Garlic is used widely as a flavoring in cooking, but it has also been used as a medicine throughout ancient and modern history to prevent and treat a wide range of conditions and diseases. Garlic is widely used for several conditions linked to the blood system and heart. Studies have found that garlic can potentially be a very powerful antibiotic, help protect the heart during cardiac surgery and after a heart attack, lower the risk of developing lung cancer, and reduce high cholesterol and blood pressure levels.