I was actually the one with the frozen insulin experience on a cruise. In the end it pays to be defensive and to have multiple backups. Split your insulin into two batches. Don’t trust refrigerators or others with it. Plan out how to buy it in your destination(s). Bring prescriptions and find out which pharmacies are trustworthy. According to Sanofi, Lantus is available in 120 countries. And use a frio. I have had good experience and have several, they work as claimed but start to fail in very humid conditions.
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