Non-therapeutic cosmetic use of at least one dithiolane compound selected from those that respond to formula (I) ** Formula ** in which: Y designates O, NR1 or S R1 designates a hydrogen atom； a saturated, linear, C1-C20 alkyl or branched C3-C20 or unsaturated C2-C20 hydrocarbon group； a phenyl group optionally substituted with one or more hydroxyls and / or with one or more C1-C8 alkoxy radicals； R designates a hydrogen atom； or a saturated, linear, C1-C20 or branched C3-C20 or unsaturated C2-C20 alkyl hydrocarbon group； or a phenyl group optionally substituted with one or more hydroxyls and / or with one or more C1-C8 alkoxy radicals； or a saturated C1-C8 alkyl group having a phenyl substituent optionally substituted with one or more hydroxyls and / or with one or more C1-C8 alkoxy radicals； R optionally has one or more substituents selected from OR2, SR2, NR2R3, COOR2 in which: R2 designates a hydrogen atom or a saturated, linear, C1-C5 or branched C3-C5 or unsaturated C2-C5 hydrocarbon group , or a phenyl group； R3 designates a hydrogen atom； a saturated, linear, C1-C5 or branched C3-C5 or unsaturated C2-C5 hydrocarbon group； a phenyl group； an acetyl group. When Y designates NR1, R and R1 can form a ring selected from pyrrolidine, pyrroline, piperidine, piperazine, morpholine, thiomorpholine, azepine m>； = 0 or 1 or 2 n>； = 0 or 1 or 2 as well as their salts, their chelates, its solvates and its optical isomers, in a composition comprising a physiologically acceptable medium, with the aim of reinforcing and / or preserving the natural antioxidant protection of the skin against oxidative stress caused in particular by UV radiation.Utilización cosmética no terapéutica de al menos un compuesto ditiolano seleccionado entre los que responden a la fórmula (I)**Fórmula** en la que: Y designa O, NR1 o S R1 designa un átomo de hidrógeno； un grupo hidrocarbonado alquilo, saturado, lineal de C1-C20 o ramificado de C3- C20 o insaturado de C2-C20； un grupo fenilo eventu
