What is Damiana Leaf?
Damiana leaf powder comes from the leaves of the Turnera Diffusa plant, which is native to Mexico and Central America. It was traditionally used as an physical tonic in Central America with historical roots tracing back to the Mayans. Damiana contains numerous compounds, some of which include apigenin, caffeine, damianin, eucalyptol, luteolin, tannins, and many more.
Damiana Leaf Benefits
Damiana leaf has mood boosting and relaxation promoting benefits. This is most likely due to the apigenin content in Damiana leaf powder.  Apigenin is a bioflavonoid known to boost mood and promote relaxation.  The relaxing effects are only present in high doses of apigenin, so normal doses should not cause relaxation.  The same holds true for Damiana. 
Damiana Leaf Dosage
The recommended dosage for is 2g per day. This is about two 5cc scoops.
CAS Number: 977000-85-3
Synonyms: Turnera diffusa, Tunera Aphrodisiaca