El Chapo came down from the mountains during his time as a fugitive to undergo erectile dysfunction surgery in Tijuana ... according to a Mexican newspaper.
Reforma claims sources close to the investigation told its reporter, Chapo received a testicular implant to improve blood flow ... just a stone's throw from the U.S. border.
The paper claims the surgery required anesthesia and an operating room and involved planting a prosthesis.
The report claims when Chapo was captured authorities found injectable testosterone, syringes, antibiotics and anti-inflammatories.
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