Garlic is the edible bulb from a plant in the lily family. It was traditionally used for health purposes by people in many parts of the world, including the Egyptians, Greeks, Romans, Chinese, and Japanese. Currently, garlic is most commonly promoted as a dietary supplement for conditions related to the heart and blood vessels, including high blood cholesterol and high blood pressure. Fresh garlic, garlic powder, and garlic oil are used to flavor foods. Garlic may be used topically (applied to the skin). How Much Do We Know? A great deal of research has been done on garlic, especially on garlic’s effect on high blood lipid levels (hyperlipidemia) and high blood pressure (hypertension). What Have We Learned? While there’s conflicting evidence, the most reliable results suggest that taking garlic supplements may reduce total cholesterol and low-density lipoprotein (LDL) cholesterol levels in people with high levels of these blood lipids. If …