Jun 4, 2026
Testosterone replacement therapy suppresses sperm production in the majority of men, often to levels incompatible with natural conception. This effect is caused by the suppression of the hypothalamic-pituitary-gonadal (HPG) axis: exogenous testosterone shuts down the FSH and LH signals that drive spermatogenesis in the testes. The suppression is typically reversible after stopping TRT, but recovery […]