Having laid out why MOTS-c travels well, the honest counterweight. The traveller route solves transit and solves nothing else, and two problems are left standing.
The first is identity. On a compound this obscure, sourced abroad from a supplier you cannot visit, with no pharmacy chain and no regulatory oversight anywhere in the path, the question of whether the vial contains MOTS-c at all is not paranoid. Demand a third-party certificate of analysis per batch and match the batch number on the paperwork to the number on the vial. A traveller who saved a thousand pesos on an unverified vial has not saved anything.
The second is the protocol itself. A 10mg vial at the commonly cited 5mg dose is two injections, so a block consumes vials quickly and a three-week trip abroad means either travelling with reconstituted material that needs 2 to 8 degrees and an insulated pouch, or accepting a gap. And underneath all of it: the MOTS-c evidence base is rodent and cell-model work. AMPK activation, nuclear translocation under metabolic stress, adipose thermogenesis, improved exercise capacity in aged mice. No human efficacy data supports any of those outcomes in a person. Building a complicated international logistics operation around a compound at that stage is a lot of effort for an open question.