CHICAGO, US: A new study by Northwestern University has revealed that the consumer complaints of adverse health problems related to cosmetic and personal care products have doubled from 2015 to 2016. The study is published in the journal JAMA Internal Medicine. The majority of those complaints stemmed from hair care products. Northwestern University researchers looked at complaints collected by the Food and Drug Administration (FDA) from 2004 to 2016. The information came from the FDA’s Center for Food Safety and Applied Nutrition’s Adverse Event Reporting System, which allows consumers or health care professionals to submit complaints about the harm caused by using cosmetic products.