These guides are available from various celiac groups and attempt to gather information on what is safe and what is not. Like any such guide (mine included) you must keep in mind that (1) mistakes may be made (2) manufacturers may be mistaken and (3) the ingredients may change after the guide has been printed. In any case it is always best to check directly with the manufacturer, since this gives you the most up-to-date information and has the good effect of adding to the numbers of calls they get about gluten-free foods, which can only help convince them to become more educated about our needs and work towards clearer labeling. Still, these guides are a good starting point in looking for foods likely to be safe, helping to weed down the thousands of choices on every grocery store shelf to those that may still be gluten-free.
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Tri-County Celiac Sprue Support Group
34638 Beechwood Street
Farmington Hills MI 48335