Do you mean you have low blood pressure, or you want to lower your blood pressure?
If you have low blood pressure, then you'll want to make sure you're getting adequate salt.
If you have high blood pressure and want to lower it, beet juice has been shown to work quite well, just combine it with another juice as it should not be taken straight. http://www.webmd.com/hypertension-high-blood-pressure/news/20080208/beet-juice-lowers-blood-pressure
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