A vial that spent nine days in an unrefrigerated overseas parcel is a different material to the one described on its certificate. Storage is not a footnote — in Australia it is the whole problem.
Australia adds two variables most peptide storage guides ignore: distance and heat. A parcel from an overseas warehouse to a regional Australian address can spend a fortnight in transit, and a summer letterbox in Perth or Darwin routinely exceeds 50 °C. Both of those happen after the certificate was issued.
Baseline storage targets
| State | Target temperature | Documented window | Notes |
|---|---|---|---|
| Lyophilised, sealed | -20 °C | 24+ months | Protect from light and moisture |
| Lyophilised, short term | 2–8 °C | Weeks to months | Acceptable for active stock rotation |
| Reconstituted | 2–8 °C | ~28–30 days | Aseptic handling, bacteriostatic diluent |
| Ambient transit | Minimise | Hours, not days | Insulated packaging required |
Freeze–thaw is cumulative damage
Every freeze–thaw cycle concentrates solutes at the ice interface and exposes the peptide to a pH shift as buffer components crystallise out. Two cycles are usually tolerable. Ten are not. The fix is boring and effective: aliquot on first reconstitution into single-use volumes and never re-freeze the parent vial.
What actually degrades
- Oxidation at methionine, cysteine and tryptophan residues — accelerated by light and dissolved oxygen.
- Deamidation at asparagine and glutamine, strongly pH- and temperature-dependent.
- Aggregation at the air–liquid interface, worsened by shaking and by repeated draws.
- Adsorption onto plastic surfaces at low concentrations, which quietly lowers your effective dose.
How Recovery Labs ships nationwide
Because stock is held in Australia, transit is measured in hours. Orders leave our facility the same business day when payment clears before the daily cut-off, packed in insulated mailers with the vial protected from crush and light, and tracked end to end via Express Post. A Sydney or Melbourne metro address typically sees delivery next business day; most regional addresses land inside two to three.
Is a domestic fridge good enough for reconstituted vials?
A dedicated fridge holding a stable 2–8 °C is adequate for short-term reconstituted storage. Avoid the door shelf, where temperature swings are largest.
Does the vial need to be protected from light?
Yes, particularly for sequences containing tryptophan or methionine. Keep vials in their carton or an opaque secondary container.
What happens if a summer delivery sits in a hot letterbox?
Lyophilised material tolerates short ambient excursions far better than reconstituted material, but repeated or prolonged heat exposure will degrade it. Use a delivery address that is attended, or redirect to a parcel locker.
