Storage & Handling Guide
For research use only · Last updated: July 2026
Proper storage keeps research peptides stable and potent. This guide covers how to store your vials before and after reconstitution, how to handle bacteriostatic water, and typical shelf-life ranges. These are general laboratory-handling notes — not medical or usage advice.
Unopened (lyophilized)
Sealed powder vials are stable and forgiving. Keep cool, dark and dry until you reconstitute.
After mixing
Once liquid, refrigerate at 2–8 °C and use within a few weeks. Never freeze a reconstituted vial.
Sterile technique
Swab every stopper with alcohol, use a fresh syringe each time, and avoid touching the needle.
1. Before reconstitution (lyophilized powder)
Lyophilized (freeze-dried) peptides are very stable. For short periods (a few weeks) they can sit at room temperature away from light and heat. For longer storage, keep them refrigerated, and for many months or longer, a freezer is ideal.
- Short term (weeks): cool, dark cupboard — below 25 °C.
- Medium term (months): refrigerator, 2–8 °C.
- Long term: freezer, −20 °C or colder. Avoid repeated freeze/thaw cycles.
- Keep vials in their box — light and humidity are the enemies of peptide stability.
2. Bacteriostatic & acetic acid water
Bacteriostatic water (0.9% benzyl alcohol) is your standard diluent and can be reused for multiple draws because the benzyl alcohol limits bacterial growth. Some peptides dissolve better in acetic acid water.
- Store sealed water vials at room temperature, away from direct sunlight.
- Once opened, keep refrigerated and swab the stopper before each use.
- Stable for 28 days after opening when kept refrigerated — discard after that even if it looks fine.
- Check the fluid is clear before use — discard if cloudy or discoloured.
3. After reconstitution (liquid)
Once you add water, the peptide is far more delicate. Always refrigerate and protect from light.
- Refrigerate at 2–8 °C — the door shelf is fine.
- Do not freeze a reconstituted vial — ice crystals can damage the peptide.
- Keep away from heat and sunlight; return it to the fridge promptly after each draw.
- Add the water slowly down the inside wall of the vial — don't spray it directly onto the powder, and swirl gently rather than shaking.
4. Typical shelf-life at a glance
| State | Storage | Typical stability |
|---|---|---|
| Lyophilized, sealed | Freezer (−20 °C) | Long term (many months+) |
| Lyophilized, sealed | Fridge (2–8 °C) | Months |
| Lyophilized, sealed | Room temp, dark | Weeks |
| Reconstituted (liquid) | Fridge (2–8 °C) | ~2–4 weeks (peptide dependent) |
| Bacteriostatic water | Fridge after opening | 28 days after opening |
Ranges are general guidance for research handling and vary by compound. When in doubt, colder is safer.
5. Sterile handling checklist
- Wash hands and work on a clean surface.
- Swab the rubber stopper with an alcohol wipe and let it dry.
- Use a fresh, sterile syringe/needle for every draw.
- Don't let the needle touch anything but the clean stopper.
- Reseal and refrigerate immediately after use.