HDL (high density lipoprotein) cholesterol, also known as high density lipoprotein, is a type of blood fat, which is transported bound to proteins in plasma. As a result, it is largely made up of proteins, cholesterol, and small amounts of triglycerides. HDL cholesterol is also called “good” cholesterol because it removes excess cholesterol (which is not taken up by cells) as well as cholesterol deposits in and around the vessel wall. Excess cholesterol and its accumulations are transported to the liver, where some of them are excreted with the bile. In this way, HDL cholesterol helps clean the walls of blood vessels and also protects our body from atherosclerosis.