A compound of general formula: R 1 -W n -X m -AA 1 -AA 2 -AA 3 -AA 4 -AA 5 -AA 6 -Yp-Z q -R 2 its stereoisomers, mixtures thereof and/or its cosmetically or pharmaceutically acceptable salts, wherein AA 1 is -Tyr-; AA 2 is selected from the group formed by -Asn-, -His-, -Tyr- and -Glu-; AA 3 is selected from the group formed by -Lys-, -Ser- and -Pro-; AA 4 is selected from the group formed by -Gly-, -Leu-, -Lys- and -His-; AA 5 is selected from the group formed by -Gln- and -Asn-; AA 6 is -Val-; W, X, Y, Z are amino acids and are independently selected from amongst themselves; n, m, p and q are independently selected from amongst themselves and have a value of 0 or 1; n+m+p+q is smaller or equal to 2; R 1 is selected from the group formed by H, a polymer derived from polyethylene glycol, substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroarylalkyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl and R 5 -CO-, wherein R 5 is selected from the group formed by H, substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl, substituted or unsubstituted heterocyclyl or substituted or unsubstituted heteroarylalkyl; R 2 is selected from the group formed by -NR 3 R 4, -OR 3 and -SR 3, wherein R 3 and R 4 are independently selected from the group formed by H, a polymer derived from polyethylene glycol, substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroarylalkyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl; and R 1 or R 2 are not α-amino acids AA 1 is -Tyr-; AA 2 is selected from the group formed by -Asn-, -His-, -Tyr- and -Glu-; AA 3 is selected from the group formed by -Lys-, -Ser- and -Pro-; AA 4 is selected from the group formed by -Gly-, -Leu-, -Lys- and -His-; AA 5 is selected from the group formed by -Gln- and -Asn-; AA 6 is -Val-; W, X, Y, Z are amino acids and are independently selected from amongst themselves; n, m, p and q are independently selected from amongst themselves and have a value of 0 or 1; n+m+p+q is smaller or equal to 2; R 1 is selected from the group formed by H, a polymer derived from polyethylene glycol, substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroarylalkyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl and R 5 -CO-, wherein R 5 is selected from the group formed by H, substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl, substituted or unsubstituted heterocyclyl or substituted or unsubstituted heteroarylalkyl; R 2 is selected from the group formed by -NR 3 R 4, -OR 3 and -SR 3, wherein R 3 and R 4 are independently selected from the group formed by H, a polymer derived from polyethylene glycol, substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroarylalkyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl; and R 1 or R 2 are not α-amino acids