The Gardenia jasminoides species is the most common of these fragile plants and material from dried Gardenia flower petals is commonly used in Chinese herbal medicine. Its Chinese name is zhi zi. The traditional medicinal actions attributed to gardenia include calming irritability; cooling blood and clearing away heat (a yin/yang imbalance often characterized by deficient yin); reducing swelling; and moving stagnant blood that has congealed in one place, usually following trauma. Gardenia is considered to be very effective as a hemostatic agent, which means that it stops bleeding; and also effective in treating injuries to the muscles, joints, and tendons. Gardenia is commonly used in Chinese herbal formulas to treat infections, particularly bladder infections; abscesses; jaundice; and blood in the urine, sputum, or stool. Because of its perceived ability to ease agitation or irritability, gardenia absolute is also used in formulas to treat anxiety or insomnia. It is also helpful in correcting menopausal imbalances.