How much is 50 units in a syringe? A 50-unit syringe holds 50 units of insulin in 0.5 cc of liquid, and each line marks 1 unit. How many ml are in a unit of insulin? Insulin vials have U-100 insulin. That means there are 100 units of insulin in each milliliter (mL) of insulin. Is all insulin 100 units per ml? Doses of insulin are measured in units. U-100 insulins, including Humulin N, contain 100...