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Medicinal Clay Properties, Health Benefits, and Precautions

Linda Crampton has an honors degree in biology. She is interested in chemicals from other organisms and their benefits to the human body.

Medicinal clay is often sold as a powder.

Medicinal clay is often sold as a powder.

Medicinal and Cosmetic Clays

Clay has been used medicinally for a very long time. It's been eaten (with specific precautions) to treat gastrointestinal problems and other diseases. It has also been used to remove toxins and kill parasites, packed into wounds to stop bleeding, and spread over the skin to treat surface ailments or improve the skin's condition. It's a popular material. Interestingly, scientists are finding evidence that supports some of the traditional beliefs about the health benefits of certain types of clay.

Medicinal and cosmetic clays are often sold as a powder, which may be white, grey, pink, red, green, blue, brown, or black in color. The color depends on the identity of the minerals that are present as well as the substances that are mixed with the clay, such as plant material. Edible clays are generally mixed with liquid to form a drink and are found in some health food markets. Cosmetic clays are found in a wider variety of stores.

Be Careful!

The information in this article is given for general interest. Someone with questions about using a medicinal clay should consult a doctor. Any clay that's used should be specifically prepared for human use and should be administered in the prescribed concentration and amount. This is especially important if it’s ingested. Clay collected from the environment may be harmful.

What Is Clay?

Clay deposits are made of minerals belonging to a family known as aluminum phyllosilicates."Phyllo" means that the minerals are arranged in leaf-like layers. Different types of clay contain different aluminum phyllosilicates.

Clay minerals come from weathered and eroded rocks. They exist as very fine particles that are less than two micrometers in size, according to the definition of "clay" in geology. A micrometer is a thousandth of a millimeter. The minerals may exist on their own or may be mixed with other materials in soil.

Most clay minerals can absorb a great deal of water and may swell as they do so. Many can also bind ions at their surface (a process known as adsorption) and then release the ions later when the environment changes. An ion is an electrically charged particle consisting of an atom or a group of atoms. Clay minerals tend to have negative charges, so many of the ions that they attract are metal ions, which are positive. In nature, opposite charges attract each other.

Geophagia Facts

The practice of eating clay is a type of geophagia. Geophagia, or geophagy, is the eating of materials that come from the earth, such as clay, chalk, or soil. Geophagia is in turn a type of pica, which is the ingestion of non-food substances.

Pica is usually considered to be abnormal and pathological. It may be a symptom of iron-deficiency anemia, for example. However, some scientists think that geophagia may at times be an adaptation to satisfy a nutritional need instead of being pathological.

More than two hundred species of animals are known to eat soil, including gorillas, chimpanzees, elephants, deer, and birds. Humans have eaten soil and especially clay since at least the time of Ancient Greeks.

Some pregnant women develop an urge to eat soil in the early stage of their pregnancy, often when they have morning sickness. Women in some cultures traditionally eat clay at this time. The reason why the women are attracted to the material is uncertain. It may provide minerals needed by the mother or fetus or it may remove toxins (and perhaps bacteria and viruses) that could hurt the fetus.

Eating untreated earth materials from nature may be dangerous due to the presence of contaminants.

Wild scarlet macaws eat clay.

Wild scarlet macaws eat clay.

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Clay Licks and Animals

A clay lick is an area that animals visit in order to feed on clay. Parrots in the Amazon basin are frequent visitors to the licks. There are many theories as to why they need to eat clay. One idea is that it provides nutrients that the birds lack, such as calcium, sodium, or iron. Another is that it detoxifies poisons in the seeds and unripe fruits that they eat.

There is evidence supporting the ideas that soil and clay can detoxify poisons in parrots and other animals. In the 1990s, Dr. James Gilardi observed that Peruvian parrots regularly fed on a particular patch of soil instead of on another patch nearby that contained more minerals. He decided to investigate the reason for this preference.

Gilardi performed an experiment in which he fed parrots a toxic substance called quinidine. Some of the parrots were also fed their favorite soil, while others weren't. Gilardi then tested the level of quinidine in the parrots' blood. The birds who had eaten the preferred soil had a sixty percent lower level of quinidine in their blood than the other birds. The amount of clay in the soil wasn't reported. Investigations of chimpanzees and baboons have shown that clay ingestion reduces toxin absorption in their bodies.

Humans use many different types of clay for medicinal and cosmetic purposes. Bentonite and kaolin are two clays that are used medicinally.

What Is Bentonite?

Bentonite is a clay produced by the weathering of volcanic ash. Its main componment is a mineral called montmorillonite. The two main types of bentonite are calcium bentonite, in which the dominant metallic ion is calcium, and sodium bentonite, which is rich in sodium ions.

Bentonite is used in the food processing industry to clarify liquids and as an ingredient in food packaging materials, so very tiny amounts enter most of our bodies on a regular basis.

Bentonite is not absorbed in the intestine and is a GRAS (Generally Recognized As Safe) substance when ingested in small amounts, according to an FDA report. It's important to note that while small to moderately small quantities of ingested bentonite are considered to be harmless, large quantities may be harmful.

Petrified Forest National Park, Arizona: the white strips are made of bentonite clay

Petrified Forest National Park, Arizona: the white strips are made of bentonite clay

Possible Health Benefits of Bentonite

In natural and alternative medicine, bentonite clay is often recommended for detoxification. Scientific evidence supporting this benefit is lacking, however. Just because some types of clay appear to prevent toxin absorption in a bird or another animal doesn't mean that bentonite does the same in humans, although this is a possibility. Even if bentonite is potentially useful for this purpose, researchers need to identify the concentration that is both effective and safe for removing toxins.

Bentonite is sometimes used as a laxative. Since it absorbs water and bulks up the contents of the intestine, it can trigger defecation. The amount of bentonite that is eaten is of critical concern, however. Bentonite may absorb so much water and swell to such a large extent that it blocks the intestine.

Anyone who is pregnant or who has a health problem should consult their doctor about the advisability of using medicinal clay.

Possible Dangers of Bentonite

Bentonite's powerful ability to absorb water is shown by the fact that bentonite cat litter can act as an intestinal obstruction if a pet dog decides to eat it. The litter may absorb liquids from swallowed food and from the digestive fluids, expanding and blocking the intestine.

A high dose of bentonite in our gut may absorb important nutrients, preventing us from using them. At higher concentrations, it interferes with vitamin A absorption in lab animals and hinders their growth. In addition, it can absorb the electrolytes that we need, such as potassium ions. It may also absorb medications, so it should be ingested at a different time from any other medicines.

Another reason why the clay may be dangerous is that it sometimes contains poisonous chemical impurities or microbes. The source and purity of a bentonite supplement are therefore very important.

It's also important that the dosage recommendation on a container of bentonite or any other medicinal clay isn't exceeded, even when a doctor agrees with its use. If the recommended dose doesn't help a health problem, it's time to visit the doctor again.

If you have a cat, make sure that the other pets in the house don't eat the cat's litter. Swallowed litter may absorb water, expand, and block the intestine.

If you have a cat, make sure that the other pets in the house don't eat the cat's litter. Swallowed litter may absorb water, expand, and block the intestine.

Antibacterial Clays

There is scientific evidence supporting some health benefits of clays. For example, researchers at Arizona State University have shown that at least some clays can kill bacteria in the lab.

The researchers made water extracts from four different types of clay to isolate the clay minerals. They then investigated the effects of the extracts on the MRSA bacterium and on Escherichia coli (or E. coli). MRSA, or methicillin-resistant Staphylococcus aureus, is resistant to common antibiotics, including methicillin. It's a serious problem in hospitals, care homes, and the general community. Although some strains of E. coli are helpful to humans, others can cause dangerous infections or cases of food poisoning.

The researchers found that metal ions attached to the clay minerals could kill bacteria. Their experiment showed that at certain concentrations copper, zinc, cobalt, and nickel ions killed E. coli. Copper, zinc and cobalt ions killed MRSA. In order for the metal ions to destroy the bacteria, however, the pH and temperature had to be suitable.

These results are very promising. The next step in the research is to see whether the clays have the same antibacterial benefits in living things and in situations outside the lab as they do in lab equipment.

Kaolin and Bleeding

An old belief is that clay can help wounds heal. Researchers have shown that in the case of at least one clay this claim is true. In fact, even the army is using gauze which is impregnated with the clay. The name of this very useful clay is kaolin and the gauze is called Combat Gauze. Combat Gauze is available for the general public as well as the military.

Kaolin helps blood to clot when someone is wounded, thereby preventing blood loss from the body. Blood clotting or coagulation is a normal process that happens when a person is wounded and blood vessels break. The blood must clot to prevent the person from bleeding to death and to prevent the entry of dangerous microbes into the body. Blood clotting happens via a chain of reactions called the coagulation cascade. Each reaction depends on the previous reaction in the chain in order to occur. Kaolin enters this cascade and triggers a vital step in the blood clotting process, which can cause clotting to occur more rapidly.

Kaolin is a clay containing a mineral called kaolinite.

Kaolin is a clay containing a mineral called kaolinite.

Kaolin and Diarrhea

Kaolin is used in some diarrhea medications because of its ability to absorb water. One popular brand of anti-diarrhea medication is Kaopectate. This used to contain kaolin and pectin but contains bismuth subsalicylate instead today. Kaolin continues to be used in some medications, however.

Kaolin may be helpful for diarrhea. Like bentonite, however, it may absorb certain nutrients and medications while in the gut. A combination of kaolin and pectin seems to be especially problematic in this respect.

Uncontaminated kaolin is considered to be safe when taken internally at specific concentrations. It isn't absorbed from the intestine into the bloodstream. It should be noted that while clays such as bentonite and kaolin are generally safe when eaten (as long as an excessive amount isn't ingested), chronic inhalation of a clay in the form of a dust can be dangerous.

A facial mask containing clay

A facial mask containing clay

Clay and Skin Care

Clay reportedly removes oil and impurities from the skin. It's also said to exfoliate the skin, removing old cells from the skin surface to reveal younger ones underneath. In addition, it's said to help acne. These are all wonderful claims, but there isn't much scientific evidence to support them at the moment. This doesn't mean that they aren't true, however.

Perhaps in the future scientists will show that clay has skin benefits. For now, it's important to read reviews written by people who've actually used a particular clay product to see if it's useful and to discover possible side effects. Preferably, the reviews shouldn't be located on the product's website or on a webpage where the writer earns money from promoting the product, unless this writer is highly respected. After this, personal experience will enable someone to discover if the product is helpful for their skin.

Bentoquatam Lotion

There is one clay product that has shown that it can be helpful for the skin. Bentoquatam lotion contains bentonite. It's used to create a protective shield over the skin before exposure to the irritating oils of poison ivy, poison oak, or poison sumac. The lotion doesn't help a rash that has already developed due to exposure to these plants, but it can stop one from forming.

A bentoquatam lotion needs to be applied about fifteen minutes before the first potential exposure to an irritant and then around every four hours after that. Someone using the lotion should follow the instructions on their product's container. The NIH reference given at the end of this article says that the lotion shouldn’t be applied to a rash that already exists and shouldn’t enter the eyes or mouth.

Further Studies Are Needed

It's possible that clay has many medicinal benefits and that many old and current beliefs about its value are true. We won't know this for certain until more research is done, however. The discoveries so far are very interesting. It certainly seems that this ancient remedy is worth investigating further. It's an intriguing material.


This content is accurate and true to the best of the author’s knowledge and does not substitute for diagnosis, prognosis, treatment, prescription, and/or dietary advice from a licensed health professional. Drugs, supplements, and natural remedies may have dangerous side effects. If pregnant or nursing, consult with a qualified provider on an individual basis. Seek immediate help if you are experiencing a medical emergency.

© 2013 Linda Crampton


Linda Crampton (author) from British Columbia, Canada on July 03, 2013:

Hi, W1totalk. Thanks for the visit and the comment.

W1totalk on July 03, 2013:

I did not know clay could be ingested and even more be used in many other ways to correct certain issues. Great article. Thank you.

Linda Crampton (author) from British Columbia, Canada on June 08, 2013:

Thank you very much, Rose. I appreciate your comment and vote!

rose-the planner from Toronto, Ontario-Canada on June 08, 2013:

Wow......this was very interesting! I had no idea of clay's medicinal properties. Very insightful, thank you for enlightening us. (Voted Up)


Linda Crampton (author) from British Columbia, Canada on June 08, 2013:

Thank you very much for the interesting comment, the vote and the share, vespawoolf! I was especially interested to read that people in Peru often drink certain medical clays in water. We may be missing out on a useful medicine here in North America!

Vespa Woolf from Peru, South America on June 08, 2013:

This is a very interesting and well-written Hub! I've benefited from certain clay masks, and here in Peru it's a common practice to drink certain types of medicinal clay dissolved in water for gastric issues such as gastritis. I've seen the Amazon basin parrots at their clay lick, as you mention here. Very informative! Voted up and shared.

Linda Crampton (author) from British Columbia, Canada on June 01, 2013:

Thank you very much for the comment and for sharing the interesting information, Seeker7! I appreciate the vote, too. The potential benefits of clay in medicine are very interesting. I'm looking forward to seeing what else researchers discover about the topic.

Helen Murphy Howell from Fife, Scotland on June 01, 2013:

Hi Alicia, another great hub and a very interesting one as well. I knew about some of these benefits but many were also knew to me. I was interested to read about the kaolin. I know this form the kaolin poultice - a very old remedy for healing infected and painful wounds. In the hospitals many years ago we used to have foil packs of kaolin poultices to have on hand should we need them - I don't actually know if they are still used at all.

A fascinating hub + voted up!

Linda Crampton (author) from British Columbia, Canada on May 29, 2013:

Thank you very much for the kind and interesting comment, as well as for the vote and the share, Nell! I appreciate your visit.

Nell Rose from England on May 29, 2013:

What a great hub Alicia, I do remember reading a few years ago that rats actually eat a lot of clay because of all the rubbish they ingest, and I have used kaolin in the past too. I do use the clay masks for my face, so this was fascinating, voted up and shared, nell

Linda Crampton (author) from British Columbia, Canada on May 29, 2013:

That's an interesting comment, Deb! Thank you for the visit.

Deb Hirt from Stillwater, OK on May 29, 2013:

Interesting! As kids in Maine, we frequently played with gray clay, and our cuts healed a lot faster, but it was a little gritty on the skin.

Linda Crampton (author) from British Columbia, Canada on May 29, 2013:

Thanks for the visit, poshcoffeeco. It is interesting that clay can be used for so many purposes!

Steve Mitchell from Cambridgeshire on May 29, 2013:

Like Sue Bailey I remember Kaolin & Morphine. Interesting to know about all the other uses for clay in medicine. I only thought it was used for making bricks for the building industry.

Linda Crampton (author) from British Columbia, Canada on May 28, 2013:

Hi, b. Malin. It's great to hear from you again! Clay does have some interesting uses. It might become even more useful in the future!

b. Malin on May 28, 2013:

Hi Alicia,

I've been away, but now finally, I'm back!

I've so missed reading you're always Wonderful and Informative Hubs and this one on "Clay" is no exception. So many uses, and benefits, and eating it, who knew? I did know about skin care, but not about the heeling of cuts and wounds. More research will yield, more useful Medical benefits. Thanks for sharing.

Linda Crampton (author) from British Columbia, Canada on May 28, 2013:

Thank you very much, drbj! It is interesting how animals "know" that clay will help them. This does make it seem likely that clay has some benefits for us, too.

drbj and sherry from south Florida on May 28, 2013:

If your title, Alicia, were 'Everything You Always Wanted to Know about Clay - and Then Some,' it would be perfectly appropriate. It's fascinating to me how some animals and birds eat clay instinctively for health benefits.

Linda Crampton (author) from British Columbia, Canada on May 28, 2013:

Thanks for sharing the interesting information, mperrottet, and thanks for the votes too. It would be great if clay has more medicinal uses!

Linda Crampton (author) from British Columbia, Canada on May 28, 2013:

Thanks for the votes, baja2013. Clay is a very versatile substance!

Margaret Perrottet from San Antonio, FL on May 28, 2013:

I know someone who is using clay to cleanse her system on the advice of her doctor. She suffered from lyme disease, and the clay is part of an alternative therapy that she's been on. Great hub - voted up, interesting and useful.

Bajazid from Sarajevo, Bosnia on May 28, 2013:

Voted useful and interesting. I like to play with clay. Used to make small houses and walls, different kind of blocks...

Linda Crampton (author) from British Columbia, Canada on May 27, 2013:

Thank you very much for the kind comment and the votes, Prasetio! I appreciate your visit.

prasetio30 from malang-indonesia on May 27, 2013:

Very informative hub, Alicia. I had never heard related about clay and skin care. Good job, my friend. You always be a good writer here and I always be your fans. Thank you very much for sharing with us. Voted up and useful :-)


Linda Crampton (author) from British Columbia, Canada on May 27, 2013:

Thank you very much, Bill. I appreciate the comment, the vote and the share, as always!

Bill De Giulio from Massachusetts on May 27, 2013:

Hi Alicia. This was really interesting. I had no idea of all the benefits of clay. You always mange to find the most interesting things to bring to us. Thanks so much for the education.

Voted up, shared, etc.....

Linda Crampton (author) from British Columbia, Canada on May 27, 2013:

Thanks for the visit, the comment and the votes, Tom!

Thomas Silvia from Massachusetts on May 27, 2013:

Hi my friend i know clay had been used for beauty treatments but no all these other great reasons. Well done !

Vote up and more !!!

Linda Crampton (author) from British Columbia, Canada on May 27, 2013:

Thank you very much, Bill!

Bill Holland from Olympia, WA on May 27, 2013:

I had absolutely no idea of the benefits of clay. What interesting information you always being us. Well done my friend.

Linda Crampton (author) from British Columbia, Canada on May 27, 2013:

Thank you very much for the comment and the vote, peachpurple. I appreciate your visit.

Linda Crampton (author) from British Columbia, Canada on May 27, 2013:

Thanks for the visit, Sue. It is interesting that clay has so many uses!

peachy from Home Sweet Home on May 27, 2013:

i didn't know clay has so many benefits. Best of all, it can be eaten! Thought that clay is being used for mask and making pottery only. Very insightful hub with lots of information that I yearn to know. Voted up

Susan Bailey from South Yorkshire, UK on May 27, 2013:

I had no idea clay had so many uses. I remember Kaolin and morphine for diarrhoea when I was a child though.

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