What is synthetic estrogen made with?

Synthetic estrogen is typically made from chemical compounds that mimic the structure and function of natural estrogens. Common sources include the modification of plant-derived compounds, such as phytoestrogens from soy, as well as the synthesis of molecules like ethinyl estradiol and estradiol valerate in laboratories. These synthetic forms are designed to enhance stability and potency for use in hormone replacement therapy and contraceptives.