How long do peptides actually last in Australian conditions?

Peptides degrade fastest when warm, wet, or both, and Australia is a tough environment for both shipping and home storage. Here's what the chemistry actually says.

Lyophilised (powder) peptides

Sealed lyophilised peptide vials kept at −20°C are typically stable for 12-24 months for most sequences. At fridge temperature (2-8°C), expect 6-12 months. Above 25°C, typical Australian summer storage in a kitchen, degradation accelerates exponentially and visible discolouration can appear within weeks.

Reconstituted peptides

Once mixed with bacteriostatic water, most peptides are stable in the fridge for 14-28 days depending on sequence. BPC-157 and TB-500 tolerate reconstitution well. GLP-1s (semaglutide, tirzepatide, retatrutide) are sensitive to repeated temperature swings: keep them in the back of the fridge, never the door.

Shipping risk in Australia

Vials shipped through Australian customs in summer routinely sit at 35°C+ for days. A vendor that doesn't use insulated packaging with a phase-change gel is shipping you a partially-degraded product. Independent post-shipment testing is the only way to know what arrived.

How to tell a degraded vial

• Yellow or brown tint on a powder that should be pure white.
• Cloudy reconstituted solution after a few minutes.
• Reduced clinical effect at a previously-effective dose.