Peptide Storage Guide
Peptides are sensitive biological compounds — heat, light, moisture, and repeated freeze–thaw cycles can all reduce potency. Here’s how to store both unreconstituted powder and mixed solution correctly, for every peptide in our catalog.
Storing Powder (Lyophilized)
- Freeze for long-term storage. −20°C keeps unreconstituted peptide stable for many months.
- Refrigerate for shorter windows. 2–8°C is sufficient if you’ll reconstitute within a few weeks.
- Keep it dark. Store in the original vial/carton, away from direct light — UV exposure degrades peptide bonds.
- Keep it dry. Moisture accelerates degradation; keep the vial sealed and avoid condensation.
- Avoid temperature cycling. Don’t move vials repeatedly between freezer and room temperature.
- Let it warm up before opening. Bring a frozen vial to room temperature first to avoid condensation forming inside when opened.
Storing Reconstituted Solution
- Refrigerate immediately. Once mixed, keep the vial at 2–8°C at all times.
- Don’t freeze after mixing. Freeze–thaw cycles can break down the reconstituted peptide for most compounds.
- Use bacteriostatic water where possible. Its preservative helps inhibit bacterial growth and extends usable life versus sterile water.
- Mix gently. Swirl the vial softly — don’t shake vigorously, which can stress and denature the peptide.
- Label the vial. Note the reconstitution date so you always know how long it’s been in solution.
- Check before each use. Discard if the solution looks cloudy, discolored, or has visible particles.
Quick Reference by Peptide
General handling guidance for the peptides in our catalog. Always confirm exact stability windows against your batch’s Certificate of Analysis.
| Peptide | Powder (Unmixed) | Reconstituted Solution | Light Sensitivity | Note |
|---|---|---|---|---|
| Semaglutide | Freezer (−20°C) for long-term; fridge (2–8°C) is fine short-term | Refrigerate 2–8°C immediately | Sensitive — keep in original carton | Do not freeze once reconstituted |
| Retatrutide | Freezer (−20°C) for long-term; fridge (2–8°C) is fine short-term | Refrigerate 2–8°C immediately | Sensitive — keep in original carton | Investigational compound — handle per COA documentation |
| Tirzepatide | Freezer (−20°C) for long-term; fridge (2–8°C) is fine short-term | Refrigerate 2–8°C immediately | Sensitive — keep in original carton | Do not freeze once reconstituted |
| GHK-Cu | Freezer (−20°C) for long-term storage | Refrigerate 2–8°C immediately | Highly sensitive — copper complex degrades faster in light | Use an amber vial or wrap in foil |
| BPC-157 | Freezer (−20°C) for long-term; fridge (2–8°C) is fine short-term | Refrigerate 2–8°C immediately | Sensitive — keep in original carton | Avoid repeated freeze–thaw cycles |
Do’s & Don’ts
Store powder in the freezer if you won’t use it within a few weeks.
Refrigerate reconstituted solution the moment it’s mixed.
Keep every vial out of direct light, in its original packaging.
Label vials with the reconstitution date.
Freeze a vial once it has been reconstituted.
Leave vials sitting at room temperature or in sunlight.
Shake vials vigorously — always swirl gently instead.
Use a solution that looks cloudy, discolored, or has particulates.
This guide reflects general handling practices for peptide research compounds and is provided for informational purposes only. Exact stability windows vary by compound, concentration, and diluent — always refer to your product’s Certificate of Analysis (see our COA Checker) or contact us with questions. All products are sold strictly for laboratory and research use only.