The primary role of insulin in the body is to regulate blood glucose levels. Produced by the pancreas, insulin facilitates the uptake of glucose by cells for energy or storage as glycogen in the liver and muscles. This hormone plays a critical role in maintaining homeostasis, ensuring that cells have a consistent source of energy while preventing the detrimental effects of high blood sugar levels. Insulin’s function is vital for conditions like diabetes, where insulin production or action is impaired.