VITROMAN potent herb content effects by increment of smooth muscles relaxation or vasodilation, and increase of blood flow to the private part also called Cyclic Guanosine Monophosphate (cGMP). Fact: For men who have trouble lifting his private part on its own, it is caused by Phosphodiesterase-5 (PDE 5). PDE 5 enzymes break down the cGMP. In the case of PDE 5 levels supercede the declining cGMP levels, as the private part at an upright position return to the flaccid sate. That is why holding and maintaining his private part at an upright position can be difficult for some men. The natural compound in the VITROMAN therefore effectively block out the PDE 5 enzymes, prolong manhood upright position time and better holding power.