julia.endo said:

Storage question about storage and cold: my pen was left out of the fridge for 6 hours.

Storage best practices for compounded storage and cold:

• Unreconstituted lyophilized powder: refrigerate (36-46°F), good for 12+ months
• Reconstituted vials: refrigerate, use within 28 days
• Pre-filled pens: refrigerate until first use, then room temp OK for 28 days
• Never freeze reconstituted peptides — ice crystals damage the protein
• Protect from light — store in original box or wrap in foil

When in doubt, refrigerate. Temperature abuse is the #1 cause of reduced potency in compounded peptides.

One concrete data point for the thread. One practical note: write down what you did and when, before you need it. Reconstructing a timeline from memory three months later is how people end up unable to answer the one question that would have resolved it.

RetaRick_CA said:

Storage best practices for compounded storage and cold: Unreconstituted lyophilized powder: refrigerate (36-46°F), good for 12+ months Reconstituted…

Adding the part of the answer the thread has not reached. Take it one variable at a time. Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent argument can untangle them after the fact.

A narrower follow-up, since the general answer is now clear:

Was that from a primary source or from a summary of one?

OP back with an update, since a thread like this is useless without one.

Update: the excursion was survivable and the vial was fine. I now keep a cheap fridge thermometer, which costs nothing and ends the argument.