Storage
Category: Protocols · Last updated
Storage of research peptides is divided into two regimes: pre-reconstitution (the dry lyophilized cake inside the sealed vial) and post-reconstitution (the dissolved peptide in solvent).
Lyophilized (sealed vial)
Most peptide research compounds are stable for months to years at refrigerator temperature (2–8 °C) and indefinitely at –20 °C in the lyophilized form. Hygroscopic compounds (Selank, Semax, NAD+, certain blends) must remain in their original sealed vial until immediately before reconstitution.
Reconstituted (in solution)
Reconstituted peptide solutions are far less stable than the lyophilized form. Typical shelf-life at 2–8 °C ranges from 14 to 28 days depending on the compound:
| Peptide | Days at 2-8 °C reconstituted |
|---|---|
| BPC-157 | 28 |
| TB-500 | 28 |
| GHK-Cu | 14 (copper complex degrades faster in solution) |
| KLOW-Blend | 14 (limited by GHK-Cu component) |
| Tirzepatide | 28 |
| Semaglutide | 28 |
| MOTS-c | 28 |
| Ipamorelin | 28 |
| CJC-1295 | 28 |
| Retatrutide | 28 |
| Tesamorelin | 28 |
| Selank | 28 |
| Semax | 28 |
| NAD+ | 7 (aliquot-freeze for longer storage) |
Light-sensitivity
Copper-peptide complexes (GHK-Cu) and NAD+ are photosensitive. Store in amber-glass vials or wrap clear vials in foil to protect from ambient light.
Freeze-thaw considerations
Lyophilized cake tolerates freeze-thaw cycles indefinitely. Reconstituted peptide solutions do not — repeated freeze-thaw denatures peptide tertiary structure and accelerates aggregation. If long-term storage of reconstituted solution is required, aliquot into single-use volumes and freeze each aliquot separately at –20 °C.