Men and women who notice sensitised hair when the first grey hairs appear.Men and women who want to deepen their Densifique treatment.For all hair types, including coloured hair. Eric Pfalzgraf, Coiffirst: Densifique Serum Jeunesse is a revolution. It's like an anti-wrinkle for hair. I recommend it after every shampoo, on all hair types, to regain the properties of young hair.