As we speak, there are about 30 million women in the United States who are experiencing hair loss and thinning as caused by genetics — yet the topic remains taboo. So this week, Jenny and Dianna called in dermatologist Nazanin Saedi to investigate the different causes of hair loss and review the many treatment options available — while getting real about the costs.

This episode of Allure: The Science of Beauty is presented by Head & Shoulders.

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