MSG

There is some debate on wether MSG is always gluten-free (usually made thru bacterial fermentation, but could also be extracted from wheat protein…)

BUT, it can be a separate allergen (very similar in symptoms to gluten sensitivity) AND since most celiac site say it is SAFE & Gluten-FREE (including the U of Chicago below), then it is possible that IS it an ingredient in "gluten-free" products...

[So even though a product is "gluten-free" it may still contain MSG…which may be fine unless you are ALSO allergic to MSG (which it seems is common among those allergic to gluten)]

Were is MSG Hidden?

http://www.truthinlabeling.org/II.WhereIsMSG.html 

Hidden Sources of MSG:

http://www.truthinlabeling.org/hiddensources.html 

What Foods Should I Avoid?

http://www.msgtruth.org/avoid.htm

MSG and Celiac Sprue:

http://www.msgtruth.org/msgand2.htm 

UNIVERSITY OF CHICAGO: CELIAC DISEASE CENTER

http://www.celiacdisease.net/gluten-free-diet 

All About Wheat Protein:

http://www.landfood.ubc.ca/courses/fnh/301/protein/protq4.htm 

Everything You Need To Know About Glutamate and MSG:

http://www.foodinsight.org/Resources/Detail.aspx?topic=Everything_You_Need_To_Know_About_Glutamate_And_Monosodium_Glutamate