Breast development extension adrenocorticotropic hormone (ACTH)), and thyroid hormones such as thyroxine (and by extension thyroid-stimulating hormone (TSH) and thyrotropin-releasing hormone (TRH)) also play permissive but less well-understood/poorly-characterized roles in breast development during both puberty and pregnancy, and are required for full functional development. Leptin has also been found to be an important factor in mammary gland development, and has been found to promote mammary epithelial cell proliferation. In contrast to the female-associated sex hormones, estrogen and progesterone, the male-associated sex hormones, the androgens, such as testosterone and dihydrotestosterone (DHT), powerfully suppress the action of estrogen in the breasts. At least one
Transgender hormone therapy about their care, whether they wish to take the NHS or private route without putting their health and indeed their lives in danger." Self-administration of hormone replacement medications may have untoward health effects and risks. Transgender hormone therapy Transgender hormone therapy, also sometimes called cross-sex hormone therapy, is a form of hormone replacement therapy (HRT) in which sex hormones and other hormonal medications are administered to transgender or gender nonconforming individuals for the purpose of more closely aligning their secondary sexual characteristics with their gender identity. This form of HRT is given as one of two types, based on whether