This trial has been prepared to prove the effect of Lepidium meyenii (maca) over the hormonal pattern, sexual behavior and erectile function; physical well-being and reaction to stress; red corpuscles and nutritional state for a healthy human being.
The trial took a sample of males between 20 and 40 years old. The men were placed in placebo and Maca groups according to the treatment received. The trial was prospective and double blind. The trial was carried out between December 2000 and May 2001 by researchers of Universidad Peruana Cayetano Heredia (Peruvian University Cayetano Heredia), department of Sciences and Philosophy and Instituto de Investigaciones de la Altura (Institute of Highlands Researches). The principal researcher was Dr. Gustavo Gonzales, the associate researchers were Amanda Cordova, Arturo Chung, Arturo Villena, Carmen Goñez, Karla Vega, Julio Rubio, Manuel Gasco, Carla Gonzales, Sharon Castillo and Diana Garayar.
The primary conclusions resulting from the trial are: