<<Disclaimer: Verify this information before applying it to your situation.>> Thank you to all that responded. From the majority of the emails that I received it looks like all CA wines are gluten free, if natural flavors is listed call and question it. No one reported to me that the yeast used is an issue. Looking in the archives I saw that in CA they ADD yeast, so I am still not quite sure on this issue. From my emails people confirmed with me that the following are definitely gf: Sutter Home Corbet Canyon Fetzer Mondavi Beringer Gallo If I get around to calling some wineries I will post what I find!