Allergy labels might not be giving consumers the help they need. A new study says the food labels could be confusing to shoppers. Dr. Moshe Ben-Shoshan at McGill University in Canada says it's time to take a hard look at the information on the labels. The researcher found that using phrases containing the words "not suitable" in warnings on packaging was the most effective way to prevent the purchase of products that trigger allergic reactions. Labels that only used phrases containing the words "may contain" and "manufactured in a facility" weren't as effective. He also found that shoppers are more careful about reading the labels when they are buying groceries for someone else. An estimated 15 million people in the U.S. have food allergies. Results of the study are published in the "Journal of Allergy and Clinical Immunology."