• How is it stored?
• How is it prepared and administered?
• Are the same sites being used to inject?
• What time is it administered?
• Are there any issues with temperature when it is being administered?

After chatting to the doctor Carlos - being lazy - realised he had been leaving his insulin vials in sunlight rather than packing them away which had made them less effective when administered.

He resolved to take more care of his stocks in the future (see physical barriers to insulin effectiveness for more information).

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