<<Disclaimer: Verify this information before applying it to your situation.>>

I had a reply from ConAgra Foods re their tuna.  It is all gf; however they
do add hydrolyzed protein as a flavoring ingredient.  The ones currently used
are derived either from casein (primary protein constituent of milk or a soy
protein).  They also add a small amount of flavoring broth made from the
following list of vegetables:  carrots, peas, green & red bell peppers,
onions, parsley, celery and garlic.

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