Just get a prescription and call it a day
However, if it is as simple as only get an erection, put it in, count to three and on to the next one, then I agree. Sometimes the way these herbs react on your system has many components. Some seem to restore an amazing plumpness which is beyond just a rock hard erection.
If this is a hobby, then why not explore the hobby in detail. And it all starts with that special talent between your legs. If he is in superb form, you are in the drivers seat.
As my blessed dear ole' dad used to say, "A craftsman is only as good as his tools."