What Is the Difference Between U40 and U100 Syringes? If you or your pet takes insulin, you've likely seen syringes branded U40 or U100. These seemingly insignificant figures have a significant impact. Understanding what they represent is one of the most critical aspects of administering insulin safely. source : https://www.kdlnc.com/difference-between-u40-and-u100-syringes/ #InsulinSyringes #U40vsU100 #DiabetesCare #InsulinDosing