A number of holistic and complementary medical doctors in the US, from general practitioners to psychiatrists, are using maca with a variety of patients. Both men and women report a significant boost in libido. And a number of men who have suffered from erectile dysfunction have improved, as a result of taking maca.
Chris Kilham (2013). “Hot Plants: Nature's Proven Sex Boosters for Men and Women”, p.160, St. Martin's Griffin