Before trying erexpill I tried yohimex, viagra, cialis and a few other supposed erection enhancers and none of these really worked. I've always felt my problems were due to L4-5 spinal chord injury. Erexpill sent me their sample pill and it seemed to work both for libido and actual erection attainment. So I placed an order for five. After a very long wait, I got a packet from them maybe 3-4 weeks ago. The packet contained 8 pills with a note of apology that it took so long and that they were giving me 3 extra pills to make up for the inconvenience. However, I'm not sure I want to try them because there were side effects with the sample pill. I had a low level headache for about 3-4 days that really was not even annoying. But I also got this pain in my chest at one point. Then too, on rare occasion, there was this strange inability to hold my visual fix on objects. I do think they were on to something if only there were no side effects. They do list the ingredients on the pkg but not the formula.