| abstract |
The present invention relates to specific synergistic active skin- and/or hair lightening and/or senile keratosis-reducing (cosmetic or pharmaceutical) preparations comprising a mixture or consisting of a) a tyrosinase-inhibiting amount of one or more compounds of the formula (1), wherein R1, R2, R3, R4 and R5 are defined as described herein, and b) a skin- and/or hair lightening and/or senile keratosis-reducing amount of one or more compounds selected from the group consisting of (i) chelating agents, (ii) phenolic derivatives, plant extracts with an amount of phenolic derivatives and (iii) organic acid derivatives as well as uses thereof. |