A 2022 NIH study found that women who used chemical hair relaxers more than 4 times per year had more than double the risk of uterine cancer. Lawsuits are pending against L'Oreal, Revlon, and other manufacturers. This screener checks your usage history and diagnosis.
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In October 2022, the National Institutes of Health published a study in the Journal of the National Cancer Institute finding that women who used chemical hair straightening or relaxer products more than 4 times per year had a 2.5 times higher risk of developing uterine cancer compared to non-users. The study followed over 33,000 women ages 35-74.
Chemical hair relaxers contain endocrine-disrupting chemicals including phthalates, parabens, cyclosiloxanes, and bisphenol A - compounds known to interfere with hormone function. These chemicals can be absorbed through the scalp, especially when the relaxer causes scalp lesions, which is common.
Lawsuits have been filed against manufacturers including L'Oreal USA, Revlon, Strength of Nature, Namaste Laboratories (makers of Dark and Lovely and ORS products), and other brands. The cases are consolidated in an MDL in the Northern District of Illinois. Defendants are primarily makers of products marketed to Black women, who historically have had the highest rates of hair relaxer use and also face disproportionately high rates of uterine cancer and fibroids.
In addition to uterine cancer claims, attorneys are evaluating claims for uterine fibroids that required surgery (myomectomy or hysterectomy) in women with extensive hair relaxer use histories. Fibroids are non-cancerous but can cause serious health consequences. The evidence base for fibroid claims is still developing compared to the uterine cancer claims.