Dihydrotestosterone is a potent androgen hormone derived from testosterone that regulates development and maintenance of androgen-sensitive tissues. It plays a major role in development of external male genitalia, prostate physiology, body hair growth, sebaceous gland activity, and androgen-dependent tissue differentiation. DHT binds androgen receptors with greater affinity than testosterone and produces stronger transcriptional activation in many target tissues.
The hormone contributes to male-pattern body hair distribution, beard growth, prostate development, skin oil production, and maturation of androgen-responsive tissues during puberty. DHT also participates in reproductive tissue signaling and influences local tissue growth through regulation of androgen-responsive genes involved in cellular differentiation and structural development.
DHT is produced from testosterone through activity of the enzyme 5-alpha-reductase. Two major isoforms of this enzyme are expressed in tissues including skin, prostate, liver, reproductive tissues, and hair follicles. Testosterone entering these tissues may be rapidly converted into DHT, allowing strong local androgen receptor activation.
Because DHT is formed within target tissues rather than primarily secreted from endocrine glands, its biological effects depend heavily on local enzyme activity and androgen receptor expression. Once formed, DHT binds intracellular androgen receptors and regulates transcription of androgen-responsive genes involved in growth, differentiation, and tissue maintenance.
DHT production depends mainly on testosterone availability and expression of 5-alpha-reductase enzymes within androgen-sensitive tissues. The hypothalamic-pituitary-gonadal axis indirectly regulates DHT through control of testosterone production. Nutritional state, insulin signaling, inflammatory pathways, aging, and tissue-specific enzyme activity can influence conversion efficiency.
DHT signaling occurs through androgen receptor activation, which alters transcription of genes involved in reproductive tissue development, sebaceous gland activity, follicular biology, and structural tissue differentiation. Aromatase does not convert DHT into estrogens, making DHT a highly androgen-specific signaling hormone. Regulation of DHT therefore reflects integration of endocrine androgen production with local tissue-specific steroid metabolism and receptor responsiveness.
DHT is a high-affinity androgen formed from testosterone in target tissues, activating AR-dependent gene programs for androgenic development and function.
