Damiana is an excellent strengthening remedy for the nervous system. It has an ancient reputation as an aphrodisiac. Whilst this may or may not be true, it has a definite tonic action on the central nervous and the hormonal system. The pharmacology of the plant suggest that the alkaloids could have a testosterone-like action (testerone is a male hormone). As a useful anti-depressant, Damiana is considered to be a specific in cases of anxiety and depression where there is a sexual factor. It may be used to strengthen the male sexual system. The New Holistic Herbal by David Hoffmann Pg. 195