For trips where temperature swings are likely I move just the amount of peptide needed for the whole time into a spare vial that gets tossed afterward. That keeps the main supply from seeing all the heat changes. With testosterone I bring the original labeled vial since it is a controlled substance that does not require refrigeration. Medication generally belongs in carry-on rather than checked bags.
Heading out on a two-week work trip and need to figure out the pinning schedule of 2 mg twice. Option A is to pack a 10 mg vial plus bac water and needles in checked luggage then reconstitute once at the destination hotel that has a fridge. Worries are the vial sitting at room or luggage temperature for the whole flight and whether the leftover reconstituted amount will survive the return trip. Option B is to preload two syringes with the dose, keep them in an insulated tote with cold packs, and hope they stay clear. Main concern there is accidentally freezing the doses. A feels safer but risks wasting product on the way back, while B is simpler yet uncertain about temperature control in a bag. Any real-world experience with either approach or something else I haven't considered? I considered taking an empty needle bag through security but I'm not comfortable making up a diabetic story with unmarked syringes.