A composition consists of an effective amount of a synthetic neutral fucosylated human milk oligosaccharide (“HMO”), an effective amount of a synthetic neutral non-fucosylated HMO, and one or more excipients acceptable for enteral administration to a non-infant human. In some embodiments, the synthetic neutral fucosylated HMO is 2′；-fucosyllactose and the synthetic neutral non-fucosylated HMO is selected from lacto-N-neotetraose (“LNnT”) and lacto-N-tetraose (“LNT”). In certain embodiments, the mass ratio of 2′；-FL to the selected LNnT or LNT is about 1.5 to about 4.5. In one embodiment, the synthetic neutral non-fucosylated HMO is lacto-N-neotetraose (“LNnT”). In certain embodiments, the one or more excipients acceptable for enteral administration to a human are selected from diluents, antioxidants, lubricants, colorants, binders, disintegrants, and combinations thereof. In various embodiments, the one or more excipients are effective to form a galenic unit dosage form selected from a capsule, a tablet, and a sachet.
