We also found out that using a micro needle roller for your hair is not a new thing. It is an original tool for healing acne scars in dermatology. Derma Rolling Bald Spots for Growth + 5 Off and Free A derma roller can also stimulate cell turnover and improve scalp circulation, which provides a healthier environment for robust hair growth. Derma roller hair growth . Such dermarollers for hair growth are the most effective. The hormone called human growth factor is very essential in producing healthy hair cells. This handheld device has 540 small surgical needles 1.5mm in length. Derma rolling for hair growth can sometimes make your scalp dry. If you are currently using minoxidil (rogaine or other generic version), it would definitely be worthwhile using the roller to improve your results (based on the study results provided above). Experts believe that your body reacts to the several tiny wounds that your dermaroller creates. How a derma roller stimulates facial h...