Abstract: A dispensing closure assembly for a container that permits a substance contained within a sealed capsule to be dispensed and mixed with other substance content contained within the container characterized in that the dispensing closure assembly includes a) an activating member (12) consisting of a closure cap (13a) disposed with at least one plunger (13b); b) at least one storage member (14) that contains substance; and c) a dispensing chamber (16) having a cavity (17a) to receive activating member (12), and at least one receiving chamber (17b) with an unsealing means (18) to accommodate the storage member (14); wherein the activating member (12) is adapted to be rotated into position where the at least one plunger (13b) is alignable with at least one receiving chamber (17b) and is pressable to urge the at least one storage member (14) against the unsealing means (18) to discharge the substance contained in the storage member (14) into the container; is and wherein dispensing chamber (16) is securely engageab