How many units of insulin are in a normal vial?

Typically, a standard vial of insulin contains 1000 units (U). However, the concentration of insulin may vary among manufacturers and depending on the specific type of insulin. Some insulin vials may contain different concentrations, such as 40 U/mL, 100 U/mL, or even 500 U/mL. It's important to check the specific vial's label to determine the exact number of units contained within.