Use of xanthines, optionally incorporated into liposomes, to promote skin pigmentation or hair.

The invention relates to the use of XANTHINES, EVENTUALLY INCORPORATED IN LIPOSOMAS, TO PROMOTE skin pigmentation or hair. THIS xanthine having the formula (I) or a salt thereof, or extract PLANT THAT CONTAINS, IN WHICH, IN PARTICULAR R SUB 3 YR SUB 4 each represent a hydrogen atom and R sub 1 YR sub 2 identical or different each represent a hydrogen atom or an alkyl radical preferably having from 1 to 4 carbon atoms. THIS xanthine, EVENTUALLY INCORPORATED IN LIPOSOMAS, is used for preparing a composition cosmetic or pharmaceutical, PARTICULARLY FOR DERMATOLOGICA skin pigmentation or hair OR TO STRENGTHEN DEFENSES AGAINST NATURAL SKIN solar radiation.