do i need to worry about light exposure or is that overthinking
#storage-coldchain 2025-12-02
Tuesday38 messages6 participantstimes are UTC
Highlights from this day
- reta_resting_hr — i left a reconstituted vial out overnight once, sent it for testing out of curiosity, it came back fine 13:24
- cedar_counts — i left it out overnight by accident, bin it or use it 14:59
- dublin_dose — parcel sat in a hot mailbox for 7 hours, is it dead 17:03
- tesa_tess — update from 26 months ago: replaced the fridge, temperature is stable, no more anxiety 17:31
i left a reconstituted vial out overnight once, sent it for testing out of curiosity, it came back fine
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door shelf or back of the fridge
do you log the fridge temperature or is that too far
not the door
follow up anyone had a vial visibly change after a warm transit
powder is robust
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i would bin it
two to eight
buy a thermometer. mine reads 6.2 on the door and two degrees lower at the back
the practical risk in winter shipping is freezing, and in summer it is heat. plan for the season you are in
what temperature does a domestic fridge door actually swing to
lyophilised powder is genuinely robust. a warm transit is far less likely to matter than people fear
freezing reconstituted peptide is the one thing this channel has never agreed on
flying with vials, hand luggage or checked
i would use it
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i left it out overnight by accident, bin it or use it
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my fridge is 4
freeze debate again
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update on the earlier thing a few hours at room temperature is almost certainly nothing. a week is a different conversation
unopened and in-use in the same place is fine. just keep the in-use one where you can reach it
nobody here can tell you a vial is safe. we can tell you what has and has not survived for us
how cold is too cold, can it actually freeze in a normal fridge
not the freezer
genuine question i log the fridge temperature daily and the room has never let me forget it
the door swings four or five degrees every time somebody opens it. the back barely moves
does anyone freeze reconstituted vials or is that madness
a liquid cold pack tells you it was above freezing, not that your vial cooked
hotel minibars are frequently not cold enough. i take a thermometer, which is ridiculous and also correct
buy a thermometer
| 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 |
slightly off topic but lyophilised at room temp for 18 days in transit, worried or not
power cut for 3 hours, fridge stayed shut, am i fine
parcel sat in a hot mailbox for 7 hours, is it dead
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power cut with the door shut for a few hours is fine. a full fridge holds temperature surprisingly well
update from 26 months ago: replaced the fridge, temperature is stable, no more anxiety
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cold pack arrived completely liquid, does that mean anything
solution is not
freeze thaw cycling is the risk, not one freeze. that is my read of it anyway