Hair growth helmets are laser based devices that use low lever laser therapy (LLLT) to stimulate the scalp and hair follicles. The laser energy causes the follicles to expand and thus producing thicker and denser looking hair. Secondly the photons get absorbed in the scalp and promote the blood flow and increase nutrient support. Hair growth helmets work can slow down hair loss in people who are in the starting states of alopecia. You will have to wear the helmet for several months before you see the results. Consult your dermatologist or hair specialist before using a hair regrowth helmet so that he or she can diagnose the specific type of hair loss you are experiencing and recommend the right treatment line.