Cholesterol is a lipid that is transported in the blood using different types of lipoproteins. There are three types of lipoproteins that are differentiated based on their density. Very low-density lipoprotein, low density protein and high density lipoprotein are the three most common types. These lipoproteins use the process of endocytosis to form vesicles that allow the transport of the hydrophobic lipids throughout the blood.