<<Disclaimer: Verify this information before applying it to your situation.>> I wrote the folks at GlaxoSmithKline Consumer Healthcare about Geritol Tonic. I needed a good source of iron fast and that is what my OB recommended. Here is what they said: Dear Ms. Kepley, We have received your e-mail message regarding our product Geritol(r) Tonic multivitamin and iron supplement. There is no gluten in the Tonic. At GlaxoSmithKline Consumer Healthcare, we recognize our customers to be a very valuable asset and appreciate your taking the time to contact us. Sincerely, Maureen Product Information Specialist GlaxoSmithKline Consumer Healthcare Case # 1147501 Problem is that my research on the archives indicates that the source of the Brewer's Yeast is typically Barley. I wrote back to the rep bringing up the issue of the Brewer's Yeast and have NOT heard back. Anyone on the list know more about BY? Thanks, Shellie