Derma rollers, equipped with micro-needles, stimulate hair growth by creating micro-injuries on the scalp, boosting blood ...

According to PubMed, derma rollers help promote hair growth as it stimulates hair and is useful to treat hair loss. It is advisable to consult a dermatologist before using a derma roller.

The process can be done at home or in-office and involves using a device with lots of little needles to puncture the skin to increase collagen production and help skin care ingredients sink in deeper.