Method for preparing a cosmetic or dermatological composition, of a sufficient amount of peptides of sequence (Gly-Pro-Gln).sub.n-NH.sub.2, wherein: n ranges between 1 and 3, and the amino acids can be in the form L, D or DL; the peptides or the composition being designed to: promote adhesion between skin cells, promote cell adhesion, to provide curative and/or preventive treatment for ageing skin symptoms (of physiological or solar origin) and to enhance skin appearance. In a preferred embodiment, the peptide is of sequence (Gly-Pro-Gln).sub.2-NH.sub.2.