How long do lyophilized peptides last? Four makers' figures
Shelf-life figures for lyophilized peptides as sb-PEPTIDE, GenScript, peptide.com and JPT state them, by temperature, and why none is an expiry date.
Tag archive
Documentation
Are peptides legal? FDA's own lists, peptide by peptide
Are peptides legal? The answer is in FDA documents. We read the category 2 list and the July 2026 advisory agenda and tabled each peptide's status.
How to store lyophilized peptides, per three manufacturers
Lyophilized peptide storage as GenScript, JPT and peptide.com publish it: cold, dry, dark, warmed before opening. Where the three pages disagree.
What Karl Fischer water content means on a peptide COA
Karl Fischer water content on a peptide COA is the water share of the powder by mass. How USP authors subtract it, and what vendor ranges rest on.
How to read a peptide COA: each line, and what it ties to
How to read a peptide COA line by line: what identity, purity, quantity and endotoxin results show, and what a vendor or anonymised COA ties them to.
Accreditation marks on a peptide test report: A2LA, ANAB and the ILAC/IAF merger, assessed
A logo on a certificate of analysis is not a purity grade. Assessed: what an ISO/IEC 17025 accreditation attests, why scope is the whole of it, and why the mutual-recognition line printed on reports is mid-rename.
Bacterial endotoxin testing, assessed as documentation a purity figure cannot supply
A percentage by HPLC is a chemical result. Endotoxin is a microbiological one, with its own method, its own calculated limit and its own report. Assessed on what a bacterial endotoxins test records and what it leaves open.
A 70-month sentence puts forged laboratory certificates on the record
The operator of a research-chemical seller was sentenced in late July after admitting the business forged laboratory certificates. For a market that runs on seller-hosted PDFs, that admission is the part worth reading.
'Research use only' is a use statement, not a quality grade
The most-printed phrase in research supply carries no method, no measurement and no issuing body. Assessed on what it commits a seller to, how regulators have read it, and which fields on a label do the work instead.
FDA's 503B Bulks List, assessed as a document rather than a verdict
A public, dated, numbered federal docket that circulates as though it were a register of approved substances. Assessed on what the notices record, how the process moves, and how little of it bears on a research-supply purchase.
The word 'peptide' is now doing two jobs on a label
Three August supplement launches print 'peptide' on the front of the container. The paperwork behind that word is a different kind of document from the one a research-supply buyer reads.
The vendor-published certificate of analysis, assessed as evidence
The COA is the central document in research supply and the least examined. Assessed on what it actually establishes, what it leaves open, and how far a buyer can rely on it.
Third-party assay reports become a competition point in research supply
Vendors of research peptides spent years competing on price per milligram. A growing number now compete on whose laboratory signed the report.
