Hormone use refers to the utilization of hormones, which are chemical substances produced by the body's endocrine glands. Hormones play a crucial role in regulating various bodily functions such as metabolism, growth, and reproduction. Hormone use can be both natural, as in the case of hormone replacement therapy for menopause or testosterone replacement therapy for hypogonadism, or synthetic, as in the case of contraceptives or performance-enhancing drugs. Research in this area focuses on understanding the effects of hormone use on health and well-being, as well as developing new hormone-based therapies for various medical conditions.