May help the cardiovascular system. altough heart disease should only be treated under strict medical supervision hawthorn juice is an exceptionally well tolerated & safe tonic. It helps to relax muscular tension improve blood flow & may help to regulate blood pressure. Hawthorn juice has been traditionally used by people with a reduced cardiac function, athletes who need an energy boost & those who suffer from chronic fatigue. Hawthorn juice exerts a beneficial effect on the function of the heart by increasing the circulation in the blood vessels strengthening the heart & reducing blood pressure.