<<Disclaimer: Verify this information before applying it to your situation.>> I received many responses to my question on the GF status of A-1 sauce. The consensus is that it is GF. I still wanted to confirm so I called Nabisco. They said that it is on their GF list but I persisted to question the carmel color and the vinager. The nutritionist finally got back to me. She could only say that those were both from artificial sources. I pressed for the source - especially the vinager. She said that it was a food grade alcohol NOT FROM GRAIN. That is all she could disclose because that is what her suppliers disclose. She insisted that the product is GF. That's the best I could do.