Dulcitol is a sugar alcohol and slightly sweet tastant for human taste cells. Dulcitol is a sugar alcohol and slightly sweet tastant for human taste cells. Dulcitol (Galactitol), a sugar alcohol derived through reduction of galatose, is studied to determine its role and mechanisms in pathologies such as cataract formation, hepatosplenomegaly and mental retardation. Galactitol is used as a substrate to identify, differentiate and characterize galactitol dehydrogenase(s).