A hormone produced by beta cells, in the pancreas. After we take food insulin is released in blood and it helps to uptake glucose from food and used as a form of energy. It also provides storage of excess glucose in liver. Insulin has been used in all types of diabetic patients. Insulin needs predominantly depends on the balance of insulin secretion and insulin resistance. Patients with type 1 diabetes requires insulin throughout their life, unless they have an islet or they have done pancreas transplant where as patient with type 2 diabetes require insulin due to the destruction of beta cell function over time