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FalseHealthLast updated: June 1, 2026

Antiperspirants cause breast cancer

Decades of epidemiological research have not established a link between antiperspirant or deodorant use and breast cancer risk. Regulatory agencies and cancer organizations consistently note there is no scientific evidence to support this claim.

What we know

The concern about antiperspirants and breast cancer centers primarily on aluminum compounds, the active ingredients in antiperspirants, which temporarily block sweat ducts. Some researchers hypothesized that aluminum could act as a metalloestrogen, mimicking estrogen and potentially promoting cancer cell growth, or that blocking underarm sweat could cause toxic accumulation.

The National Cancer Institute, the American Cancer Society, and the National Breast Cancer Foundation have all reviewed available evidence and concluded that there is no established link between antiperspirant use and breast cancer. A 2002 study of 813 breast cancer patients and 793 controls found no increase in risk associated with antiperspirant use or underarm shaving. A subsequent 2006 study also found no association.

Skin absorption of aluminum from antiperspirants is very low, estimated at approximately 0.012 percent of the applied dose. This is far less than the aluminum absorbed from food in the same time period. A 2014 review in Critical Reviews in Toxicology and a 2023 systematic review both concluded that available evidence does not support an association between aluminum from deodorants and breast cancer.

Some in vitro studies have shown that aluminum can interfere with estrogen receptors in cultured breast cancer cells, and some small clinical studies reported higher aluminum levels in upper-outer quadrant breast tumors. These findings generate hypotheses but do not establish causation. Better-designed epidemiological studies remain the appropriate test, and they have not confirmed an effect.

Common claims

  • Aluminum in antiperspirants causes breast cancerNot established by epidemiology
  • Blocking sweat traps toxins causing cancerNo scientific basis
  • Parabens in deodorants cause cancerNo evidence from human studies
  • Antiperspirants cluster cancer in upper-outer breastNot supported by data

Evidence hierarchy

01NCI - Antiperspirants/Deodorants and Breast Cancer Fact SheetOfficial NCI review concluding no scientific evidence links antiperspirant use to breast cancer development.02American Cancer Society - Antiperspirants and breast cancer riskComprehensive review confirming no strong epidemiological evidence linking antiperspirant use to breast cancer.03Correlation between daily life aluminium exposure and breast cancer risk (Science of The Total Environment, 2023)Systematic review of 13 studies on aluminum in breast tissue finding inconsistent results and insufficient evidence for a link.04Ohio State University - Aluminum in Antiperspirant: Cancer claim is a mythDermatologist-authored overview explaining why dermal absorption is too low to reach carcinogenic concentrations.

All sources

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