Peptide storage: fridge, freezer, room temp, and what kills product
How to store lyophilized vs reconstituted peptides so you do not throw money away.
Lyophilized (powder) peptides: Refrigerate at 2-8°C for short term storage. Freezer for long term (months to years). Most peptides remain stable lyophilized for 18-24 months in a freezer. Do not freeze and thaw repeatedly.
Reconstituted peptides: Refrigerate immediately after mixing. Do not freeze reconstituted peptides, freezing degrades structure.
Stability windows reconstituted (general guidance, check vendor data sheets): BPC-157: 7-14 days TB-500: 30-60 days GHK-Cu: 30 days (use glass, copper binds plastic) Ipamorelin / CJC-1295 (no DAC): 14-30 days Semaglutide / Tirzepatide / Retatrutide: 30-60 days
Things that destroy peptides: heat, light, foaming, repeated freeze-thaw, contamination from reused needles.
Travel: fridge gel pack in a small insulated bag. Sub 24 hours at room temp is usually fine for the GLP class. For everything else, keep it cold.
If you suspect a vial has gone bad: cloudy solution, color change, visible particles, smell. Toss it. Do not inject.
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