yohimbe= herb= many other things you dont want that cause side effects.. even though it "supposed to be a standardized extract " sometimes with little of what you do want
yohimbine hcl=
thats pretty much the simplest way to put it.
if all you have access to is yohimbe.. it will help, but it also tends to cause more CNS and cardio problems.. as well as the occasional allergic reaction