Galactose, With6H12O6- monosaccharide from a group of hexoses. Galactose is widely distributed in nature, is part of glycosides, higher polysaccharides (agar, gum Arabic). Galactose is well absorbed by the body. It occurs in the breast, the splitting of polysaccharides in the gut, and in doing organism part of other compounds (e.g. lactose into glucose. With the introduction of large quantities of galactose observed galactosemia, galactosuria.