The present invention provides a method for delivering a probiotic organism to an animal in need thereof, the method comprising the steps of: (i) administering the probiotic organism orally to the animal, and (ii) administering an effervescent agent orally to the animal to cause the generation of an effervescence product within the alimentary tract of the animal, wherein the probiotic organism and effervescence product co-locate at a site in the alimentary tract of the animal such that viability and/or a physiologic effect of the probiotic is improved relative to a method whereby there is no co-location of an effervescence product and the probiotic organism. The method may be used for treating a condition associated with the level or activity of probiotic bacteria in the alimentary tract, such as a digestive condition, an immune function condition, a wellness condition, or an allergic condition.
