Luteinizing hormone (LH) is a hormone produced by the pituitary gland that plays a crucial role in reproduction. Synonyms for LH include interstitial cell-stimulating hormone, follicle-stimulating hormone, interstitial cell-stimulating hormone, lutropin, lutrophin, and gonadotropin-releasing hormone (GnRH). These terms refer to the same hormone and are often used interchangeably in scientific literature. LH is essential for ovulation in females, as it triggers the release of an egg from the ovary. In males, LH stimulates the production of testosterone, which is necessary for the development of masculine characteristics, such as a deep voice and facial hair. Overall, LH is a vital hormone that contributes significantly to reproductive health in both males and females.