Subtotal $0.00
Shop Now
Bentonite clay is a soft, absorbent clay made mostly of a mineral called montmorillonite, formed from ancient volcanic ash. It is used in face masks, cat litter and drilling mud, and it is sold as a powder or capsule for drinking or swallowing, usually with “detox” claims. Those claims have little human evidence behind them: the few trials of edible clay tested a refined clay in people eating food contaminated with a mold toxin called aflatoxin, not everyday cleansing. Meanwhile, the FDA has warned consumers about bentonite products that contained elevated lead, and clay can bind medicines and minerals in the gut. Here is what bentonite is, what the research shows, and what to check before you use it.
Peptide Labs sells supplements that list bentonite, but this article does not recommend any of them. It is general information, not medical advice.
Key Takeaways
- Bentonite is a swelling clay formed from volcanic ash; most known deposits are in Wyoming.
- The FDA allows bentonite as a food processing aid that leaves no significant residue in foods.
- We found no human trials showing that bentonite removes "toxins" from healthy people.
- In 2016 the FDA warned consumers about two bentonite products after finding elevated lead.
- Clay can interfere with how other medicines are absorbed; pregnant women and children face added lead risk.
What is bentonite clay?
According to the Wyoming State Geological Survey, bentonite is a fine clay formed when volcanic ash settled into an ancient inland sea and broke down over millions of years. Geologically it is a montmorillonite-type clay, part of the smectite family, made largely of aluminum silicate. It was once called “soap clay”, and its modern name comes from rock layers named after Fort Benton, Montana. Wyoming holds about 70 percent of the world’s known deposits, and the clay is used in drilling mud, cat litter, foundry sand, animal feed binders and cosmetics.
Bentonite that is rich in sodium swells substantially when wet. Other forms are richer in calcium, and a refined calcium montmorillonite is the clay used in the research described below. In US food rules, bentonite is affirmed as generally recognized as safe (GRAS) for use as a processing aid, with no significant residue left in foods. That is very different from spooning clay into a drink every day.
Bentonite clay benefits: what the research shows
| Study | Who took part | What was measured | Limits |
|---|---|---|---|
| 2008 Ghana trial | 177 adults eating food with high aflatoxin levels, 3 months | Lower aflatoxin markers in blood and urine than placebo; side effects similar to placebo | One specific refined clay; one contaminant; no health outcomes |
| 2008 Ghana follow-up | Same adults | Vitamins A and E and nutrient minerals in blood unchanged | Short study; strontium rose |
| 2014 Ghana trial | Children, 2 weeks | Lower aflatoxin marker in urine; no adverse events linked to clay | Very short; same research group |
| Detox use in healthy people | No controlled trials found | Not applicable | Claims rest on lab binding tests and marketing |
The most-studied use of edible clay is narrow. Researchers from Texas A&M and Texas Tech ran a three-month placebo-controlled trial in Ghana with 177 adults whose staple foods carried high levels of aflatoxin. Capsules of NovaSil, a refined calcium montmorillonite, lowered aflatoxin markers in blood and urine compared with placebo, side effects were similar across groups, and blood levels of vitamins A and E and key minerals did not change. A short 2014 trial in Ghanaian children reported similar marker changes. These studies show that one purified clay can bind one food contaminant in the gut. They do not show that retail bentonite “pulls out” toxins in general.
Bentonite clay detox claims
Bentonite clay detox products usually claim to bind heavy metals, chemicals or parasites and carry them out of the body. Clay does bind many substances in a test tube, but we found no controlled human trials showing that bentonite clears toxins, improves health or aids weight loss in healthy people. The National Center for Complementary and Integrative Health (NCCIH) says there is no compelling research to support detox programs for weight management or for eliminating toxins, and that the FDA and FTC have acted against cleansing products with hidden ingredients or false disease claims. Your liver and kidneys already clear waste; our guides to colon cleanse supplements and liver cleanse supplements look at what similar products can and cannot do, and our parasite cleanse guide covers a related set of claims.
Can you eat bentonite clay?
You can find bentonite in supplements meant to be swallowed, and small amounts are allowed in food processing, but that does not make eating clay a good idea. Eating earth or clay, called geophagia, is a long-standing practice in parts of the world and has been documented in pregnancy. A 2014 review links it to iron deficiency and heavy-metal exposure, and a Boston review of 15 women with severe lead poisoning in pregnancy found that most cases came from eating soil, clay or pottery. If you crave clay or dirt, tell your clinician, because reviews list iron deficiency among the triggers.
Safety concerns: lead, medicines and minerals
FDA lead warnings
| Date | Product | What the FDA said |
|---|---|---|
| January 2016 | Bentonite Me Baby (Alikay Naturals) | Elevated lead found; marketed to be swallowed and applied to skin and hair; do not use |
| March 2016 | A bentonite clay powder from an Oklahoma company | Elevated lead found; sold to mix with water and drink or apply to skin; do not use |
| June 2016 | The same Oklahoma company | Warning letter; product had been promoted for detoxification |
Clays are dug from the ground and can carry lead and other metals. In both 2016 warnings, the FDA said lead can seriously damage the nervous system, kidneys and immune system, and that even low-level exposure in children is linked to lower IQ and behavior problems. Anyone who had used the products or given them to a child was told to see a health professional. The CDC adds that no safe blood lead level in children has been identified.
Binding medicines and minerals
The same absorbency that sellers advertise works on things you want to keep. France’s medicines agency notes that a clay medicine sold there can interfere with how quickly and how much of other medicines are absorbed, and its product information says to take other medicines at a separate time. In a reported case, a three-year-old given a bentonite home remedy by mouth and rectally developed dangerously low potassium; the doctors warned that large amounts of clay can bind electrolytes and possibly block the bowel. If you take any prescription medicine, ask your pharmacist before adding a clay product.
Pregnancy, breastfeeding and children
Lead passes from mother to baby through the placenta. In 2019, France’s medicines agency said that clays taken from soil can contain traces of lead; as a precaution, a common clay medicine should no longer be given to children under 2, and clay-based medicines are not recommended during pregnancy or breastfeeding. Do not give bentonite products to children, and talk to your clinician before using any clay product if you are pregnant or nursing.
Using bentonite on the skin
In masks and other cosmetics, bentonite works as an absorbent and thickener, and an expert panel of the Cosmetic Ingredient Review judged it safe as used in cosmetics. That panel did advise that sprays be formulated to limit inhaling the powder, since workers who breathe mineral dusts have developed lung damage. Mix dry powder gently and avoid breathing the dust. The 2016 FDA warnings covered products sold for skin as well as for swallowing, so lead testing matters either way.
Get medical care for severe constipation or belly pain, vomiting, muscle weakness or an irregular heartbeat after taking a clay product.
Reading labels that list bentonite
In supplements, bentonite usually appears as one ingredient inside a blend, often next to stimulant laxative herbs. Three products we carry show how it is listed:
- The Cleaner Detox Women’s 7 Day Formula lists bentonite in a proprietary blend with senna leaf extract, aloe vera gel and many botanicals. Its label carries a California Proposition 65 warning for lead, warns against use with diarrhea or abdominal pain, limits use to 7 days in a row unless a doctor directs, and is not for children under 12.
- Resciency Detox Binder combines bentonite with zeolite clay, activated charcoal, diatomaceous earth and algae. Its label notes that charcoal and clays can bind other substances and advises asking a healthcare professional about spacing it from medicines and other supplements.
- Inno Cleanse lists bentonite with fennel seed alongside cascara sagrada, cape aloe, senna and frangula, which have laxative effects. The label is for adults, directs use for up to 14 days at a time, and asks you to check with a professional first if you are pregnant, nursing or taking medication. Our cascara sagrada guide explains those laxative herbs.
None of these labels states the amount of bentonite in its blend. A third-party seal confirms that a product matches its label and meets contaminant limits set by the certifier; it does not show that the product works. Our guide to third-party tested supplements explains what to look for. You can compare related products in our detox and cleanse category.
Frequently Asked Questions
What is bentonite clay?
A soft clay made mostly of montmorillonite, formed from volcanic ash. It swells and absorbs water, which is why it is used in masks, cat litter and industrial products.
Can you eat bentonite clay?
It is sold in products meant to be swallowed, but there is little evidence of benefit, products have been found with elevated lead, and clay can bind medicines and minerals. Ask a clinician first.
Does bentonite clay detox your body?
There is no good human evidence that it does. The trials of edible clay looked at one refined clay and one food toxin, aflatoxin, in people with heavy exposure.
What are the main bentonite clay benefits?
Its proven uses are practical ones: absorbing oil and water in cosmetics and serving as a food processing aid. Claimed health benefits are largely unproven.
Is bentonite clay safe during pregnancy?
Talk to your clinician first. Clays can contain lead, which crosses the placenta, and France’s medicines agency does not recommend clay medicines during pregnancy or breastfeeding.
Can bentonite clay interact with medications?
Yes, it can. Clay can reduce or delay how other medicines are absorbed, so ask your pharmacist before combining them.
Questions about a label? Contact us or read our Buyer’s Guide. Follow the label and ask a healthcare provider before starting any supplement, especially if you take medicines. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: Colon Cleanse & Detox Supplements: What’s on the Label, Parasite Cleanse: What Doctors Say About Wormwood, Black Walnut and Clove, Third Party Tested Supplements: What USP, NSF and Other Seals Mean.