A compound of general formula (I): R1-Wn-Xm-AA1-AA2-AA3-AA4-AA5-AA6-AA7-Yp-Zq-R2 (I) its stereoisomers, mixtures thereof and / or their salts cosmetically or pharmaceutically acceptable, characterized in that: AA1 is selected from the group consisting of -Arg-, -Lys-, -Gln-, -Asn-, -Glu- and -Asp-； AA2 is selected from the group consisting of -His-, -Gln-, -Asn-, -Glu- and -Asp-； AA3 is selected from the group consisting of -Leu- and -Phe-； AA4 is selected from the group consisting of -Lys- and -Leu-； AA5 is selected from the group consisting of -Arg-, -His-, -Lys-, -Gln-, -Asn-, -Glu- and -Asp-； AA6 is -Trp -； AA7 is selected from the group consisting of -Met-, -MetO- and -MetO2-； W, X, Y, Z are amino acids and are independently selected from themselves； n, m, p and q are independently selected from each other and have a value of 0 or 1； n + m + p + q is less than or equal to 2； R1 is selected from the group consisting of H, a polymer derived from polyethylene glycol, a substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroarylalkyl, substituted or unsubstituted aryl, aralkyl substituted or unsubstituted and R5-CO-, wherein R5 is selected from the group consisting of H, a substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl, substituted or unsubstituted heterocyclyl and substituted or unsubstituted heteroarylalkyl； R2 is selected from the group consisting of -NR3R4, -OR3 and -SR3, wherein R3 and R4 are independently selected from the group consisting of H, a polymer derived from polyethylene glycol, a substituted or unsubstituted non-cyclic aliphatic group, substituted alicyclyl, or unsubstituted, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroarylalkyl, substituted or unsubstituted aryl, and substitut
