There are different ways to take insulin, including syringes, insulin pens, insulin pumps ... Or you can inject insulin into other parts of your body, including your thigh, arm, and buttocks.

Once you open a vial of insulin or pen, another expiration date starts. Generally, insulin expires 28 days after it's opened (for a vial or pen), says Fernandez de Fiore, but some pens only last 7 ...