Can you tell me natural viagra (sildenafil) or cialis supplement?

Tell you what?: Cialis (tadalafil) is a prescription medication, not a supplement. It is not available as less expensive generic. In fact, all the PDE-5 inhibitor class of drugs are by brand name only. Avoid online/overseas pharmacies b/c there's no guarantee that you'll get what you paid for. Avoid herbs & dietary supplements as manufacturers are not required to prove efficacy & safety, unlike OTC & prescription