The invention is directed to the cosmetic use of oligopeptides according to formula (I) and/or (II), R 1 -Tyr- Pro-Trp-Phe-NH 2 (I); R 1 -Tyr-Pro-Phe-Phe-Nh 2 (II), wherein R 1 is linked to the NH 2 -group of the amino- terminal part of Tyr and is chosen from the group consisting of -H; a linear saturated or unsaturated or branched saturated or unsaturated acyl group having 1 to 24 carbon atoms, which may be functionalised by a -OH, -SH, -COOH or -CONH 2 group; a sterol or a sphingolipid group which is joined to the amino terminal part of Tyr via a bifunctional linker. The invention is also directed to certain oligopeptides as such.