Fuller's Earth: What the Sources Say and Safety
Fuller's earth: an adsorbent clay used in industry and in chemical-skin-decontamination research; what we found on face-mask and detox claims, paraquat, and dust and metal cautions.
Content last updated . This page has not been medically reviewed.
What is Fuller's Earth good for?
What the body uses it for, and how strong the evidence is. A normal job in the body is not proof that extra supplements add benefit; each card says which.
Skin decontamination after chemical exposure
Lab or animal research onlyIn pigs exposed to sulfur mustard or the nerve agent VX, fuller's earth was highly effective and similar to a reactive skin lotion; use was still worthwhile if delayed up to 30 minutes (mustard) or 2 hours (VX). An earlier swine study found it slightly less effective than the lotion against mustard skin injury.
Supplements: Applies to emergency decontamination formulations, not to cosmetic masks.
Water suspensions versus dry powder (lab work)
Lab or animal research onlyLab tests on pig and human skin samples found fuller's earth suspensions worked as well as dry powder against an organophosphate (paraoxon). A porcine test recovered about 90% of a tracer chemical with a suspension versus 54% with water alone.
Supplements: Lab and animal only.
Face masks and oily skin: seller claims
Not enough evidenceFuller's earth is sold as a mask for oily skin and acne. We found no human trial for this use.
Supplements: Proper evidence not found in the sources we read.
Swallowed to adsorb poison (paraquat): hospital use only
Not enough evidenceA 2017 case report lists fuller's earth with gastric lavage and activated charcoal as early adsorbents in paraquat poisoning, citing no study for it. This is hospital care given by clinicians.
Supplements: Do not self-treat; call Poison Help (US 1-800-222-1222) or your local emergency number.
'Detox' and 'pulls out toxins': claim check
Not enough evidenceSellers say clay detoxes the body. NCCIH reports a 2015 review found no compelling research that detox diets remove toxins; no human study of fuller's earth for detox was found.
Supplements: No good evidence of benefit.
Cosmetic safety reviews
Clinically supportedCIR (2003) concluded fuller's earth and related silicates were safe as currently used in cosmetic formulations and advised sprays be made to limit inhalation. The 2026 update on eight clays found them safe as used except for inhaled products; we could not confirm fuller's earth is among the eight.
Supplements: Applies to cosmetic use as reviewed; not to swallowing.
Connected topics
Open a group to see how each topic connects and how strong the evidence is.
Body systems (1)
- Integumentary SystemLab or animal research only
Skin decontamination work in animals and skin samples only.
Body parts (2)
Root causes (2)
- Environmental ToxinsLab or animal research only
Emergency skin decontamination after chemical agents in pigs; not a daily detox.
- Heavy Metal ExposureDocumented risk
The material itself can contain heavy metal particles; cosmetic clays have shown mercury.
Conditions & symptoms (1)
- PneumoconiosisDocumented risk
CIR records pneumoconiosis in workers who mined or processed several related silicate minerals from heavy dust exposure.
Documented risks and interactions (4)
- Swallowing: poison centers. The sources we read give no poison-center case data for swallowed fuller's earth.
- Breathing the dust. CIR says inhalation toxicity of these silicates is readily shown in animals, and fibrosis and pneumoconiosis occurred in workers who mined or processed several related minerals. Its 2026 update found data insufficient for products that may be incidentally inhaled.
- Heavy metal particles and contamination. A 2022 paper describes fuller's earth as non-uniform, with clay aggregates and heavy metal particles. A 2025 survey found mercury in every cosmetic clay it tested; fuller's earth was not named in the abstract.
- Binds medicines in the gut. Adsorbent clays can bind other substances, but the sources we read did not describe medicine interactions for fuller's earth.
The short answer: fuller's earth has a real, narrow, emergency use (skin decontamination after chemical exposure, tested in labs and pigs), but we found no human trial for face masks, "detox" or swallowing. [5][6][7] Do not swallow it as a home remedy. If someone has swallowed a clay or other product and is unwell, call Poison Help at 1-800-222-1222 or use the online tool, and call 911 for collapse, seizure or trouble breathing. [1]
This page keeps seller claims, laboratory and animal findings, and human reports apart, and keeps skin use apart from swallowing.
What fuller's earth is
Fuller's earth is a name for a group of absorbent clays, not one exact mineral. A 2022 laboratory paper describes it as a phyllosilicate (a layered clay) used as a powder for household or skin decontamination, and as a mix that is not uniform: it contains clay aggregates and heavy metal particles. [8] The sources we could open did not give its exact mineral makeup, and the makeup varies from deposit to deposit. The Cosmetic Ingredient Review (CIR) lists it as its own ingredient next to attapulgite, bentonite, kaolin and montmorillonite. [3] Grades matter: medical or military decontamination products are special formulations, not the same as a skin-care or industrial powder. [5]Claims and what the sources found
| Claim or use | What the best source found | Evidence label | Route, product and who was studied |
|---|---|---|---|
| Skin decontamination after chemical agents | In pigs exposed to sulfur mustard or the nerve agent VX, fuller's earth was highly effective, similar to a reactive skin lotion; use was still worthwhile if delayed up to 30 minutes (mustard) or 2 hours (VX). [6] An earlier swine study found it worked well but slightly less than the lotion against mustard skin injury. [7] | Lab or animal only | Pig skin; military-type formulations; not human trials |
| Better decontamination as a water suspension | Lab tests on pig and human skin samples found suspensions worked as well as dry powder against an organophosphate (paraoxon), with weak cell toxicity only at the highest strength. [8] A porcine test found a suspension recovered about 90% of a tracer chemical versus 54% for water alone. [5] | Lab or animal only | Skin samples and cells; chemical tracers |
| Swallowed to absorb poison (for example the weed killer paraquat) | A 2017 case report lists fuller's earth with gastric lavage and activated charcoal as early adsorbents, and cites no study for it. [9] Hospital use only; Proper evidence not found in the sources we read for a trial result. | Insufficient evidence | Hospital poisoning care; one case report |
| Face mask for oily skin or acne | Seller and traditional claim. Proper evidence not found in the sources we read (we searched Europe PMC for fuller's earth studies and found only decontamination and industrial work). | No good evidence of benefit | Cosmetic mask; no human study found |
| "Detox", "pulls toxins from the body" | NCCIH reports a 2015 review that found no compelling research that detox diets remove toxins. [2] No human study of fuller's earth for this was found. | No good evidence of benefit | Seller claim |
| Safe in cosmetics | CIR's 2003 report concluded fuller's earth and related silicates were safe as currently used in cosmetic formulations and said sprays should be made to limit inhalation. [3] Its 2026 update on eight clays found them safe as used, but data were insufficient for products that may be breathed in; we could not tell from the abstract whether fuller's earth was among the eight. [4] | Established for cosmetic use as reviewed | Cosmetic products, expert panel review |
Limits: the decontamination work is mostly pig and skin-sample work, uses special formulations, and cannot be applied to a kitchen-cupboard mask. The paraquat note is one case report with no trial behind it.
Safety by group
- Swallowing and poisoning. The sources we read do not describe poison-center cases of swallowed fuller's earth. In hospital poisoning care it is given only by clinicians. [9] Do not self-treat; call Poison Help (US 1-800-222-1222) or your local emergency number. [1] See Urgent help for poisoning and Activated charcoal and poisoning.
- Contamination. A 2022 paper says fuller's earth contains heavy metal particles. [8] A 2025 Polish survey found mercury in every cosmetic clay tested (1.87 to 200.81 micrograms per kilogram), though fuller's earth was not named in the abstract. [10] We found no metal test of a skin-care fuller's earth. See Heavy metals in natural ingredients.
- Medicines. The sources we read do not describe interactions with medicines. Clays can bind other substances, so ask a pharmacist; see how interactions work.
- Skin. The sources we read give no irritation or allergy rates. In a cell and zebrafish-embryo test, only the strongest suspension (15%) showed weak toxicity. [8] Patch test first; see Clay face masks: safety and patch testing.
- Breathing. CIR says inhalation toxicity of these silicates is readily shown in animals, and that miners and processors of several related minerals developed lung fibrosis and pneumoconiosis from heavy dust exposure. [3] CIR's 2026 update found data insufficient for products that may be incidentally inhaled. [4] Avoid breathing the dry powder.
- Pregnancy, breastfeeding, babies and children. Not described for fuller's earth in the sources we read. Keep powders away from children. For eaten clays in pregnancy see Eating clay (geophagy).
- Kidney and heart conditions: not described in the sources we read.
How it is used and what to look for on a label
- Industrial and household uses exist, but the sources we read did not cover them.
- Skin care: face-mask powders.
- Medical and military: skin decontamination products. [5][6]
- Look for the grade stated clearly; avoid industrial-grade material on skin. A "toxin-removing" claim is a red flag.
Related pages
Frequently asked questions
Does fuller's earth detox the body?
We found no human study showing it does. NCCIH reports a 2015 review that found no compelling research that detox diets remove toxins. [2] Its proven-in-the-lab use is for skin decontamination after chemical exposure, which is a different thing. [6]
Is fuller's earth safe to swallow?
We do not advise it. A case report lists it as a hospital adsorbent for paraquat poisoning, given by clinicians. [9] If someone has swallowed it and is unwell, call Poison Help at 1-800-222-1222. [1]
Is it safe on the face?
CIR judged it safe as used in cosmetics in 2003, with a caution about breathing sprays and dusts. [3] We found no trial of fuller's earth masks for oily skin or acne, and no data on patch-test reactions.
Can I use it if I am pregnant or for a child?
The sources we read do not say. Ask a clinician, and keep powders out of children's reach.
Does it contain metals?
A 2022 paper describes fuller's earth as containing heavy metal particles. [8] We found no source measuring metals in skin-care products.
References
- Poison Control (America's Poison Centers / National Capital Poison Center). Poison Control home page. Read 2026-10-24.
- NCCIH (US National Institutes of Health). Detoxes and Cleanses: What You Need To Know. Last updated March 2025. Read 2026-10-24.
- Elmore AR; Cosmetic Ingredient Review Expert Panel. Final report on the safety assessment of aluminum silicate ... attapulgite, bentonite, Fuller's earth ... kaolin ... montmorillonite ... and zeolite. Int J Toxicol. 2003;22(Suppl 1):37-102. Record summary read 2026-10-24.
- Burnett CL, et al. (Expert Panel for Cosmetic Safety / CIR). Amended Safety Assessment of Naturally-Sourced Clays as Used in Cosmetics. Int J Toxicol. 2026. PubMed 42313106 (abstract read). Read 2026-10-24.
- Roul A, et al. Comparison of four different fuller's earth formulations in skin decontamination. J Appl Toxicol. 2017. PubMed 28745436 (abstract read). Lab and porcine skin. Read 2026-10-24.
- Dachir S, et al. Skin decontamination efficacy of sulfur mustard and VX in the pig model: fuller's earth and RSDL. Chem Biol Interact. 2021. PubMed 33508307 (abstract read). Pig study. Read 2026-10-24.
- Taysse L, et al. Skin decontamination of mustards and organophosphates: RSDL and fuller's earth in domestic swine. Hum Exp Toxicol. 2007. PubMed 17370872 (abstract read). Swine study. Read 2026-10-24.
- Danoy A, et al. Aqueous suspensions of fuller's earth potentiate the adsorption capacities of paraoxon and improve skin decontamination properties. J Hazard Mater. 2022. PubMed 34896712 (abstract read). Lab study. Read 2026-10-24.
- Janeela MA, et al. Paraquat poisoning: case report of a survivor. J Family Med Prim Care. 2017;6(3):672-673. Case report. Read 2026-10-24.
- Fischer A, et al. Analysis of Mercury Concentration in Cosmetic Clays. Toxics. 2025. PubMed 40559980 (abstract read). Read 2026-10-24.