New research reveals that hair extensions contain dozens of toxic chemicals linked to cancer and reproductive harm, creating an environmental health disparity that disproportionately affects Black women.
Scientists from Silent Spring Institute conducted the most comprehensive analysis to date of chemicals in hair extensions and detected 169 chemicals across products. At least 12 of those chemicals have been associated with serious health harms and appear on California’s Proposition 65 list for cancer or reproductive toxicity.
The findings published February 11, 2026 in Environment & Health highlight what researchers explicitly call an environmental justice issue. Hair extensions are disproportionately used by Black women because of cultural norms, workplace bias, protective styling needs, and the economics of hair care. Silent Spring Institute frames the new findings as a concern that disproportionately affects Black women because this population is most likely to use extensions frequently and over many years.
The research identified multiple classes of concerning chemicals, including phthalates, flame retardants, and organotins. Both synthetic and human-hair products contained hazardous substances. Previous Consumer Reports testing of synthetic braiding hair detected carcinogens in 100% of samples and lead in nine of ten products.
The issue fits a broader pattern of environmental health disparities among Black women documented by the National Institute of Environmental Health Sciences. Many consumers switched to extensions after 2022 research showed chemical hair straighteners increased uterine cancer risk, making the discovery that extensions also carry chemical exposures particularly concerning for a community seeking safer alternatives.
See: “ALERT: Hair Extensions May Contain Dozens of Toxic Chemicals Linked to Cancer” (February 13, 2026)
