Glycogen is found in small amounts in human tissue as a temporary source of stored energy. It is not present to any large extend in the foods we eat. When the glucose from carbohydrates enters the muscles and liver, if it is not metabolized for energy, it is synthesized to form glycogen.
2/3 of the glycogen in the body is stored in skeletal muscles; the remaining 1/3 is stored in the liver.
The process of converting glucose to glycogen is called glycogenesis.