As the name suggests, this is a procedure that involves the application of low level – think low energy – light rays to stop the progress of receding hairlines and even stimulate the growth of new healthy hair. The LLLT method was accidentally discovered by Endre Mester, a Hungarian physician while trying to treat tumors in mice. He noticed while the tumor remained unchanged that it’s growing back faster on the chemotherapy-induced alopecia parts than on the non-treated areas.