Premature ejaculation is often caused by low serotonin levels and raising serotonin levels can help premature ejaculation. The supplement 5-HTP (a precursor to serotonin) help in this regard. Take 100mg every morning on an empty stomach. It is fast acting and within as shortly as a few days you should start noticing a difference, as well as other positive benefits such as better mood and sleep. My only potential warning is that the first day or two you may feel much more emotional than you otherwise would be.