Insulin therapy is a form of treatment that is used to treat diabetes in people. The primary goal of insulin treatment is to maintain the blood sugar level in your body. Insulin is a hormone produced by the pancreas that helps the body to consume sugar from the carbohydrates in the food that we eat, and store the same for future use. People suffering from diabetes cannot make insulin because the cells in their pancreas are damaged and destroyed. These people require insulin treatment to allow their body to process the glucose. Insulin acts like a key in these cases that unlocks the cells in the body to let in the glucose so that it can be used for energy. There are four different types of insulin. Rapid-acting insulin starts working within few minutes and effect lasts for over 2 hours. Short-acting insulin starts working in 30 minutes and effect lasts from 3 to 6 hours. Intermediate-acting insulin begins working from 2 to 4 hours and effect lasts for about 18 hours. Finally, the long-acting insulin: continues working throughout the day. Cost of different types of insulin is different. Which type of insulin treatment is best suited for you, is something that your doctor or an endocrinologist will decide. Insulin can be taken using a syringe or injection pen or insulin pumps. Apart from arresting the blood sugar levels, insulin treatment can also help you to avoid health problems like heart attack, stroke, kidney disease, nerve problems and even blindness.