<<Disclaimer: Verify this information before applying it to your situation.>> After reading all the latest discussions about wine, yeast and gluten, I called Fetzer who makes my favorite wine.(I have no vested interest in Fetzer - just like their wine!) The rep was very friendly and shared all kinds of info about both sulfites (which bother me) and the yeast used in the wine-making process. They use Red Star yeast. I called the company and a rep left a very definite and credible message on my voice mail saying that Red Star yeast is definitely gluten-free. (I also checked with Fleishmans since my wife uses that for my bread; that is gluten-free also.) For those who are interested in avoiding sulfites, it is too much detail to go into - call the rep at Fetzers! But bottom line is that by looking at years and serial numbers, you can avoid the wines with the most active sulfites and chose those whose sulfites have mostly dissipated. He also surprised me by saying that choosing a white over a red was not a good predictor for the avoidance of sulfites.