Glycogen is a form of stored energy in the human body that is found in liver and muscle cells, as explained by Elmhurst College. It is the storage form of glucose, which is utilized in the human body whenever glucose levels are low.
According to Elmhurst College, glycogen is a polysaccharide that is found in high concentrations in the liver and in low concentrations in muscle cells. Whenever glucose levels become low in the body due to poor nutrition or disease, glycogen can be broken down into glucose to help give cells throughout the body energy. The metabolism of glycogen and glucose helps to maintain blood glucose levels in the body.