Estrone acetate (Hogival) is an estrogen derivative and an estrogen receptor (ER) activator. It promotes mammary gland development, stimulates pituitary prolactin secretion, and induces the proliferation and activation of lactotrophs (e.g., by reducing prolactin storage granule size while increasing rough endoplasmic reticulum and Golgi apparatus volume density) . Estrone acetate holds potential for endocrine research, particularly in studying estrogen's effects on pituitary function, prolactin regulation, and mammary tumor models[1].