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I do not know if Cinnamon is GF but I can tell you from my experience working
with a nutritionist that Cinnamon is a very difficult thing to digest.  When
I first visited myu nutritionist the first thing she said was no spices, they
are too difficult to digest.
 
Maybe your wifes digestive system just needs a rest.  Cinnamon and other
spices only bother me if I eat them too frequently.  The same with other hard
to digest foods like tomatoes etc.
 
Karyn
South Bend,IN