Cosmetic or dermatological preparations, which are finely dispersed systems of the oil-in-water or water-in-oil type, comprising 1. an oil phase, 2. an aqueous phase, 3. boron nitride which has both hydrophilic and lipophilic properties, i.e. has amphiphilic character, and thus positions itself at the water/oil interface, and 4. at most 0.5% by weight of one or more emulsifiers and also optionally comprising further cosmetic or pharmaceutical auxiliaries, additives and/or active ingredients.