For anyone who previously used Kérastase Bain Stimuliste GL, the Kérastase Specifique Bain Prevention is a reformulation designed to target thinning hair, in a handy double pack!The formula is made with super-active ingredients to help plump and boost each strand. It increases microcirculation activation and bulb nutrition, which results in the micro-circulation being activated. This helps to make hair fuller and thicker.