<<Disclaimer: Verify this information before applying it to your situation.>> Christie, Please be really polite when you contact these companies. I know you find it hard to just take their word, but if we antaginize them we will be worse off than before. I eat Wishbone with no problem - however, I have not had their thousand island. If we get them mad as us then they just shut down and will not tell us about any GF products. How do you know that their vinegar is made from wheat, oats, barley or rye? (as you stated?) The girl on the phone with you only knows what she is told to say - that it is GF. If you want to know more please kindly ask her to find out how her company knows. If we ask nice we find out more. Just my advice. Jane Fargo, ND