All Xylitol has the exact same molecular structure. A molecule of Xylitol derived from corn is identical to a molecule derived from birch.
Allergy
People who have an intolerance of corn based products need not worry about the corn derived Xylitol. After the Xylitol is produced there are no corn proteins left over to provide any allergen.
Renewable
Xylitol that is derived from corn uses the cobs that would normally go to waste.
All factories producing Xylitol require in-house laboratory testing of their final product to certify FDA compliance.