The HairMax works via the principle of photo-bio stimulation, a process by which nutrient rich laser energy is delivered to the hair follicle. This process causes a revitalization of the individual follicle, and a general strengthening of the hair.The HairMax LaserComb Premium uses 9 individual laser beams, with each beam emitting the maximum amount of energy necessary to stimulate the hair follicles and effectively cause re-growth.Results of the clinical study showed that virtually all patients using the HairMax demonstrated some degree of hair re-growth from this remarkable, but still not completely understood, process of action.