Storage & stability
A peptide is only as good as its purity on the day you use it. Temperature, light, freeze-thaw cycles and transport all act on stability, and the right storage choice depends on whether the vial is dry or reconstituted.
Storage at a glance
How a vial should be stored depends on its state. The dry, lyophilised form is the most robust; once reconstituted, the clock starts.
| State | Temperature | Light | Typical stability |
|---|---|---|---|
| Lyophilised (dry) | −20 °C freezer | Keep dark | Many months to years |
| Lyophilised (short term) | 2–8 °C fridge | Keep dark | Weeks, for convenience |
| Reconstituted | 2–8 °C fridge | Keep dark | Days to several weeks* |
| In transit | Cold-chain / cool pack | Boxed | Short, by design |
*Depends on the compound and on whether bacteriostatic or sterile water was used; always defer to the COA.
Do's and don'ts
Do
Keep dry vials in the freezer, store reconstituted vials in the fridge, keep everything dark, and return dry vials to the freezer promptly after they arrive.
Avoid
Don't freeze a reconstituted vial, don't leave anything in sunlight or warmth, and don't subject a solution to repeated freeze-thaw cycles.
Freeze-thaw, light & heat
Three stressors do most of the damage. Each has a simple countermeasure.
Freeze-thaw
Repeated freezing and thawing stresses the peptide bond. Keep a reconstituted solution in the fridge, not the freezer, so it is never cycled.
Light & heat
UV light and warmth both accelerate degradation. Keep vials dark and cool, a closed box in the fridge is ideal.
Brief warming
The dry, lyophilised form tolerates short warming in transit. It is the reconstituted solution that is sensitive, handle that one with more care.
Travel & cold-chain
Peptide.ST ships temperature-protected, so a vial arrives with its purity intact even after time in transit. The short warming a dry vial may see on the way is by design and well tolerated.
On arrival
Return dry vials to the freezer promptly when a shipment lands. For the full handling detail, see the Peptide.ST shipping policy.