The NutraStim Professional Hair Growth Laser Comb is a handheld device that uses laser technology to stimulate hair follicles and promote regrowth. It is FDA-cleared and has been clinically proven to increase hair density and improve hair thickness. The comb design allows for easy and targeted application to the scalp. The NutraStim Professional Hair Growth Laser Comb is a popular choice for those looking for a portable and effective solution for hair regrowth.