If you're looking to lower your blood pressure with garlic, you'll need to be patient. It takes about four weeks of consuming aged garlic daily to see a decrease in blood pressure, according to a study published in the Journal of Nutrition.
The study looked at the effects of aged garlic extract on blood pressure in rats. After four weeks, the rats that were given the garlic had significantly lower systolic and diastolic blood pressure than those that didn't receive it. Researchers believe that the antioxidants in garlic are responsible for its ability to lower blood pressure.
If you're interested in trying aged garlic to lower your blood pressure, talk to your doctor first. While it's generally safe, there is a small risk of bleeding when taking garlic supplements.