crystal deodorant

Americans hate body odor. That is why we embrace antiperspirants and deodorants with such enthusiasm. You can’t blame us. Anyone who has traveled abroad has probably experienced some pretty strong smells from people traveling on public transportation.

Many people are leery of the aluminum found in antiperspirants. That’s why they have gravitated towards natural crystal deodorants. When people see the word “natural” they automatically assume it must be safe. And yet many natural products are not necessarily harmless. This reader wants to know about alum.

How Safe Is Alum in Underarms?

Q. Would you please comment on the safety of alum as a deodorant? I think it is the ingredient in many “Crystal” antiperspirant products.

A. We have heard from lots of readers that they gave up aluminum-based antiperspirants because of a fear of either Alzheimer’s disease or cancer. Here are just a couple of examples:

“The women in our family have been using crystal roll-on for some time, as we’ve been avoiding aluminum and parabens for years and we find that it works well.”


“For more than 10 years I’ve used deodorant-only products, because someone warned of a cancer risk. It’s a bit hard to find, but I found a crystal roll-on product that is fragrance, paraben and aluminum chlorohydrate free. Seems to work well. If I hadn’t just bought a new bottle, I’d try the Graedons’ Milk of Magnesia roll-on deodorant.”


“Have started using crystal roll on deodorant which is paraben free and is a natural product. It is made from mineral salts and is also hypoallergenic and safe for the environment.”

What’s in Natural Crystal Deodorants?

Crystal deodorant sounds like the ideal solution for avoiding aluminum in an antiperspirant. There is one problem, however. Many of the manufacturers of such products are very cagey about the ingredients in their “natural” crystal deodorant products. There is no doubt that such products are natural, since aluminum is a mineral found in nature. You will sometimes see the word “alum” or potassium alum as the main ingredient.

The online Merriam-Webster dictionary defines alum as:

“a potassium aluminum sulfate KAl(SO4)2·12H2O or an ammonium aluminum sulfate NH4Al(SO4)2·12H2O used especially as an emetic [causes vomiting] and as an astringent and styptic [to prevent bleeding].”

Alum has been used for a very long time in reservoirs to clarify water. That is, it helps suspended particles settle to the bottom so they can be removed. It has also been used as a remedy for canker sores and in a styptic pencil to stop bleeding after shaving. That said, there is no doubt that alum contains aluminum, often hydrated potassium aluminum sulfate (potassium alum). Anyone who thinks that using a natural crystal deodorant eliminates aluminum is kidding herself.

How Concerned Should We Be About Aluminum?

Is the aluminum in natural crystal deodorants dangerous? That is a question that remains unanswered. How much aluminum is absorbed from delicate underarm tissue? No one has a good answer. That in itself is astonishing, since tens of millions of people use products with aluminum every day. They do this for decades. If aluminum is absorbed, does it pose any health risk?

Aluminum and the Breast:

An article in the Journal of the National Cancer Institute (Oct 16, 2002) concluded that there was no connection between use of antiperspirants and the risk of breast cancer.

More recently, though, a study suggests that aluminum compounds can change the way breast cells divide, even at low concentrations (Journal of Applied Toxicology, online, Jan. 6, 2012).

The authors of this research conclude:

“Our observations do not formally identify aluminium [British spelling for aluminum] as a breast carcinogen, but challenge the safety ascribed to its widespread use in underarm cosmetics.”

There is also research to suggest that aluminum concentrates in breast tissue, possibly from exposure to aluminum-containing antiperspirants (Journal of Applied Toxicology, April, 2011).

A study in the Journal of Inorganic Biochemistry (Nov. 2011) points out that:

“The human breast is exposed to aluminium from many sources including diet and personal care products, but dermal [skin] application of aluminium-based antiperspirant salts provides a local long-term source of exposure.”

These researchers note that nipple aspirate fluids have been shown to contain aluminum at higher levels in breast cancer patients than from healthy control subjects “providing evidence of raised aluminium levels in the breast microenvironment when cancer is present.”

A thoughtful review of this entire topic was published in Best Practice & Research. Clinical Endocrinology and Metabolism by a British oncology professor.

Some of the comments include:

“Several components of cosmetics have genotoxic properties, including the aluminium salts..”

“Dermal absorption of topically applied antiperspirant aluminium salts has been demonstrated through intact mouse skin and and the skin of the human underarm. Aluminium in the form of aluminium chloride or aluminium chlorhydrate has been shown capable of interfering with the function of oestrogen receptors of human breast cancer cells both in terms of ligand binding and oestrogen-regulated gene expression.”

That is, these compounds may act as hormone disruptors.

Aluminum and the Brain:

It comes as a surprise to most health professionals to learn that basic researchers have categorized aluminum as a neurotoxin. An article in Food and Chemical Toxicology (Sept. 2017) notes:

Neurotoxicity of Al [aluminum] is well established and linked to oxidative damage and neurodegeneration.”

Aluminum appears to cause oxidative stress in the brain. It does this in part by increasing inflammatory cytokines. These proteins are crucial cellular messengers that can lead to inflammation. Some neuroscientists now believe that Alzheimer’s disease is largely an inflammatory disease and that aluminum may play a role in its etiology.

An article in the journal Metabolic Brain Disease (July 27, 2017) notes:

“Intriguingly, chronic or cumulative exposure to aluminium reflected by increased levels in cerebrospinal fluid (CSF) and serum may be one environmental factor in the pathogenesis and pathophysiology of MS [multiple sclerosis], Parkinson’s disease (PD) and AD [Alzheimer’s disease]. There is a wealth of research examining the potential association between increased exposure to environmental aluminium and the development of the last of these illnesses. Indeed, a recent meta-analysis involving eight cohort- and case-controlled studies conducted prior to 2015 involving 10,567 participants concluded that increased aluminium exposure increased the risk of developing AD by some 71%.”

The authors conclude:

“Aluminium has no known beneficial physiological action in the human body and some genetic polymorphisms predispose to a greater susceptibility to its adverse effects. Therefore, a strong case can be made for avoiding unnecessary exposure to environmental sources of aluminium salts, especially on the part of children, pregnant mothers and women of child- bearing age who may become pregnant. Such avoidance need not lead to hardship or inconvenience; aluminium cookware may be replaced by safer alternatives, while aluminium- containing antiperspirants, potentially implicated in the rise of cases of breast cancer particularly affecting the upper outer quadrant of the mammary gland, may be replaced by non- aluminium versions.”

Are There Alternatives to Aluminum?

It will probably take many more years to resolve the controversy about any relationship between aluminum and breast cancer or Alzheimer’s disease. In the meantime, people who seek to avoid aluminum in their armpits will probably want to look beyond crystal-type natural deodorants. Many people find that milk of magnesia (MoM) applied to the underarm helps against odor, so that may be an attractive alternative. There is more information about this here.

Revised: 4/26/18

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  1. mary

    Thank you, Patty. Wish I had a next door testing lab.

  2. mary

    In the mid 80s I learned about the dangers of aluminum–especially in deodorants. People thought I was crazed and just on my soapbox again.
    I think [I KNOW NOW] I have been ‘duped’ into thinking the crystal ‘rock’ or Naturally Fresh Deodorant Crystal spray was safe. What did I think when I read the ingredient of ‘potassium alum’? I thought it was the alum used for pickling, a food source. And safe–but it is actually aluminum….. It does say NO aluminum chlorohydrate. Causing me to believe safe. Which spell check says is even incorrect spelling?—chloralhydrate? Oh yikes, missed this article and have not only been using for years but using in stocking stuffers for the entire family.
    I am so grateful for this information. [along with so much more you do to inform us]

    PS-back in the 80s I read all ingredients. Found Old Spice Lime was aluminum free but no longer able to find. One thing I learned back then was: there were men’s deodorants aluminum free but could not find any women’s.

  3. Jessica

    With all the conflicting information, I think I am doomed to stink.

  4. Patty

    A few people I know, in a group interested in using natural methods, kept insisting that the “crystal deodorant” they bought at their local health food store was deemed safe because it “didn’t have aluminum” in it. I had done a bit of research and was pretty sure they were wrong. I bought a crystal and took it to an enviromental testing lab next door to my business and had them test for aluminum. The crystal was over 70% aluminum. As I remember, one is supposed to wet the crystal and rub it in the armpit area. At the time, aluminum exposure was thought to be a cause for Alzheimer’s Disease. I shared my test results with the group via email and a few had a difficult time reconciling themselves to the test.

    I found within the group, the idea had also been spread verbally as well that “Chinese Chalk” was a safe way to repel and kill insects. For those who don’t know, Chinese Chalk are chalk sticks that come in a small red box and contain insecticide. A couple, belonging to the group, was renting a room from me, and had gone around my home, without permission, and drawn a line of the chalk in many places to kill gnats. We had a few in the house, but no infestation. I had planned to use a boric acid bait, but they apparently were impatient to wait for it to work.

    I did a bit of research and found that though the chalk was banned by the EPA in the U.S., it was imported to dollar stores in large shipping containers in mixed loads of goods and had been escaping detection by port inspectors. It was cheap and worked, but contained toxic chemicals that are so dangerous, they are banned in the USA. The boarder was quite put out when I asked them to use an ammonia-based cleaner and paper towels and to clean every spot where they’d used it. The woman refused to believe it was toxic to people, simply because she listened to a rumor that it was safe.

    I think everyone needs to verify so called “facts” they hear from others on any product they are considering using. One must use a reliable source that can be trusted, since many people read something on the internet that “sounds good,” and reprint it verbatim on their own site. Some readers readily consider something truthful when they find the same data repeated elsewhere.

  5. Mary E.

    In an effort to avoid the aluminum I switched to plain old MofM. I developed a rash from using that. I have since switched to Tom’s of Maine. They have a product specifically labeled as Aluminum free. Seems to work fine. A bit on the sticky side for just a few moments but I’ve gotten used to it. They even sell it at my local BJ’s, so I don’t have to hunt for it.

  6. mickey

    I thought it was titanium in deodorants that was the greatest harmer?

  7. Vic
    Florida, USA

    I am a chemist. Although I usually use a conventional deodorant that contains the usual Aluminum compound, I am leery of it. My guess is that the Aluminum in this case is not absorbed much into the body because it is in a water-insoluble form…but who knows, I have not seen any studies on that (they may exist, however). I would not use a salt block containing alum, potassium alum, etc. I am concerned that this would easily be absorbed into the body. The reason for my concern is Alzheimers. It is well-established that Al is found in alzheimers lesions in the brain. I met a researcher who confirmed that the scientific community still believes this.

    However, heavy metals as a group might be a problem. Please note that many “non-Aluminum containing” deodorants may contain a closely related compound that uses Zinc instead of Aluminum as a key aspect. This compound is very good at combating smells, however, it is possible (but maybe not likely) that zinc could be absorbed into the body. So there is some caution here. If you have this kind of concern, I would look for something that doesn’t contain aluminum or zinc.

  8. Lucinda L.

    I stopped using commercial antiperspirant several years ago. Lemon juice is perfect.

  9. Kay

    Is arm & hammer essentials deodorant safe. It says no aluminum or parabens?

  10. Mary Jane

    I make my own deodorant, using shea butter, coconut oil, baking soda (the real odor-absorbing ingredient), and lavender oil. There are many recipes on line.

    • Pete

      Lavender oil is a hormone disruptor. It is fairly safe to smell. Not safe to put on your skin.

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