Hydrating skincare serum, now for hair. Blond Absolu 2% Pure Hyaluronic Acid Serum is a hydrating, repairing blonde hair and scalp serum. It's the ultimate blonde repair serum for bleached blondes as it contains Hyaluronic Acid - with Kerastase's highest concentration of Macro and Micro Hyaluronic Acid - to repair the surface damage of hair and moisturise both hair and scalp. . This lightweight texture serum preserves the scalp barrier, leaving a feeling of comfort. Hair is left replenished, plumper and intensely hydrated. Repairs damage in one use, for 95% stronger blonde hair.