Cold, dry and dark
Dry peptide powder is far more stable than a solution, but it still slowly breaks down. Labs usually store it sealed at around −20 °C for the long term, with a fridge (2 to 8 °C) common for short periods.
Freeze-dried powder is often hygroscopic: it pulls water from the air. Moisture speeds up breakdown, so vials stay tightly closed, sometimes with a desiccant.
Warm before opening
Opening a cold vial lets warm, damp air condense on the powder. Labs let the sealed vial come to room temperature first, then open it only as long as needed.
Some peptides need extra care
Peptides containing cysteine, methionine or tryptophan can oxidise when exposed to air. Labs may store these under an inert gas such as nitrogen or argon, and keep all peptides out of direct light.
Educational information only. Nothing here is medical advice, dosing guidance or a recommendation to use any substance. Research peptides are not approved medicines and are not for human or animal consumption. Speak to a qualified professional and follow the law where you are.
