Replenish the look of stressed skin, with the 111SKIN The Y Theorem Concentrate Serum. The lightweight, fast-absorbing serum is boosted by NAC Y2 complex. This contains collagen, elastin and hyaluronic acid, which work in unison to reduce the look of redness and dryness. A boost of niacinamide offers anti-inflammatory properties, encouraging the illusion of a more even skin-tone. This is emphasised by calendula, allowing the serum to be suitable for sensitive skin. A plumper, firmer aesthetic is promoted, along with the look of fine lines being lessened.