This herb is used in treating angina, irregular heartbeat, and Raynaud's disease. Hawthorn's medical properties are cardiac, diuretic, astringent, and tonic. A great deal of scientific study has validated hawthorn's benefits to the cardiovascular system. This traditional European herb dilates coronary arteries, improves oxygenation and energy metabolism in the heart, and decreases lactic acid. Hawthorn has the ability to normalize blood pressure, lowering high and restoring low blood pressures.