There’s been talk about the compounds found in deodorants to be a cause of breast cancer but research shows otherwise. Here are a few links you should check out:
Deodorants and cancer (cancerresearchuk.org)
Antiperspirants/Deodorants and Breast Cancer (cancer.gov)
The Great Debate: Does Antiperspirant Cause Breast Cancer? (bellasugar.com)
These are only some articles on the net but there’s lots more out there you can look up on if you’re not satisfied with the ones above or if you’re interested in learning more.