The Kerastase Fusiodose hair booster constitutes a unique care which is recommended for colour-treated and dull hair which lacks shine. Thanks to the use of unique, carefully selected ingredients, it ensures gentle care which does not weigh hair down. Perfectly nourishes and strengthens hairAdds shiny brillianceLeaves your hair soft to the touchMultifunctional How to use: Choose an ampoule and fit it on the product, then turn it clockwise. A dose of 6 ml will be automatically administered. Shake the mixture well before spreading its content across the whole hair length. Rinse thoroughly after 4-5 minutes. Result: Nourished, stronger and shiny hair. The boosting system should be combined with a concentrate (ampoule) which is tailored to individual needs and type of hair.