO compliance and per-order eligibility
What Research Use Only (RUO) framing means in practice, why buyer eligibility and intended-use confirmation exist, and how these checks shape what a research-pe
Quality & testingRP-HPLC purity, explained
What reversed-phase HPLC actually measures, how a purity percentage comes from peak-area integration, why HPLC alone doesn't confirm identity, and how it relate