Lawsuits allege long-term use of chemical hair relaxers and straighteners is linked to uterine cancer, endometrial cancer, and ovarian cancer — and that manufacturers failed to warn women who used these products for years.
Chemical hair relaxers and straighteners contain endocrine-disrupting chemicals — including phthalates, parabens, and formaldehyde-releasing agents — that can be absorbed through the scalp, particularly where application causes scalp burns or lesions.
In 2022, a large NIH-funded study (the Sister Study) reported that women who frequently used hair straightening products had more than double the risk of uterine cancer compared with non-users. Following publication, thousands of women filed lawsuits against manufacturers including L'Oréal, Revlon, and Strength of Nature.
Federal claims are consolidated in a multidistrict litigation in the Northern District of Illinois (MDL 3060), which has grown into one of the larger pending MDLs, with bellwether case selection underway.
MDL 3060 in the Northern District of Illinois is among the largest active MDLs, with thousands of pending cases. Bellwether case selection and expert challenges are underway — no global settlement has been announced.
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