A traditional Chinese medicinal root used for centuries may hold real promise for treating common hair loss. Credit: Shutterstock Androgenetic alopecia (AGA) is the most widespread form of hair loss, affecting millions of people around the world. Medications such as finasteride and minoxidil are widely prescribed, but concerns about side effects and long term use have pushed many patients to look for gentler, more holistic approaches. A new scientific review suggests that Polygonum multiflorum ,