A "best derma roller for hair growth" is a device with tiny needles used to create micro-injuries on the scalp, promoting hair growth. An example is the 540 titanium microneedle derma roller, designed to stimulate hair follicles and enhance hair density.
Derma rollers for hair growth have gained prominence as they promote increased blood flow, stimulate collagen production, and create channels for topical treatments to penetrate deeper into the scalp. Historically, derma rolling has been used in cosmetic procedures for skin rejuvenation and in medical settings to treat scars and stretch marks.