Used to make the outer lining of your body’s cells and in the manufacturing of vitamin D, cholesterol is a waxy substance produced by the liver. It’s also found in the food you eat. Cholesterol is carried in your blood attached to the proteins. Three major types of cholesterol are found in your blood: low-density cholesterol (LDL), triglycerides (TG), and high-density cholesterol (HDL). LDL is considered to be the “bad” cholesterol because it transports the cholesterol through the blood and leaves deposits of LDL on the artery walls. HDL is considered to be the “good” cholesterol. It’s the “scrubber,” going around and picking up the excess LDL cholesterol and taking it back to the liver.