Tools

Peptide storage stability reference

Peptides degrade at rates that depend on whether they are stored as a lyophilized powder or reconstituted in solution, and on temperature. This page collects published storage-stability figures per peptide, in days, with the source for each. Where the published record is thin, the cell reads “insufficient published data” rather than a guess.

— = insufficient published data

Lyophilized versus reconstituted storage

A lyophilized (freeze-dried) peptide is far more stable than the same peptide dissolved in water. In powder form, many peptides tolerate refrigeration or freezing for months to years. Once reconstituted, the molecule is in solution and subject to hydrolysis and aggregation, so its usable window is typically much shorter — often measured in weeks when refrigerated. The two states are reported separately here because they are not comparable: a peptide stable for two years frozen as a powder may be stable for only weeks once mixed.

How temperature affects stability

Lower temperatures slow the chemical and physical processes that degrade peptides. For most peptides the ordering is freezer, then refrigerator, then room temperature — both as a powder and in solution. The figures in this table are the published storage windows under each condition; they describe how long a preparation is reported to remain within specification, not a recommendation for how to handle any specific compound.

Why most cells say “insufficient published data”

Measured day-by-day storage stability is rarely published for peptides. What sources actually report is almost always a storage condition— “store at 20–25°C,” “protect from light,” “keep refrigerated” — or a handling instruction such as “use immediately after reconstitution.” Those describe how a preparation should be kept; they are not a measured number of days it stays within specification.

This holds even at the top of the evidence scale. FDA-approved peptide drug labels specify a storage temperature and reconstitution handling, yet typically state no shelf-life as a day-count. Vendor “stable” claims with no measured study behind them fall short of the same bar. Rather than convert a condition or a handling note into a day-count we cannot defend, this table leaves the cell “insufficient published data.” A figure appears only once a specific, sourced measurement supports it — so the table will fill in as additional source types and peptide-specific measurements surface.

Figures are drawn from a tiered set of sources — peer-reviewed literature first, then FDA-approved drug labels, documented manufacturer certificates of analysis, and applicable industry standards — recorded in days, and reviewed before they are published here. Each published figure carries the source it was verified against and the date of that check. Empty cells are gaps in the published record, not omissions.