半乳糖是一種單糖，是葡萄糖的C4異構體，是乳糖在腸道中水解的產物之一。在化妝品中作多方面的皮膚調理劑使用。 Monice M. Fiume,Wilma F. Bergfeld,Donald V. Belsito,Ronald A. Hill,Curtis D. Klaassen,Daniel C. Liebler,James G. Marks,Ronald C. Shank,Thomas J. Slaga,Paul W. Snyder,Lillian J. Gill,Bart Heldreth. Safety Assessment of Monosaccharides, Disaccharides, and Related Ingredients as Used in Cosmetics[J]. International Journal of Toxicology,2019,38(1_suppl).