The present invention provides a composition comprising an amphiphile and an active ingredient whose solubility in water at 20 DEG C. is not more than 10 g/L. The invention further relates to an amphiphile containing a hyperbranched polycarbonate which is linked to at least one linear or comb-shaped polymer, to a method for producing the amphiphile, and to the use of the amphiphile in compositions containing an active substance whose solubility in water at 20 DEG C is not more than 10 g/L.