| abstract |
The present invention concerns the use of a formulation containing or consisting of (a) one or more xanthines of the formula (II), wherein R5, R6 and R7 are independently of each other H or methyl, (b) one or more compounds of the formula (I), wherein: R1 and R2 are mutually independently H, OH, C1-C10 alkyl, C -C10 O-alkyl or O-prenyl, R3 is H, OH, O-glucose or O-rhamnose and R4 is a monosaccharide radical or an oligosaccharide radical having 2, 3, 4 or 5 carbohydrate units, and (c) optionally a skin or hair conditioning or cleansing substance, wherein the ratio by weight of the amount of (a) xanthines of the formula (II) contained in the formulation to the amount of (b) compounds of the formula (I) contained in total in the formulation is in the range from 50:1 to 1:10, as an agent for browning skin or hair in vivo. |