Carnation is part of Nestle. Nestle is a celiac friendly company . . . they do not hide gluten in vague terms like "natural flavor". So if you don't see the words wheat, rye, barley or oats on the label then it is OK.
Here is a list of a lot of companies that practice this same policy
http://www.glutenfreeindy.com/foodlists/in...donothidegluten