How to store P21

Lyophilised (freeze-dried) storage

Unreconstituted P21, like most research peptides, is stable when stored in its original sealed vial at -20°C for long-term storage. For short-term use (under 3 months), refrigeration at 2-8°C is acceptable. The vial must be protected from direct light and moisture.

Peptify dispatches P21 in temperature-tolerant packaging from the UK, usually arriving within 24-48 hours of dispatch.

After reconstitution

Once P21 is reconstituted with bacteriostatic water (BAC water, 0.9% benzyl alcohol), the solution should be stored at 2-8°C (refrigerated) and used within 28 days. Bacteriostatic water's preservative system inhibits microbial growth for roughly four weeks after first puncture — significantly longer than sterile water, which must be used immediately.

Avoid freeze-thaw cycles. Never leave the vial at room temperature for extended periods, and keep it in its original rubber-stoppered vial to minimise contamination risk.

Shelf life and quality verification

Peptify publishes a batch-specific expiry date on every P21 COA, alongside HPLC chromatogram data and mass spectrometry confirmation. The full Certificate of Analysis for your specific batch is downloadable from the product page.

Buy P21 for research

99%+ HPLC-verified P21 in stock. Every vial ships from the UK with a batch-specific Certificate of Analysis. Same-day dispatch on orders before 1pm.

• P21 10MG

Frequently asked questions