What are the best herbal supplements to help with impotence?

Yohimbe: First, be aware that all dietary supplements & herbs are manufactured w/o proof of safety or efficacy. This doesn't mean they're dangerous & don't work, just that the manufacturers don't have to prove anything, unlike prescription medications. Batch-to-batch variation is also problematic, so you may have more or less from bottle to bottle. With all that said, you might consider yohimbe.