You may be painting on more than just a pretty color when using nail polish. A new study by researchers at Duke University and the Environmental Working Group found that some of the most popular nail polishes contain a suspected endocrine disruptor called triphenyl phosphate, or TPHP. Even worse, researchers suspect that those chemicals are entering the bloodstream as a result of nail polish application. Read on for the full list of the nail polish offenders named in the study.