This is an ancient technique and works similar to reflexology—through energy channels. When you rub fingernails briskly against each other, for about 10 minutes every day, it stimulates hair growth and makes your hair healthy and strong.You will find anecdotal claims to support the benefits, and there are many proponents and followers of this ancient practice. Some have even claimed hair re-growth on bald areas. 

http://windsofwinter.org/folliclerx-supplement-review/