The present invention relates to a compound of formula (I) (R1-Arg-Gly-Asp-Gly-Ala-Asn-Pro-Asn-Ala-Ala-Gly-R2), formula II (R5-Arg-Gly-Asp-Gly-Pro-Gln-Gly-Pro-Gln-R6), or formula III (R9-Trp-Arg-Phe-Gln-Trp-Gln-Phe-Glu-Gln-R10), and to compositions comprising a compound of formulas I, II or III, as well as the use of said compounds and/or said compositions in the cosmetic treatment of skin and/or hair, and to the use thereof for inducing the formation of collagen.