Which hormone stimulates the interstitial cells of the testicles to produce testosterone?

The hypothalamus produces gonadotropin-releasing hormone (GnRH), which in turn prompts the anterior pituitary gland to release luteinizing hormone (LH). LH stimulates the interstitial cells of the testicles, also known as Leydig cells, to produce testosterone. Estrogen in males is important for regulating spermatogenesis, libido, and erectile function. Follicle-stimulating hormone in males regulates sperm production. Growth hormone stimulates growth in all organs and is not associated with the production of testosterone in males.