Insulin is available in a variety of strengths – commonly referred to as U100 or U40 A "U" is a unit The numbers 40 or 100 refer to how much insulin (the number of units) is in a set volume of fluid – which in this case is one milliliter For example, U100 has 100 units per milliliter and U40 has 40 units per milliliterShortacting (regular) insulin is also available in U500 This is five times more concentrated than U100 regular insulin Longacting insulin (glargine) is also available in U300 This is three times more concentrated than U100 longacting insulin Be sure to check the concentration of your insulin so you take the right amountOfficially, one unit is defined at the biological equivalent of 347 micrograms of pure crystalline insulin, a measure that comes from the dawn of insulin, and just happens to be the amount required to induce hypoglycemia in a
Insulin
