Provided herein are (1) a method of mixing an aluminum salt adsorbed immunogen with a monophosphoryl lipid A (MPLA) containing liposome (L(MPLA)) and (2) the resulting immunogenic composition. The resulting immunogenic composition has an enhanced immunostimulation potency compared with either a composition comprising the uncapsulated immunogen mixed with the L(MPLA) or the aluminum salt adsorbed immunogen alone.