Hello, the lab I work in is preparing to conduct a large study on exercise-induced gut permeability. We plan to have participants consume a sugar drink with lactulose, 13C mannitol, mannitol, and rhamnose and collecting blood and urine to assess gut permeability. I am having difficulty finding food grade versions of these sugars. I have found appropriate products for Mannitol and Rhamnose, but if you know of suppliers that provide any of the four sugars I mentioned above I would greatly appreciate you sending me a name and product # if you have one. Thank you!