Question: what is the difference between u-40 and u-100?
Answer: A U-40 insulin has 40 units of insulin in each milliliter (mL) of liquid. This means that the same volume (liquid amount) of a U-100 insulin has 2.5 times more insulin in it than a U-40 insulin. ... Most commercially available insulins are U-100 and the syringes we purchase at the pharmacy are U-100 syringes.