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

I emailed Betty Crocker regarding the gluten content of their frostings.  Here is their reply:

Dear Ms. Kelley-Mull: 
  
Thank you for contacting General Mills regarding gluten in General Mills products.  
It is our primary goal to help our consumers determine whether or not they can include our products in their diet.  To accurately accomplish this, we believe it is best to refer to the specific ingredients listed on each product package.  

However, we do understand that ingredients can be confusing, so we want to assure you if the ingredient label does not list wheat, barley, rye, oats or other sources of gluten, then the product would be gluten-free.  Sources of gluten are listed on the label even if the source of gluten is part of another ingredient (such as flavoring or spice).  Because ingredients may vary from one package to another due to product reformulation, you should use the product's ingredient label to provide you with current and accurate information. 

Additional information regarding gluten may be obtained by contacting your health care professional or: 

    Celiac Sprue Association/United States of America, Inc. 
    PO Box 31700 
    Omaha, NE  68131-0700 
    402-558-0600 
    www.csaceliacs.org 

We hope this information is helpful. 

Sincerely, 

Alexandria Richards 
General Mills 
Consumer Services 

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