The lawsuit was filed in federal court in Chicago days after a study from the U.S. National Institute of Environmental Health Safety (NIEHS) found that hair-straightening products may significantly increase the risk of uterine cancer among frequent users.
Uterine cancer is the most common female reproductive system cancer, with 65,950 estimated new cases in 2022.
Some common ingredients of hair straighteners such as parabens, bisphenol A, heavy metals, and formaldehyde may contribute to the elevated risk of uterine cancer.