Manufacturer: Eli Lilly Humulin Kwikpen N 5x3ml is a disposable single-patient-use prefilled pen containing 300 units of HUMULIN N. It is a mixture of 70% intermediate-acting insulin and 30% short-acting insulin. It starts to work as quickly as regular insulin but last longer. This insulin product works by helping blood sugar (glucose) get into cells so your body can use it for energy. Features: -You can give yourself more than 1 dose from the pen. Each turn (click) of the Dose Knob dials 1 unit of Insulin. from 1 to 60 units in a single injection. -This product may be used alone or with other oral diabetes drugs (such as metformin). NOTE: We recommend that all insulin products should be shipped Next Business Day. Free shipping on orders over $100 is for Standard shipping only.