At least according to the FDA...
http://pagingdrgupta.blogs.cnn.com/2010/12/13/fda-warns-consumers-to-avoid-sexual-enhancement-pills/?hpt=Sbin
http://pagingdrgupta.blogs.cnn.com/2010/12/13/fda-warns-consumers-to-avoid-sexual-enhancement-pills/?hpt=Sbin