Laboratory reference
Peptide Storage: A Laboratory Reference
PepSmartUSA Research Team · Updated 2026-08-26 · 4 min read · Laboratory guidance only
Peptide stability is mostly a fight against three things: moisture, light, and repeated temperature swings. The rules are short.
Lyophilized (as shipped)
- Long-term: −20 °C, desiccated, dark. Years-scale stability for most sequences.
- Short-term: 2–8 °C (standard lab refrigerator) is fine for weeks-to-months.
- In transit: ambient temperature is not a problem for lyophilized material over shipping timescales — moisture ingress is the failure mode, which is why sealing and desiccant matter more than ice packs.
- Avoid: freeze-thaw cycling and humid storage. Let cold vials reach room temperature before opening so condensation doesn't wet the cake.
Reconstituted
- Refrigerate at 2–8 °C, protect from light, and label with the preparation date.
- With bacteriostatic diluent, plan around a conservative multi-week window; without preservative, handle the preparation as single-session.
- Discard on cloudiness, particulates, or color change — no exceptions.
Aliquoting
For sequences you'll draw from over a long program, aliquot the reconstituted solution into single-use volumes and freeze the aliquots — each vial then sees exactly one freeze-thaw.
For research use only. Nothing in
this reference is medical advice or an instruction for administration of any kind.