Study participants used their typical hair products - including creams, sprays and oils - and heating tools in a controlled home environment.
D4 and D5 have been associated with "fatal liver and lung damage in mice" and "adverse effects on the respiratory tract, liver, and nervous system of laboratory animals," respectively.
"Surveys on different population groups indicate 16 to 70% of participants use leave-on hair care or hair styling products," the scientists wrote.
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