According to the information from manufacturers and sellers, the ZGTS 540-needle roller is designed to:
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Stimulate collagen and elastin production — the tiny needle pricks cause micro-injuries that trigger the skin’s natural healing response, which can lead to firmer, more youthful-looking skin over time.
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Reduce scars, fine lines, wrinkles, acne marks, stretch marks, and pigmentation — by promoting regeneration and improving skin structure.
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Improve skin texture and elasticity — leading to smoother, more even skin over repeated use.
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Enhance absorption of skincare products — the micro-channels created by the needles allow serums, moisturizers or topical treatments to penetrate deeper into the skin, potentially making them more effective.
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Support hair growth or scalp treatment (in certain versions) — some sellers market it for stimulating hair follicles or improving beard growth, because increased circulation and absorption might benefit scalp/hair health.