The THC-induced block of GnRH release results in lowered LH and FSH which is responsible for reduced testosterone production by the Leydig cells of the testis. Other hormones that might have a synergistic or antagonistic effect upon reproduction in the male are the adrenal cortical hormones, prolactin, thyroid hormones, and growth hormones. THC appears to depress prolactin, thyroid gland function, and growth hormone while elevating adrenal cortical steroids.
Endocrine effects of marijuana in the male: preclinical studies. - PubMed - NCBI
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