A derma roller for hair is a microneedling tool designed to promote hair growth and improve scalp health. It features a handle with a roller covered in tiny needles, typically ranging from 0.5mm to 1.5mm in length. When rolled over the scalp, it creates micro-injuries that stimulate blood circulation, increase collagen production, and enhance the absorption of hair growth products like minoxidil, serums, or essential oils.

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