Does all I insulin go bad after 28 days of being open

Hi all. I was just wondering does all insulin go bad at 28 days after being opened??

No… It depends on the storage contidtions. The assumption of 1 Month is based on getting possible bacteria in the solution.

The shelf-life and viability of insulin in varies according to type of insulin, the type of container it comes in (vial or cartridge) and how it is used (refillable cartridge, syringe, or insulin pump) and manufacturers instructions.


But in summary : Refrigerated (unopened) When properly refrigerated (do not freeze) insulin will keep until expiration date on package. If ever frozen, discard the insulin. Insulin expiration dates are usually 1-2 years form date of purchase.

Thank you for your reply! I have been wondering about this for awhile.