Stated plainly: room temperature · cagrilintide.
This is asserted often enough that I assumed it was established, and then I went looking for the source.
I have searched the primary literature and found one paper that is adjacent but not on point.
Can anyone point me at a primary source, or confirm that there is not one?
room temperature is above the refrigerated band, and how far above is the whole answer. Room temperature is not a number, so take the pharmacopoeial 20–25 °C and its 22.5 °C midpoint: 17.5 kelvin above the 5 °C middle of a 2–8 °C refrigerator. The ten-degree rule of thumb — degradation rate roughly doubling per 10 K — puts that at about 3.4 times the refrigerated rate. It is an order-of-magnitude statement about a rate, not a shelf life, and the top of the 20–25 °C band runs about 1.4 times faster than the bottom of it. Lyophilised material tolerates this far better than solution does, which is why it is shipped that way, but "tolerates" is a statement about weeks and the vial is being asked about months. Log the excursion rather than guess at it. Nothing here is medical advice, and research-use-only material is not approved for human use.
This is the tag where the advice is cheapest to follow and most often ignored.
Reconstituted with a preservative-containing diluent: refrigerated, conventionally treated as usable for about 28 days from first entry. Without a preservative, single use and discard.
Position matters less than people think: upright or on its side makes no difference to a lyophilised powder, and upright is marginally better for a reconstituted vial because it keeps the stopper dry.
Residual moisture is the dominant determinant of solid-state stability, which is why desiccants accompany lyophilised material.
Appearance does not indicate stability; a normal-looking cake can be substantially degraded.
Keep the desiccant with the vial and the certificate with the lot code.
HPLC purity, identity confirmation and quantified content on the vial you actually hold. Reports arrive with the chromatogram attached, not just a number.
Submit a sampleFounded 1998. ISO 9001 and cGMP certified, 1,500+ staff and 200+ patents. The synthesis house behind a great many of the vials that get sent out for testing - batch-specific documentation with every order.
Visit GL BiochemThe short version: powder in the freezer or fridge, reconstituted in the fridge for weeks, and never anything on a windowsill.
Let a refrigerated or frozen vial equilibrate to room temperature before opening, so humid air does not condense water onto a cold cake.
Keep vials in their original carton or in an opaque box. Light exposure matters for tryptophan-containing sequences and for anything with a chromophore, and a closed box is free.
Equilibrate before opening or you condense water into the cake.
Answering this needs the intended duration, since a fortnight and two years call for different arrangements.
Store with the desiccant sachet if one was supplied, inside the secondary container rather than loose in a drawer. Residual moisture is the dominant variable in solid-state stability.
Keep the certificate with the vial, physically or as a photograph filed under the lot code. A vial without a traceable certificate is an anonymous vial regardless of where it came from.
The 28-day in-use period for preservative-containing multi-dose preparations is printed on the diluent labelling and is a long-standing pharmacy convention.
Minus eighty buys very little over minus twenty for a dry solid.
The honest answer is that ordinary refrigeration handles almost every case people ask about.
Lyophilised powder: refrigerated at two to eight degrees for months, frozen at minus twenty for longer. The gain from minus eighty over minus twenty is small for a dry solid and is not usually worth the arrangement.
The caveat is that storage conditions preserve what you have and cannot improve it.
Dry, cold, dark, still. Four words and you have the answer.
Start with the physical state, because lyophilised and reconstituted material have completely different storage answers.
Label the vial at reconstitution with the date, the concentration and the resulting units per dose. This is the single most useful thirty seconds in the whole process.
Photodegradation of tryptophan-containing peptides is documented and is the basis for light-protected storage recommendations.
Label the vial at reconstitution with date, concentration and units per dose.
Ask PeptideStack is a static archive. Posting is closed, but the norms are worth stating: answer the question that was asked, show your working, cite the trial or the certificate, and say plainly where the evidence runs out.