Abstract: The present invention relates to a cosmetic composition comprising 2,4-diaminopyrimidine 3-N-oxide and/or an organic or mineral acid salt thereof and/or a hydrate thereof, piroctone olamine, niacinamide, and at least 1% by weight of particular hydroxylated compound. The invention also relates to a process for the cosmetic treatment of human keratin materials such as the skin, notably human scalp, hair and/or eyelashes, comprising at least the application of the cosmetic composition according to the present invention. The present invention also relates to the use of said cosmetic composition for treating the loss and/or promoting the regrowth of keratin fibres.

Abstract: The present invention relates to an aqueous composition comprising at least one dispersion of polymer particles in a non-aqueous medium, at least one cationic polymer and at least one anionic polymer. The present invention also relates to a cosmetic treatment process, notably a process for styling keratin fibres, in particular human keratin fibres such as the hair, using this composition. Finally, the present invention relates to the use of this composition for the cosmetic treatment of keratin fibres, in particular of human keratin fibres such as the hair, and in particular for styling the hair, i.e. for shaping and/or fixing the head of hair.