Derma Roller 540 Titanium Needle (0.5mm)Product Description Clinical research on using the derma roller for hair loss. Research has shown that the derma roller is effective in helping to repair hair loss, both with and without minoxidil. The derma roller causes micro injury to the skin, which triggers a wound healing response Use a shorter needle length derma roller (0. 2mm 0. 5mm) several times a week to enhance absorption of hair serum cosmoderm hair loss treatment. Top Micro Needling