Insulin is not a type of blood, it is a hormone. In the body, insulin is a hormone that is produced by the pancreas in order to regulate the level of blood sugar in the system. By contrast, blood is a type of body tissue made up of both cells and plasma, which is a type of body fluid. There is no doubt that blood plays an important role in the body, transporting oxygen and nutrients to the cells, removing waste products from the body, as well as playing a crucial role in the immune system as well as in blood clotting. Despite the fact that insulin is transported through the bloodstream to reach its target cells, it is not a type of blood in its own right.