The Kérastase Fusio Dose Booster Brilliance is an intensive yet lightweight treatment designed to enhance the natural shine of the hair fiber. This professional-grade booster is meant to be mixed with a corresponding Kérastase base product to deliver targeted nutrition and a radiant, glossy finish. Ideal for achieving salon-quality smoothness and light reflection, this additive transforms dull or lacklustre hair, leaving it visibly brighter and softer to the touch without weighing it down.