Eucommia: This tree native to China is at risk of extinction; today it is found almost exclusively in cultivated form. It use is very ancient; it is mentioned in Chinese herbal texts dating back 2,500 years. It is also used in the west to regulate arterial pressure. -Olive: This is a fruit tree, which was first used by the Ancient Greeks as a food. Olives, the fruits, are used for extracting olive oil and, to a lesser extent, used directly in food. The leaves of this plant are rich in oleuropein and are used to regulate arterial pressure. -Hawthorn: With white flowers and red berries, hawthorn contains flavonoids, including hyperoside, and antioxidants. Its actions in regulating cardiovascular function and arterial pressure have been known for a long time, in fact, it used to be called the ‘heart plant’. -Hibiscus: The genus Hibiscus contains various species, many of which are used in italy as ornamental plants. It contains organic acids, mineral salts, ascorbic acid and mucilages. It has various functions: it improves the drainage of fluids and helps to regulate arterial pressure.