GLUTEN FREE CONFIDENCE SCORE: 8/10

Balsamic vinegar is made from grapes and it should be gluten-free. Interestingly enough, there is a small chance that the casks that balsamic vinegar could have gluten contamination from a wheat based paste that is sometimes used to seal those casks. Again, the chances that this is the case are quite low and someone would have to be extremely sensitive to gluten to get a reaction from this.