Does Antiperspirant Cause Breast Cancer?What the Research and the Label Say

You may have seen posts warning that antiperspirant causes breast cancer, or switched to an aluminum-free product just in case. Here is what the National Cancer Institute (NCI)¹ says, and the label warning that matters more for many women over 50.

Myth: antiperspirant causes breast cancer

NCI says no scientific evidence links antiperspirants or deodorants to the development of breast cancer.¹

Where the worry comes from: antiperspirants use aluminum compounds that form a temporary plug in sweat ducts, and some researchers suggested aluminum absorbed through the skin might act like estrogen.¹ But no studies have confirmed meaningful harmful effects, and a 2014 review found no clear evidence that aluminum antiperspirants raise breast cancer risk.¹

What the studies looked at

• A 2002 study of 813 women with breast cancer and 793 without found no increased risk from antiperspirant or deodorant, even when used within an hour of shaving with a razor.¹
• A small 2006 study also found no link.¹
• A 2003 study of breast cancer survivors suggested earlier diagnosis in frequent users, but it looked back in time and wasn’t conclusive.¹

NCI notes that results have been mixed and more research would be needed to settle the question completely.¹

What about parabens?

Parabens are preservatives that can mimic estrogen and have been found in breast tumors, but there’s no evidence they cause breast cancer.¹ Most U.S. antiperspirants and deodorants don’t contain them now.¹

The label warning many women miss

Antiperspirant Drug Facts labels say: “Ask a doctor before use if you have kidney disease.”² They also say not to use them on broken skin and to stop if a rash or irritation develops.² If you have kidney disease, ask your clinician whether an antiperspirant is right for you, or whether a deodorant without aluminum would be a better fit.

Other things to know

• Mammogram day: many imaging centers ask you to skip underarm products. Our guide to deodorant before a mammogram explains why.
• Antiperspirant vs. deodorant: they do different jobs. See what’s the difference.
• Aluminum-free claims: our article on armpit “detox” covers the switch.

If you’re worried about breast cancer risk, talk with your doctor about your personal and family history.

Arms Up includes a Fresh Log with a four-point sweat scale. Use it to compare products and note any irritation zone by zone. See the book.