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Every skin type can see and feel softer and smoother skin with this lightweight, oil-free serum. C-Serum®, short for cytoserum, is our special seaweed Laminaria Digitata filtrate, seaweed extract rich in vitamins, minerals, amino acids, trace elements, phlorotannins, and antioxidants. C-Serum® is the first step of our world-renown Four Layer Facial® — a must have for more luminous skin! See results as long as you are using this product daily. For All Skin Types Best Seller! “It has been my secret for perfect skin since 1980!” — Lydia Sarfati Use daily alone or under your moisturizer.