Ouassim Oumaiz, Spanish 5,000m champion, positive in an anti-doping control. GHRP-2, the growth hormone found in the urine of the Malaga athlete, is not invisible.
The myth about its invisibility, its magnificent effects on converting fat into muscle and the ease with which it can be purchased online make it so popular. Six cyclists, including the Spanish Samuel Sánchez, tested positive for the hormone and were banned for four years.