Garlic contains several vitamins and minerals that support heart health, including vitamin B6, vitamin C, manganese, and selenium. But it's the chemicals that give garlic its pungent odor that scientists believe are the source of the herb's heart health-promoting effects. Garlic is rich in the allicin, alliin, and ajoene -- antioxidant compounds that help reduce the risk for cardiovascular disease.
Studies on garlic and the cardiovascular system typically use garlic powder, oil, or aged extracts. To date, the effects of garlic on the heart that are supported by science include:
- Slows the development of atherosclerosis (hardening of the arteries)
- Reduces blood pressure
- Reduces triglycerides and therefore lowers total cholesterol
Generally safe for most adults, taking a garlic supplement can cause heartburn, upset stomach, an allergic reaction, and breath and body odor (common with raw garlic). Garlic should not be taken by persons who are preparing for surgery or who have bleeding disorders because it can impair the body's ability to form blood clots.