Polygonum multiflorum, also known as Fo-Ti or He Shou Wu, is a species of perennial plant in the buckwheat family Polygonaceae. The plant is native to China and is widely used in traditional Chinese medicine.
 
Polygonum multiflorum has a long history of use in traditional medicine for a variety of purposes, including improving liver and kidney function, promoting hair growth, and boosting the immune system. The plant is also believed to have anti-aging properties and is commonly used as a tonic to promote overall health and longevity.
 
One of the most well-known uses of Polygonum multiflorum is for its purported ability to promote hair growth and reverse hair loss. The plant is believed to improve blood circulation to the scalp and stimulate the production of hair follicles, leading to thicker and fuller hair.

In addition, Polygonum multiflorum is thought to have antioxidant properties that protect hair follicles from damage caused by free radicals.