<<Disclaimer: Verify this information before applying it to your situation.>> I just talked to customer information at McIlhenny, the makers of Tabasco sauces. At first she was not too sure of what I was saying, I had to spell out gluten. But, she did say the vinegar was from corn-mostly. And, that yes, it was gluten free. I was reminded by a chemistry teacher that ethyl acohol, which is the source of quite a bit of distilled vinegar can be made from different sources including corn or petroleum distillates. So, if you have corn problems (like me) be forewarned. cbh in sunny and breezy Montana