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My wife, who has celiac, really loves the taste of Daura, but it has been giving her symptoms, so last week we tested it using the EZ Gluten test kit from ELISA Technologies. We came up with a reading that did not match any of the results described in the test kit booklet, so we called ELISA Tech directly. According to their representative, the reading we got was a positive for a high level of glutenin (as opposed to gliadin). The rep explained that the most commonly used tests for gluten measure only gliadin, while EZ Gluten measures both glutenin and gliadin levels (both of which are components of gluten). So if the brewery, Estrella Damm, is only measuring the gliadin levels, it's possible that they could come up with a reading of less than 6 ppm. But a low reading for gliadin is not the same as a low reading for gluten. Daura may still have very high glutenin levels, thereby causing celiac reactions.
I've written to Estrella Damm for more information about their testing process, but they have not responded. It's interesting that Daura has not been certified gluten-free. (Unless perhaps there's some kind of rule that entering a beer into a gluten-free beer contest is a substitute for gluten-free certification.)