Non-therapeutic use of at least one compound of the formula (1) ** (See formula) ** wherein R 1 represents a linear or branched C 1 to C 20 alkyl group, R 2 represents - H, R 4 represents - H, - an alkyl group C1 to C20 linear or branched or - a linear or branched C2 to C20 alkenyl group with one or more double bonds, R3 represents a radical selected from - H, - a linear or branched C1 to C20 alkyl group, - a C2 alkenyl group to C20 linear or branched with one or several double bonds, wherein the alkenyl group may also be substituted with one or more saturated or unsaturated C3 to C12 cycloalkyl groups, - linear or branched C2 to C20 alkynyl group with one or more triple bonds, - C3 to C12 saturated or unsaturated cycloalkyl group, where the rings can each also be bridged by groups - (CH2) n- with n>； = 1 to 3, - an acyl radical of the formula -C (>； = O) - R6, R6 represents - a linear or branched C1 to C20 alkyl group, - a radical of the formula the (ll) ** (See formula) ** wherein X represents linear or branched C1 to C6 alkylene or linear or branched C2 to C6 alkenylene and the radicals R5 are independently selected from H, OH, alkyl C1 to C6 linear or branched or O- (C1 to C6 alkyl) linear or branched, for the care, preservation or improvement of the general condition or phenotype of the skin or hair.Uso no terapéutico de al menos un compuesto de la fórmula (l) **(Ver fórmula)** en donde R1 representa un grupo alquilo C1 a C20 lineal o ramificado, R2 representa - H, R4 representa - H, - un grupo alquilo C1 a C20 lineal o ramificado o - un grupo alquenilo C2 a C20 lineal o ramificado con uno o varios enlaces dobles, R3 representa un radical seleccionado de - H, - un grupo alquilo C1 a C20 lineal o ramificado, - un grupo alquenilo C2 a C20 lineal o ramificado con uno o varios enlaces dobles, en donde el grupo alquenilo también puede estar sustituido con uno o varios grupos cicloalquilo C3 a C12 saturados o insaturados, - grupo alquinilo C2 a C20 lineal o ramif
