Why temperature and light matter, and how to store your vials once they arrive.
Lyophilization (freeze-drying) removes water from a peptide solution under vacuum, leaving a stable powder that degrades far more slowly than the same peptide would in liquid form. That stability is why almost every product in the catalog ships this way — but it is not indefinite stability, and it depends on the powder actually being kept cold and dark, as printed on the label (36–46 °F, i.e. a standard refrigerator, not a freezer unless otherwise noted).
Light and heat are the two things that most accelerate degradation in an unreconstituted lyophilized peptide, so vials are best kept in their original packaging, away from direct light, until they're ready to be used. Once a vial is reconstituted with bacteriostatic or sterile water, the clock changes: a reconstituted solution has a meaningfully shorter stability window than the dry powder and should be kept refrigerated and used within the timeframe appropriate to that specific peptide.
A few general handling practices apply across nearly all lyophilized research peptides: minimize how long a vial sits at room temperature, avoid repeated freeze-thaw cycles on reconstituted solution, and reconstitute gently (swirl rather than shake) to avoid denaturing the peptide. Our reconstitution calculator can help work out concentration and draw volume once a vial is mixed.
This note summarizes published research and general handling practice — it is not medical advice, a dosing recommendation, or a claim about safety or effectiveness for human use. For Research Purposes Only, Not For Human Consumption.