An<unk>  (from Greek andr-, the stem of the word meaning "man") is any natural or synthetic steroid hormone that regulates the development and maintenance of male characteristics in vertebrates by binding to<unk>  receptors. This includes the embryological development of the primary male sex organs, and the development of male secondary sex characteristics at puberty.<unk> s are synthesized in the testes, the ovaries, and the adrenal glands.<unk> s increase in both males and females during puberty. The major<unk>  in males is testosterone. Dihydrotestosterone (DHT) and androstenedione are of equal importance in male development. DHT in utero causes differentiation of the penis, scrotum and prostate. In adulthood, DHT contributes to balding, prostate growth, and sebaceous gland activity. Although<unk> s are commonly thought of only as male sex hormones, females also have them, but at lower levels: they function in libido and sexual arousal. Also,<unk> s are the precursors to estrogens in both men and women. In addition to their role as natural hormones,<unk> s are used as medications; for information on<unk> s as medications, see the<unk>  replacement therapy and anabolic steroid articles.
Androgen
Estrogen 
Estrogen
Progesterone
Progesterone 
Methyltestosterone
Progestogen 
Progestogen