Garlic has been used for hardening of the arteries (atherosclerosis) and high blood pressure (hypertension). Consult your doctor for more information if you have heart disease or high blood pressure.Garlic has also been used to prevent tick bites.arlic has been used for hardening of the arteries (atherosclerosis) and high blood pressure (hypertension). Consult your doctor for more information if you have heart disease or high blood pressure.