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Discover The INKEY List Collagen Booster Serum, a face serum that tightens the skin and targets fine lines and wrinkles. Collagen is a natural skin protein that helps to support skin firmness, suppleness and elasticity. As we get older, natural collagen production begins to slow, the skin loses its plumpness and lines and wrinkles begin to appear. THE INKEY LIST Collagen Booster uses Matrixyl 3000, a peptide that mimics the effect of what natural collagen would do to your skin, making it look plumper and smoother. It also helps to boost collagen production resulting in skin that looks firmer and more supple.