Laser light uses the scientific principle of photo biotherapy. This process occurs when cells absorb light and repair themselves. Laser light penetrates deep into the tissues of the scalp (it does NOT penetrate bone). Stimulating microcirculation of blood supply. Cell metabolism and protein synthesizers. Clinical studies suggest that this cellular and SUB cellular activity breaks down the collection of DHT (dehydrotestosterone). Helping to stop hair loss. Many long term international clinical research programs have shown that BIO stimulation of 'cold beam' LOW level laser gives numerous positive effects to the skin and hair.