When you look at the nutrition facts associated with garlic you are mostly going to see zeros – 0 fat, 0 cholesterol, 0 fiber, and so on. So how exactly can garlic lower cholesterol? It’s all about the active sulfur compound in it called allicin. It is suggested that allicin can protect against atherosclerosis, or the narrowing of artery walls due to plaque buildup. Related to the onion and leek, garlic can be consumed in the raw, cooked with food, or taken as a supplement. Always talk to your doctor prior to taking a garlic supplement as over-consuming has been shown to affect blood clotting and liver function.