In humans, glycogen is made and stored primarily in the cells of the liver and skeletal muscle. In the liver, glycogen can make up 5–6% of the organ's fresh weight, and the liver of an adult, weighing 1.5 kg, can store roughly 100–120 grams of glycogen.

What is the source of glycogen?

Glycogen is the reserve polysaccharide in the body and is mainly comprised of hepatic glycogen. Glycogen is synthesized in the liver and muscles. α-D-Glucose combines to form glycogen continuously.

Where does the body get glycogen from?

The molecules, made from glucose in the food you eat, are mainly stored in your liver and muscles. From these storage sites, your body can quickly mobilize glycogen when it needs fuel. What you eat, how often you eat, and your activity level all influence how your body stores and uses glycogen.