The hawthorn belongs to a large family of shrubs and trees that cultivated in Europe, Asia and North America. The leaves, the flowers and the fruits are used. In modern herbal medicine the dried leaves and flowers of hawthorn are used primarily against heart and circulatory problems. Many clinical studies are conducted in recent years and confirm the properties of this herb. The consumption of hawthorn improves the circulation of blood to the heart significantly. The Procyanidins, especially catechin and epicatechin which are contained in the leaves, slow down the heartbeat.