Peptide Storage Guide: Lyophilized vs Reconstituted
Storage rules differ completely before and after reconstitution.
By PX1 Research Team · August 4, 2026
Peptide Storage Guide: Lyophilized vs Reconstituted
Lyophilized
Sealed vials are stable at ambient for shipping and 18–24 months cool, dry and dark. −20 °C is preferred long-term. Desiccated storage prevents hydration-driven degradation.
Reconstituted
2–8 °C, protected from light, with a 28-day in-use window when bacteriostatic water is used. Aliquot before freezing; repeated freeze-thaw cycles cause aggregation and purity loss.
Transport
Ambient transit is correct for sealed lyophilized material. Reconstituted vials should not be shipped.
How PX1 documents every lot
Every PX1 lot ships with HPLC purity, LC-MS identity, residual solvent, moisture (Karl Fischer), sterility and endotoxin data. Lot documentation is published at /purity-reports, /endotoxin-reports and /coa. Synthesis, purification, lyophilization and vial fill happen in U.S. facilities — see /manufacturing-process.
Research use only. PX1 Research supplies compounds for laboratory and in-vitro research. Nothing here is medical advice, a dosing recommendation, or an offer for human or veterinary use. Figures cited are reported from published laboratory literature.