Estrogen used in hormone replacement therapy can be derived from which sources?

Estrogen used in hormone replacement therapy can be derived from both plant and animal sources. This is significant because phytoestrogens, which are plant-derived, mimic the structure and function of estrogen in the body and are found in various plants such as soy. On the other hand, animal-derived estrogens are often extracted from the urine of pregnant mares and are used in some hormone replacement therapies. The ability to source estrogen from both plants and animals allows for a variety of options in medical treatments, catering to different patient needs based on efficacy, side effects, and personal preferences. This diversification is essential for creating hormone replacement therapies that are effective and well-tolerated by patients.