Biologically identical hormones are derived from plants, such as the wild yam or soybean plant, and are chemically and functionally identical to human hormones. The wild yam is rich in precursor molecules that can be converted in the laboratory into estrogens and other hormones whose molecular structure is the same as those produced in the human body. Bio-identical hormones used in BHRT include estradiol, estrone, estriol, progesterone and testosterone, DHEA and androstenedione. Biologically identical hormones are believed to produce the same physiologic responses in the body as endogenous hormones (those made by the body).
Substances that are most similar to what our body produces naturally are thought to support human functioning without increased risk of allergic reactions and sensitivities. Moreover, an often over-looked aspect of biologically identical HRT is that it may vastly improve the quality of life for women suffering from a wide range of physical, mental, and emotional symptoms. Biologically identical hormones can be prepared by a compounding pharmacy in dosages and various administration forms to suit each individual patients.