Huanarpo macho contains sapogenins, steroids, flavonoids, ethereal oils, and alkaloids. It is also high in proanthocyanidins which researchers believe to have the ability to correct erectile dysfunction and infertility. Italian researchers have also found rich condensed tannins also reported to stimulate sexual activity and improves fertility. A Peruvian researcher however, attributed the aphrodisiac effect to its alkaloid content. Tests on mice also showed increased testosterone levels.