I sell per cartridge. One cartridge is 3 ml which has 300 iu of insulin isophane. I have a very limited amount per month.
Humulin N (insulin isophane) is an intermediate-acting insulin given to help control blood sugar levels in people with diabetes. It is used by injection under the skin once to twice a day. Onset of effects is typically in 90 minutes and they last for 24 hours. Insulin is a hormone that works by lowering levels of glucose (sugar) in the blood.