i would use it
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#storage-coldchain 2026-04-29
Wednesday47 messages11 participantstimes are UTC
Highlights from this day
- logrotate — the shape of it. these are community conventions, not stability data on your specific vial 18:38
- logrotate — because it depends on the peptide, the diluent, the concentration, and how many times you punctured the stopper 19:00
- lean_mass_lex — four to six and use it up. if you are still on a vial at week ten, you diluted too much 20:07
a few hours at room temperature is almost certainly nothing. a week is a different conversation
buy a thermometer. mine reads 4.8 on the door and two degrees lower at the back
powder is robust
back of the fridge
how cold is too cold, can it actually freeze in a normal fridge
solution is not
thats fine
while im here best travel setup for 5 days away with vials
i log the fridge temperature daily and the room has never let me forget it
two to eight
hotel minibars are frequently not cold enough. i take a thermometer, which is ridiculous and also correct
coming back after 11 months, is the pinned storage table still current
a liquid cold pack tells you it was above freezing, not that your vial cooked
for the archive the door swings four or five degrees every time somebody opens it. the back barely moves
i left it out overnight by accident, bin it or use it
log 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 6.8two to eight degrees. most domestic fridge doors are not in that range and people do not check
how long does a mixed vial last in the fridge
weeks. not months. the exact number is where the arguing starts
the shape of it. these are community conventions, not stability data on your specific vial
| State | Condition | What people here work to |
|---|---|---|
| lyophilised powder | 2-8 C, dark | long. months and up if the seal held |
| lyophilised powder | room temp, in transit | days to weeks is fine, it is why it ships dry |
| reconstituted | 2-8 C, dark | commonly treated as good for about 4-6 weeks |
| reconstituted | room temp | hours to a couple of days, and the clock is running |
| reconstituted | frozen | contested — see the other conversation in here |
| either | direct sunlight | no |
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why is the reconstituted number so vague
because it depends on the peptide, the diluent, the concentration, and how many times you punctured the stopper
a manufacturer who runs stability studies gets a number for one exact formulation. we do not have that
the licensed pens have a printed in-use window and people quote it at everything. it does not transfer
same molecule, completely different formulation and container. not the same thing
so four weeks-ish and do not be precious about it
four to six and use it up. if you are still on a vial at week ten, you diluted too much
🎯6
which is a recon volume decision, not a storage decision
correct. #reconstitution is where you prevent this happening
does light actually matter
peptides are not especially photostable and the vials are usually clear glass
keep it in the box. costs nothing
mine lives in an opaque tub in the fridge door, which i am told is the wrong shelf
the door is the worst place in a fridge. it swings the most
a dorm fridge door can cycle several degrees over a day. buy a thermometer, they are a few quid
a thermometer for a fridge feels excessive
it costs less than one vial
✅11
mine reads 3 to 7 across a day and i still think that is fine. that range is inside spec
it is. the problem is the people who assume and never look. mine sat at 11C for a month
how did you find out
thermometer
fair
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pinning the table
21:30quiet.hours pinned a message
bought one. middle shelf reads 4.5, door reads 8.5 in the evening
and that is why i am moving off the door. thanks for actually measuring it
the whole point is knowing rather than believing