540 pin DermaRoller
is a small roller about 1.25" wide and is covered with metal needles of about 2-3 mm in length. It is used by rolling the needles over the scalp, gently puncturing the outer layers of skin. I noticed greatly increased
hair growth after I started using a Dermaroller in conjunction with topical Minoxidil. There are many anecdotal reports that
skin needling does work for hair loss. Studies have shown a remarkable increase in absorption of medications after needling.
You can purchase the 192 pin version that many users report as being better at Amazon for about $15. Dermarolling appears to be an excellent treatment.
A study in 2009 concluded that .5mm Dermarollers were optimal in increasing the absorbtion of topical medications.