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AhaBulb: Stuff Everyone Should Know · ahabulb.com/diab-insulin-heat-sun

Which is a bad place to leave insulin?

On a sunny car dashboard. Heat and direct sun weaken insulin.

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  1. In a cooler bag out of the sun
  2. On a sunny car dashboard ✔
  3. In the refrigerator

Why: Heat and direct sunlight make insulin less effective, and that can make blood sugar harder to manage. Keep it cool and shaded, away from direct heat.

Huh, didn't know that: FDA says that under emergency conditions you might still need to use insulin stored above 86°F.

The dad joke
Why didn't the sun go to college? It already had a million degrees.
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References

Answer: On a sunny car dashboard. Heat and direct sunlight make insulin less effective, and that can make blood sugar harder to manage. Keep it cool and shaded, away from direct heat.

  1. FDA, Information Regarding Insulin Storage www.fda.gov/drugs/emergency-preparedness-drugs/information-regarding-insulin-storage-and-switching-between-products-emergency
    Keep insulin away from direct heat and out of direct sunlight.
    Checked 2026-10-09.

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Health BasicsWhere should unopened insulin normally be stored?Health BasicsPer FDA general guidance, insulin in a maker's vial or cartridge can stay unrefrigerated up to about how long?Health BasicsYour insulin accidentally froze. What does the FDA say?

That's stuff everyone should know.