Icariin has many great qualities and benefits and is quickly becoming very popular in the supplement industry (with good cause) due to its effectiveness. Said to exhibit PDE-5 inhibition at about 10% that of Viagra it is widely used as an effective supplement for erectile dysfunction. In terms of performance it is known to be a testosterone mimetic so it finds its way into many of todays leading testosterone boosters and pre-workout formulas. It also is an effective vasodialator which helps feed the muscles vital nutrients and hormones while working out. Others just simply claim to feel better while taking icariin and experience a great sense of well being. If you are looking for better performance in the bedroom, the gym or both, icariin is a "must have" supplement.