Milady Esthetics State Board Complete Practice Test 2026

Estrogen used in hormone replacement therapy can indeed be derived from both plants and animals. This is because the active compounds that mimic estrogens in the body can be extracted from plant sources, such as soy and yams, which contain phytoestrogens. Additionally, animal sources are also utilized, particularly in the case of conjugated estrogens that are derived from the urine of pregnant mares.

The use of both sources allows for a variety of estrogen formulations that can address the specific needs of patients undergoing hormone replacement therapy. The blend of these natural and bioidentical hormones caters to different biological responses and treatment preferences, providing flexibility in managing symptoms associated with menopause and other hormonal imbalances.