Question: is humulin fast acting insulin?
Answer: Humulin R U-100 is a short-acting insulin, which means it can cover insulin needs for meals eaten within 30 minutes. There are 2 types of Humulin R insulin: Humulin R U-100 and a more concentrated insulin, Humulin R U-500. U-100 insulins, including Humulin R, contain 100 units per mL.