Damiana leaf, also known as Turnera diffusa, is a small shrub native to Central and South America. The leaves of the plant are used for medicinal purposes. Damiana leaf has been traditionally used as an aphrodisiac and to help improve sexual function. It's also been traditionally used to help relieve anxiety and to help improve sleep. Damiana leaf is believed to have mild sedative properties and may help to reduce stress and improve mood. It is also believed to have anti-inflammatory properties and may help to reduce pain and inflammation.