When testosterone is given, the need to compensate via increased production of 5α - DHT is
removed; the
androgen receptors are now also being activated by testosterone, resulting in signaling for reduced synthesis of 5α - reductase and / or reduced 5α - reductase activity.41 In sum, the research suggests that testosterone replacement promotes normalization of 5α - reductase activity, 5α - DHT levels and its metabolism to 3β - adiol.