Kerastase Fusio-Dose Concentre Densifique is a part of the Fusio Dose family of professional hair treatments with unique formulas containing highly concentrated active ingredients designed to resolve all your hair concerns. Kerastase Fusio-Dose Concentre Densifique is meant to address Fine or Thinning Hair as the primary concern, and it must be combined with the booster of your choice to address a secondary hair concern. The beauty of the Fusio-Dose is that you can create a tailor-made solution based on your hair needs and combine different hair treatments into ONE by mixing the concentrate with different types of boosters to address your hair needs. The freshly fused treatment with an initial dose of goodness will fundamentally treat your hair and immediately transform it for lasting results.