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Neurodegenerative diseases can disrupt the normal human homeostasis and result in abnormal estrogen levels. For example, neurodegenerative diseases can cause different physiological effects in males and females. In particular, estrogen studies have revealed complex interactions with neurodegenerative diseases. Estrogen was initially proposed to be a possible treatment for certain types of neurodegenerative diseases but a plethora of harmful side effects such as increased susceptibility to breast cancer and coronary heart disease overshadowed any beneficial outcomes. On the other hand, Estrogen Replacement Therapy has shown some positive effects with postmenopausal women. Estrogen and estrogen-like molecules form a large family of potentially beneficial alternatives that can have dramatic effects on human homeostasis and disease. Subsequently, large-scale efforts were initiated to screen for useful estrogen family molecules. Furthermore, scientists discovered new ways to synthesize estrogen-like compounds that can avoid many side effects.