Revitalizes the scalp's natural regeneration process Stimulates protein production and cell growth responsible for new hair growth Increases blood circulation in the scalp and nutrients to the follicles Safe and painless The Micro Needle Hair Regrowth Roller is designed for professional home use to control hair loss and regrowth by stimulating the body's wound healing response. Which stimulates protein production to regenerate new hair follicles. How to use : Step 1: Sterilize the roller in an alcohol solution before and after each use Step 2: Wash and dry the hair Step 3: Click. Roll back and forth on the desired area for 4 - 5 times. switch direction Step 4: Apply scalp serum after use if needed Step 5: Use 1-2 times a week.