New Blond Absolu 2% Pure Hyaluronic Acid Serum by Kérastase is a hydrating, repairing blonde hair and scalp serum. It's their ultimate blonde repair serum for bleached blondes, as it contains Hyaluronic Acid - with their highest concentration of Macro and Micro Hyaluronic Acid - the formula helps repair the look of surface damage of the hair and moisturises the scalp whilst leaving the hair feeling hydrated. This clear gel serum, with a lightweight texture, respects the skins natural barrier function and leaves the scalp with a feeling of comfort. Tested on freshly bleached hair, this Kérastase serum repairs the look of surface damage in one use*, for stronger blonde hair, that is replenished, feels plumper and beautifully hydrated. Just like with skincare, you can layer 2% Pure Hyaluronic Acid Serum with Blond Absolu Huile Cicaextreme hair oil, to seal in the care. Reduces the look of surface damage in one use.* Up to 95% stronger blonde hair.** *Instrumental test. **Instrumental test