This area of endocrinology explores the latest discoveries and innovations related to reproductive hormones, including estrogen, progesterone, testosterone, LH, FSH, and GnRH. Research in this field focuses on understanding hormonal regulation of fertility, puberty, menstrual cycles, menopause, and reproductive disorders like PCOS and hypogonadism. Advances in hormone replacement therapy, assisted reproductive technologies, and endocrine disruptor impact studies are transforming clinical approaches. With growing precision in hormone assays and personalized endocrine treatments, this field plays a crucial role in reproductive health management and fertility science.