The present invention relates to the use of at least one piperidine ester derivative of formula (I) below: in which: R1 is a linear or branched C1-C12 alkyl radical, R2 is a linear or branched C1-C20 alkyl radical, with the proviso that the sum of the carbon atoms for R1 and R2 is between 2 and 22, in a composition comprising, in a cosmetically acceptable medium, at least one liquid fatty phase and at least one lipophilic active agent, and containing no dibenzoylmethane-type UV screening agent, as a solvent for said active agent in said liquid fatty phase and/or as an agent improving the solubility of said active agent in said fatty phase. The present invention also relates to a composition comprising, in a cosmetically acceptable medium, at least one liquid fatty phase, characterized in that it comprises at least one piperidine ester derivative of formula (I) as defined above and in that it does not contain a dibenzoylmethane-type UV screening agent.
