Gliss Serum Repair Treatment Serum from Schwarzkopf. Thin, worn and rough hair needs one thing: an extra dose of proper nutrition and care. But to work, treatments must penetrate deep into the hair roots. Gliss’ new haircare line Serum Deep Repair does just that, thanks to innovative technology and an aminoprotein-serum. The key component is the combination of amino acid and proteins in the formula, which are natural ingredients in the hair. Worn, damaged hair loses these natural building blocks and the Gliss Serum Deep Repair series is designed to replace them and fill in gaps in hair's structure. The serum can penetrate up to ten hair strand layers and transform the tired and rough hair into a soft and silky smooth texture in just one week. 200 ml Color: White Material: Unknown Sizes listed as European sizing standard