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In the UK you can only buy it online most of the time, I get mine from here: http://www.honest-to-goodness.org.uk/index.php/catalogsearch/result/?q=vital+wheat

Alternately apparently you can make...

I tend to make seitan once or twice a month using different recipes, I can't really see eating a lot to be bad but what you could try is adding things to it to reduce the gluten content such as...