PeptideChemSF said:

Storage question about storage and cold: my pen was left out of the fridge for 18 hours.

This matches mine closely enough to be worth saying so out loud.

TrialTracker_MD said:

Cold chain shipping for storage and cold: my last order arrived with the cold pack completely melted and the vial at room temperature.

Bookmarking. The distinction being drawn above is the one nobody else makes. Printing the relevant bit and taking it with me.

From the other side of the consultation, briefly.

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.

Dr.PainCLE said:

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

Second this. Posting only so the count is not one.

Moderator note: good thread. Keeping it here rather than moving it, because the question is general enough to be useful. No action needed from anybody.