BariatricNurseD said:

Storage question about storage and cold: my pen was left out of the fridge for 8 hours.

Cold chain shipping for storage and cold: my last order arrived with the cold pack completely melted and the vial at room temperature. I contacted the vendor and they reshipped with better insulation.

What to look for in shipping: styrofoam inner container with ice packs. If your peptide arrives warm, contact the vendor immediately. Don't assume it's still good.

Adding the numbers, since they settle part of this. If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way. Most of the apparent contradictions in these threads dissolve at that step.

Dr.ReproEndo said:

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

Adding the part of the answer the thread has not reached. It is worth asking what the claim would look like if it were false. If nothing would look different, it is not a claim about the world and no amount of discussion will settle it.

Following on from Dr.NutriCornell — and this may be the naive question:

How would you tell the difference between that and the alternative explanation?

Closing the loop on my own question.

Follow-up — I binned the frozen one. Aggregation does not undo itself and I was not going to inject a maybe.