Overview ITT-5 Mechanisms of Spermatogenesis in Man Status: Withdrawn Trial end date: 2026-12-01 Target enrollment: Participant gender: Summary The purpose of this investigational drug study is to determine how much male hormone, testosterone, is needed to maintain sperm production in the testis. Phase: Phase 2 Details Lead Sponsor: University of WashingtonTreatments: AcylineChorionic GonadotropinDutasterideKetoconazoleMethyltestosteroneTestosteroneTestosterone 17 beta-cypionateTestosterone enanthateTestosterone undecanoate