Protocols2026-03-28
Peptide storage: stability, reconstitution, and shelf life
A practical guide to keeping research peptides viable.
Dr. Aiden Cho
Research pharmacist
Lyophilized vs reconstituted
Freeze-dried (lyophilized) peptides are remarkably stable when kept dry, dark, and cold — most retain >95% potency for 24+ months at -20°C. Once you add water, the clock starts.
Reconstitution best practice
Use bacteriostatic water (0.9% benzyl alcohol) for anything you'll keep more than a few days. Pipette gently down the side of the vial — never inject directly into the powder. Swirl, don't shake.
Shelf life after reconstitution
Most common research peptides hold up for 2–4 weeks refrigerated at 2–8°C. BPC-157 is famously fragile; CJC-1295 (no DAC) and Ipamorelin are sturdier. Never freeze-thaw a reconstituted vial — ice crystals shred the peptide chain.
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