Kérastase Fusio-Dose Booster Nutritition Fusio-Dose is a revolutionary hair service that offers tailored and personalised hair treatment solutions for instant hair transformation. The powerful blend of concentrates and boosters delivers targeted active ingredients that provide double the benefits in a single application, making it more effective than any other treatment. With up to 30 possible combinations, Fusio-Dose transforms your hair in less than 5 minutes for a truly personalised hair care experience.