Syringes for insulin users are designed for standard U-100 insulin. The dilution of insulin is such that 1 ml of insulin fluid has 100 standard "units" of insulin. Since insulin vials are typically 10 ml, each vial has 1000 units.
Insulin syringes are made specifically for self injections and have friendly features:

    · shorter needles, as insulin injections are subcutaneous (under the skin) rather than intramuscular,

    · finer gauge needles, for less pain, and

    · markings in insulin units to simplify drawing a measured dose of insulin.

    · low dead space to reduce complications caused by improper drawing order of different insulin strengths.