Also called Allium sativum.
In a meta-analysis of seven randomized controlled trials of garlic supplements, three trials showed a significant reduction in systolic blood pressure and four in diastolic blood pressure. Researchers concluded that garlic powder supplement may be of clinical use in patients with mild high blood pressure.
Garlic supplements should only be used under the supervision of a qualified health practitioner. Garlic can thin the blood (reduce the ability of blood to clot) similar to aspirin. Garlic may interact with many drugs and supplements such as the prescription "blood-thinners" drugs such as Coumadin (warfarin) or Trental (pentoxifylline), aspirin, vitamin E, gingko. It is usually recommended that people taking garlic stop in the weeks before and after any type of surgery.