In all, these studies proved that Tribulus works very well in curing sexual dysfunctions and maximizing sexual performance when taken regularly. The man's comfort level is also frequently a factor, especially in maintaining an erection. There are two methods for measuring changes in penile rigidity and circumference during nocturnal erection: snap gauge and strain gauge.
Impotence can be treated — sometimes even without drugs. Given the advances in medicine and nutrition research, however, it is no longer a scary thing. As testosterone and other male sex hormone levels start to drop after reaching middle age, low testosterone level is often the culprit in most intermittent impotence problems, especially in older men.