Could A Scalp-Zapping Cap Help Reverse Male Balding?

"An electric patch makes hairless mice grow fur and may reverse balding in men when fitted inside a specially designed baseball cap," reports New Scientist:

At the moment, men who don't want to go bald can treat hair loss using minoxidil lotion, finasteride pills or hair transplant surgery. But minoxidil doesn't work for everyone, finasteride can reduce sex drive and fertility, and surgery is painful and expensive. Stimulating the scalp with electric pulses has also been shown to restore hair growth. However, it isn't a very practical treatment because it involves being hooked up to a machine or battery pack for several hours a day.

To overcome this hurdle, Xudong Wang at the University of Wisconsin-Madison and his colleagues have developed a wireless patch that sticks to the scalp and generates electric pulses by harnessing energy from random body movements. The 1-millimetre-thick plastic patch contains layers of differently-charged materials that produce electricity when they come into contact and separate again -- a phenomenon known as the triboelectric effect. When the flexible patch was attached to the backs of rats, their movements caused it to bend and stretch, activating the triboelectric effect. The resulting electric pulses stimulated faster hair re-growth in shaved rats compared with minoxidil lotion and inert saline solution...

Wang also tested the patch on his father, who has been going bald for the past few years. "It helped him to grow a lot of new hairs after one month," Wang says. His team has now designed a baseball cap that encases the whole scalp in the triboelectric materials to stimulate hair growth, and is seeking approval to test it in men in a clinical trial... However, the hat will only work in men who are currently losing their hair or have recently become bald, because the skin loses its ability to generate new hair follicles after many years of baldness, Wang says.