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      Collagen

      These protein fibres provide structural support to skin, keeping it firm and strong. Collagen naturally breaks down over time (UV damage speeds that process along), and there’s no evidence that topical collagen application can stimulate new production (although ingredients like retinol can).
      Fact checked by Dr Shyamalar Gunatheesan, Consultant Dermatologist BMedSc, MBBS, FACD