Peptide storage: fridge, freezer, room temp, and what kills product

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.