The HairMax Prima 7 LaserComb is a handheld hair regrowth device that is highly rated on Amazon. It features 7 medical-grade lasers that stimulate hair follicles and promote hair growth. The comb is designed to be used for just 15 minutes, three times a week. It is FDA-cleared and has been clinically tested for safety and effectiveness. The HairMax Prima 7 LaserComb is suitable for both men and women and can be used on all hair types. Users have reported visible improvements in hair thickness and overall hair health after using the device consistently.