What is the difference between U40 and U100 insulin and syringes?U40 syringe B this is because U100 insulin is pure insulin, while U40 is diluted with water ie, U40 is 40% insulin and 60% water, so the water adds more volume to the insulin, making it look like more A unit of U100 is one unit of insulin, and a unit of U40 is one unit of insulin with 60% more water added to it both are still only one units per 1/2 cc OR 50 units per 1/2 cc 10 units per 1/4 cc OR 25 units per 1/4 cc (Keep in mind that 1cc = 1 ml) This number of UNITS that the insulin is marked for is essential for the syringe to draw up the correct quantity of insulin Insulin U40 must be used in U40 syringes U100 insulin needs to be used in U100 syringes
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