Watch out for Yohimbi. I've personally tried this quite a few times. It ups your heart rate and it could keep you up all night.
One of the scientific study that you can google on is L-Arginine + Yohimbi which has been proven in some people to be one of the most effective herbal combo's out there for ED.
One of the scientific study that you can google on is L-Arginine + Yohimbi which has been proven in some people to be one of the most effective herbal combo's out there for ED.