nobody here can tell you a vial is safe. we can tell you what has and has not survived for us
#storage-coldchain 2026-05-05
Tuesday30 messages7 participantstimes are UTC
Highlights from this day
- fibre_first — anyone tested a vial before and after a bad transit 12:45
- fibre_first — two to eight degrees. most domestic fridge doors are not in that range and people do not check, i have it written down somewhere 12:47
- auckland_aliquot — update from 18 months ago: replaced the fridge, temperature is stable, no more anxiety 14:39
how long is reconstituted actually good for at room temperature
anyone tested a vial before and after a bad transit
✅2😂17
two to eight degrees. most domestic fridge doors are not in that range and people do not check, i have it written down somewhere
🎉2✅7
i would use it
🧪3👍2
light exposure matters much less than temperature for these. i still keep them in the carton
a cooler with two gel packs held under eight degrees for eleven hours on a drive, i think
my fridge is 3.1
is there a difference in stability between the compounds
powder is robust
sorry to jump in flying with vials, hand luggage or checked
hand luggage
i would bin it
mon 4.1 / door 7.2
tue 4.0 / door 7.8
wed 4.2 / door 6.9
thu 3.9 / door 7.4
fri 4.1 / door 8.1 <- shopping day
sat 4.3 / door 7.0
sun 4.0 / door 6.8do i need to worry about light exposure or is that overthinking
update from 18 months ago: replaced the fridge, temperature is stable, no more anxiety
| Condition | Lyophilised | Reconstituted |
|---|---|---|
| 2-8 °C | fine, long term | fine, weeks |
| Room temp, days | fine in every report here | reported fine, shorter |
| Room temp, weeks | reported fine | do not |
| Warm transit, 30 °C+ | no failure logged | one visible degradant peak |
| Frozen once | fine | contested, no consensus |
| Freeze-thaw cycled | fine | the room says no |
not the freezer
🎉2😂10🤝2
cold pack arrived completely liquid, does that mean anything
*that should say weekly
slightly off topic but i freeze aliquots and have had them test fine afterwards. others here would not do it and i understand why
i left it out overnight by accident, bin it or use it
if you are worried after a bad transit, test it. that is what the testing channels are for
anyone had a vial visibly change after a warm transit
solution is not
i left a reconstituted vial out overnight once, sent it for testing out of curiosity, it came back fine
power cut with the door shut for a few hours is fine. a full fridge holds temperature surprisingly well
freezing reconstituted peptide is the one thing this channel has never agreed on
power cut for 6 hours, fridge stayed shut, am i fine
a liquid cold pack tells you it was above freezing, not that your vial cooked
test it
the practical risk in winter shipping is freezing, and in summer it is heat. plan for the season you are in