Deodorant and breast cancer: what does the science *really* say?
It’s one of the most persistent health concerns circulating about personal care: does the aluminum in your deodorant cause breast cancer? It’s an understandable question. You use the product daily, close to a sensitive body part, and the concern is widely shared online. This concern deserves an honest, factual answer, not a reassuring, pitying response, nor an exaggerated warning. So, what has been researched, and what are the results?
By Zero·One Redactie
1 July 2026
3 min. reading time
Where does the concern come from?
The theory is usually constructed as follows: aluminum salts in antiperspirants are absorbed through the skin, especially when shaving leaves small skin abrasions, and would then have hormone-like effects that influence cell growth in breast tissue. This theory has been circulating since the early 2000s, partly due to a widely shared study that found aluminum in breast tissue near tumors.
It is important to distinguish between research design and outcome: finding a substance in tissue does not prove a causal link with the development of a disease.
What do the major health organizations say?
Several independent, large-scale health organizations have investigated this question:
The Dutch KWF (Cancer Society) has found no evidence of a causal link between the use of deodorant or antiperspirant and the development of breast cancer.
The American National Cancer Institute concludes, based on available epidemiological research, that there is no strong evidence that chemicals in antiperspirant or deodorant increase the risk of breast cancer.
Cancer Research UK, one of the largest independent cancer research organizations in the world, draws the same conclusion: there is no good evidence for a link.
These three organizations are independent of each other, use strict scientific methodology, and independently reach the same conclusion.
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Why does the myth persist?
A few reasons underpin this.
Firstly, finding aluminum in tissue is not surprising in itself: aluminum is one of the most common metals in the earth's crust and already enters our body through food, water, and air, regardless of deodorant use. Finding it says nothing about the cause of a tumor.
Secondly, the location where deodorant is applied, close to the breast, is intuitively disturbing, even if intuition is not scientific evidence.
Thirdly, health concerns spread faster and more convincingly online than reassuring, nuanced scientific conclusions. A simple fear is easier to share than an epidemiological study.
Is the aluminum in my antiperspirant safe then?
Within the European Union, this question has been extensively assessed by the Scientific Committee on Consumer Safety (SCCS), the independent body that advises the European Commission on the safety of cosmetic ingredients. Their conclusion: aluminum in antiperspirants is safe up to a concentration of 6.25% in non-spray products.
This limit was not chosen arbitrarily. The SCCS has taken into account total aluminum exposure from all sources (food, water, cosmetics) and determined what level remains well within a safe margin. This is precisely why the EU limit is lower than some American products: it is a stricter, more cautiously established safety level, not a sign that aluminum itself would be dangerous.
What does this mean for your choice?
If you prefer not to use aluminum, that is a valid personal preference, and there are plenty of aluminum-free options. But if the reason for that choice is a concern about breast cancer: that concern is not supported by the available research from independent health organizations.
Those who do choose an aluminum formula opt for a product that, within the EU limit, has been scientifically assessed as safe and effectively reduces sweat. This is a different consideration than masking odor, which aluminum-free products do offer but without reducing sweat itself.
Frequently asked questions
Has a direct link ever been shown between deodorant and breast cancer? No. Large, independent health organizations such as the KWF, the National Cancer Institute, and Cancer Research UK have found no causal link.
Why do researchers then find aluminum in breast tissue? Aluminum enters the body through food, water, and air, even without deodorant use. Finding it in tissue does not prove a cause-and-effect relationship with tumor development.
Is the aluminum in EU products different from American products? The EU applies a lower maximum concentration (6.25% in non-spray products) than some American products, determined by the independent SCCS after assessing total exposure from all sources.
Should I switch to aluminum-free deodorant to be safe? Based on current research, this is not necessary from a breast cancer perspective. Aluminum-free is a valid choice for other reasons, such as personal preference or sensitive skin, but it does not reduce sweat.
Where can I find the original sources? The positions of the KWF, the National Cancer Institute, Cancer Research UK, and the SCCS opinion (SCCS/1613/19) are publicly available on their respective websites.
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