VLDL Cholesterol (very low density lipoprotein) is a lipoprotein subclass assembled in the liver from cholesterol and apolipoproteins. It is then converted in the bloodstream to low density lipoprotein (LDL). VLDL is prone to accelerate atherosclerosis, and is elevated in a number of diseases and metabolic states. It is composed mostly of cholesterol, with little protein. VLDL (and LDL) is often called "bad cholesterol" because it deposits cholesterol on your artery walls. VLDL transports endogenous triglycerides, phospholipids, cholesterol and cholesteryl esters. It functions as the body's internal transport mechanism for lipids.