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For people with elevated blood pressure, garlic supplements can help, according to a review of 17 human trials that was published in the Journal of Clinical Hypertension. In the studies, people with high blood pressure took different types of garlic supplements, including aged garlic extract (AGE). On average, systolic blood pressure (the top number) dropped by 3.75 mmHg and diastolic blood pressure by 3.39 mmHg. In addition, garlic reduced cholesterol by 5.4 percent and triglycerides by 6.5 percent. Such improvements contribute significantly to better health.