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the claim

Using permanent hair dye increases the risk of breast cancer.

the verdict
CONTESTED PARTIAL
Recorded sources
5 sources for · 1 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that using permanent hair dye increases the risk of breast cancer?

Partly. A large US cohort found no overall cancer increase but a dose-related rise in some hormone-receptor-negative breast cancer subtypes, while a Danish cohort reported no increased risk of cancer types other than melanoma. A meta-analysis and a systematic review describe the hair-dye/breast-cancer association as debated or limited to subgroups, so the evidence covers only part of the claim.

Verdict: CONTESTED PARTIAL · 5 sources for, 1 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 5
Hair chemicals may increase breast cancer risk: A meta-analysis of 210319 subjects from 14 studies
2021
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Xu, S., Wang, H., Liu, Y., Zhang, C., Xu, Y., & Tian, F. (2021). Hair chemicals may increase breast cancer risk: A meta-analysis of 210319 subjects from 14 studies. doi.org. https://doi.org/10.1371/journal.pone.0243792

Evidence against · 1
Morbidity and Mortality in 7,684 Women According to Personal Hair Dye Use: The Copenhagen City Heart Study followed for 37 Years.
2016
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S, V., SF, N., P, S., & BG, N. (2016). Morbidity and Mortality in 7,684 Women According to Personal Hair Dye Use: The Copenhagen City Heart Study followed for 37 Years.. doi.org. https://doi.org/10.1371/journal.pone.0151636

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More for · 4
Does Hair Dye Use Increase the Risk of Breast Cancer? A Population-Based Case-Control Study of Finnish Women
2015
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Heikkinen, S., Pitkäniemi, J., Sarkeala, T., Malila, N., & Koskenvuo, M. (2015). Does Hair Dye Use Increase the Risk of Breast Cancer? A Population-Based Case-Control Study of Finnish Women. doi.org. https://doi.org/10.1371/journal.pone.0135190

Personal use of permanent hair dyes and cancer risk and mortality in US women: prospective cohort study
2020
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Personal use of permanent hair dyes and cancer risk and mortality in US women: prospective cohort study. (2020). doi.org. https://doi.org/10.1136/bmj.m2942

An integrated study combining network toxicology machine learning and molecular simulation reveals the molecular mechanisms of permanent hair dyes in breast cancer.
2026
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X, Y., Y, L., T, Z., B, H., J, W., S, Z., & L, M. (2026). An integrated study combining network toxicology machine learning and molecular simulation reveals the molecular mechanisms of permanent hair dyes in breast cancer.. doi.org. https://doi.org/10.1007/s12672-026-04585-1

Association between hair dye use and human cancers: A systematic review.
2026
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RK, G., J, M., C, N., G, B., & NA, M. (2026). Association between hair dye use and human cancers: A systematic review.. doi.org. https://doi.org/10.1016/j.jdin.2025.10.009

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