R₁—(X)_m-AA₁-AA₂-AA₃-AA₄-AA₅-(Y)_n—R₂   (I)

their cosmetically acceptable isomers, salts, solvates and/or derivatives and mixtures thereof, wherein:

X is Ala;

AA₁ is Leu;

AA₂ is His;

AA₃ is Lys;

AA₄ is Val;

AA₅ is Lys;

Y is Val;

n and m are selected independently of each other from 0 and 1;

R₁ is selected from the group consisting of substituted or unsubstituted non-cyclic aliphatic, substituted or unsubstituted alicyclyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroarylalkyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl and R₅—CO— wherein R₅ is selected from the group formed by substituted or unsubstituted C₁-C₂₄ alkyl radical, substituted or unsubstituted C₂-C₂₄ alkenyl, substituted or unsubstituted C₂-C₂₄ alkynyl, substituted or unsubstituted C₃-C₂₄ cycloalkyl, substituted or unsubstituted C₅-C₂₄ cycloalkenyl, substituted or unsubstituted C₈-C₂₄ cycloalkynyl, substituted or unsubstituted C₆-C₃₀ aryl, substituted or unsubstituted C₇-C₂₄ aralkyl, substituted or unsubstituted heterocyclyl ring of 3 to 10 members, and substituted or unsubstituted heteroarylalkyl of 2 to 24 carbon atoms and 1 to 3 atoms other than carbon and an alkyl chain of 1 to 6 carbon atoms and

R₂ is selected from the group consisting of —NR₃R₄—, —OR₃ and —SR₃—, wherein R₃ and R₄ are independently selected from H, substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroarylalkyl, substituted or unsubstituted aryl, and substituted or unsubstituted aralkyl.