Chitotriose trihydrochloride (CAS# ) is a chitosan oligomer which has shown to increase the intestinal absorption of insulin and water-soluble macromolecules in rats.
Akiyama, K.; et al.: Carbohydr. Res., 279, 151 (1995); Gao, Y.; et al.: Int. J. Pharm., 359, 70 (2008).