The invention relates to a primary composition in which at least one lipophilic bioactive compound is mixed with a whey protein, present in an amount effective to increase the bioavailability of the lipophilic bioactive compound. The invention also relates to an oral composition that contains the primary composition in a foodstuff, in a food supplement, or in a pharmaceutical preparation, and to a cosmetic preparation that contains the primary composition. Methods for increasing the bioavailability of the lipophilic bioactive compound and providing increased photostability and oxidation resistance are also provided.