High blood pressure (hypertension) is one of the most common chronic conditions in adults. Hypertension strains the heart and harms blood vessels. It increases the risk for blindness, heart attack, heart failure, kidney problems, and stroke. Doctors often use drugs to lower blood pressure in people with hypertension. Diet also may affect blood pressure. For example, some studies show that limiting salt intake can lower blood pressure. Recently, a few small studies have suggested that eating soybean, a plant-based protein, could lower blood pressure. We do not know, however, whether regular dietary supplements of soybean significantly lower blood pressure.