Is one of the few herbs that actually deserves the title “herbal Viagra”, Xanthoparmelia Scabrosa increases libido and arousal level, extends and strengthens erections, increases sensation of orgasms, and increases blood flow by inducing smooth muscle relaxation in the penis.  The active ingredients in Xanthoparmelia Scabrosa are 4-Methylpiperazine and Pyrazolo Pyrimidin-7-1 which are known to be Phosphodiesterase-V (PDE-5) inhibitors.