How to Store Peptides Properly
Peptides are delicate, and how you store them directly affects their potency. Here's how to keep both lyophilized (powder) and reconstituted (mixed) peptides stable.
Storing lyophilized (powder) peptides
In their freeze-dried powder form, most peptides are surprisingly stable:
- Room temperature: often stable for weeks to a couple of years depending on the peptide, though cooler is always better.
- Refrigerated (2–8°C): extends shelf life significantly.
- Frozen (-20°C or colder): best for long-term storage — many peptides last indefinitely frozen.
Keep powder away from light, heat, and humidity.
Storing reconstituted peptides
Once mixed with bacteriostatic water, peptides are far more fragile:
- Always refrigerate reconstituted peptides (2–8°C).
- Most stay usable for a few weeks refrigerated — some longer, some shorter.
- Protect from light — some peptides degrade with light exposure.
- Don't freeze reconstituted peptides unless you know the specific compound tolerates it — freeze-thaw cycles can damage them.
General tips
- Swirl, never shake — agitation damages peptides.
- Label your vials with the reconstitution date so you know how old they are.
- Track expiration so you don't dose a degraded vial.
BioHack's vial inventory tracks each vial's reconstitution date and warns you before it expires.
Frequently asked questions
How should peptides be stored?
Unmixed lyophilized powder is best kept frozen for long-term storage, or refrigerated. Once reconstituted, keep the vial refrigerated and use it within roughly 2–4 weeks.
Can you freeze reconstituted peptides?
Freezing a reconstituted vial is generally avoided, since freeze-thaw cycles can damage peptides in solution.
Do peptides need to be refrigerated?
Reconstituted peptides should be refrigerated. Unmixed powder is more stable and can tolerate room temperature for shipping, but should be refrigerated or frozen for storage.
BioHack turns everything above into a tool — a reconstitution calculator, dose advisor, cycle planner, and 45-peptide library, all in one app.
Open BioHack →For educational and research purposes only. Not medical advice. Consult a physician before starting any peptide protocol. BioHack is a tracking tool and does not sell peptides.