There are many claims made in this area of research, but my own experience is that until any natural herbal remedy has been properly tested in clinical trails you should stay well clear of it. Most recently the is chatter about a group of German researchers working on a plant extract that cures erectile dysfunction which may be available next year! There is only one clinically tested plant extract to-date which is clinically tested and successful for over 80% of all men who take it, that is Butea Superba. Readily available in pill form under the brand name HealthyED, details of the trials can be found www.HealthyED.co.uk  Compared to other tests which indicate Viagra working for around 50% of users HealthyEd with an 84% success rate looks like an attractive alternative to taking prescription drugs.