Leydig cells are specialized cells located in the testes, specifically in the interstitial tissue between the seminiferous tubules. They play a crucial role in male reproductive health by producing testosterone, the primary male sex hormone. This hormone is essential for the development of male secondary sexual characteristics, such as facial hair and a deeper voice, as well as for regulating sperm production. In addition to testosterone production, Leydig cells respond to signals from luteinizing hormone (LH), which is released by the pituitary gland. The activity of Leydig cells is vital for maintaining male fertility and overall hormonal balance in the body.