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Give your skin a silky soft and glowing appearance with collagen-based Collagène Natif serum. Collagen is an excellent firming agent and is known to tighten the pores and improve the contour of the face. Biologique Recherche Serum Collagen can also be used as an eye mask! Simply separate a cotton pad, lightly saturate each piece with serum and leave on for 15 minutes. It works like a booster and can be great for an instant pick-me-up.