Diosmectite (Smectite): What the Sources Say and Safety
Diosmectite (smectite) is a clay medicine for acute diarrhea: what trials show for children, why it is not a detox, and the lead and under-2 cautions.
Content last updated . This page has not been medically reviewed.
What is Diosmectite (Smectite) 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.
Acute diarrhea in children, added to rehydration
Clinically supportedA 2018 Cochrane review of 18 trials (2,616 children) found smectite may shorten diarrhea by about 24 hours and raise the chance of cure by day 3 (risk ratio 2.10), with low-certainty evidence; 8 trials were manufacturer-funded.
Supplements: A defined medical use (swallowed smectite with rehydration in children), low certainty; does not transfer to cosmetic clay or wellness use.
Hospital stays, IV fluids and stool frequency
Not enough evidenceCochrane found smectite may not reduce hospitalization (low certainty), probably does not reduce IV rehydration (moderate certainty), and the effect on stool frequency is very uncertain.
Supplements: No clear benefit shown on these outcomes.
Guidelines disagree
Preliminary or mixedOf 15 children's diarrhea guidelines, 4 judged smectite useful, 5 did not recommend it and 6 did not address it; a 2009 review notes WHO did not recommend it for routine use.
Supplements: Mixed professional opinion.
Adults with long-term diarrhea
Not enough evidenceA 5-week study in 35 adults with functional chronic diarrhea found diosmectite did not change gut bacteria; it did not test whether symptoms improved.
Supplements: Insufficient evidence.
Detox claims: not what this medicine is for
Not enough evidenceSellers of clays say swallowing them removes toxins; NCCIH reports a 2015 review that found no compelling research that detox diets remove toxins, and diosmectite is studied only for diarrhea.
Supplements: No good evidence of benefit for detox.
Connected topics
Open a group to see how each topic connects and how strong the evidence is.
Health goals (1)
- Digestive SupportClinically supported
May shorten acute diarrhea in children when added to rehydration (low-certainty Cochrane evidence).
Body systems (2)
- Digestive SystemClinically supported
A medical use for acute diarrhea; evidence is low certainty.
- Gut HealthClinically supported
Used for acute diarrhea in children, with low-certainty evidence.
Body parts (1)
- GutClinically supported
Acts in the gut and is described as not absorbed into the body.
Functional actions (1)
- Digestive SupportClinically supported
Anti-diarrheal adjunct to rehydration in children.
Root causes (3)
- Heavy Metal ExposureDocumented risk
Trace natural lead is the reason for age limits in France and Singapore.
- Medication Side EffectsDocumented risk
Adsorbs other oral drugs; spacing of 60 to 90 minutes is advised in a review.
- Digestive DysfunctionClinically supported
Acute infectious diarrhea is the studied problem.
Conditions & symptoms (2)
- Acute GastroenteritisClinically supported
Guidelines are split: 4 of 15 judged smectite useful and 5 did not recommend it.
- DiarrheaClinically supported
May shorten acute diarrhea in children with rehydration (low-certainty Cochrane evidence); rehydration is the mainstay.
Documented risks and interactions (5)
- Trace lead in the natural clay. France's ANSM says clay from soil can contain naturally occurring lead; a 5-week maker study in adults found no rise of lead in blood, risk cannot be ruled out in children under 2, and ANSM knows of no lead poisoning cases linked to the product. Singapore's HSA says the same about trace lead.
- Not advised under age 2 (France), restricted in Singapore. Since 2019 French regulators advise against diosmectite in children under 2 as a precaution and prefer oral rehydration solution; Singapore restricted use to age 2 and older and adults in 2020.
- Pregnancy and breastfeeding. French and Singapore regulators do not recommend diosmectite in pregnancy or breastfeeding, as a precaution because of the lack of data.
- Binds other medicines in the gut. A 2009 review says that because of its adsorbent properties other oral drugs, including antibiotics, should be given 60 to 90 minutes apart from diosmectite.
- Side effects: constipation, vomiting, taste. Cochrane found no deaths or serious adverse events; minor effects such as constipation, vomiting and bad taste did not differ between groups. Up to 20 percent of children in one trial did not comply, mainly because of taste.
The short answer: in a Cochrane review, smectite given with rehydration may shorten children's diarrhea by about a day, but the evidence is low certainty, and French regulators advise against the diosmectite medicine under age 2 and in pregnancy because clay can carry trace lead. [1][3] It is a medicine for acute diarrhea, not a "detox" product.
Diosmectite is a purified natural clay used in some countries as a diarrhea medicine. This page separates the trial results from marketing claims and keeps the medical use apart from clay sold for beauty or wellness. Do not give any clay product to a child without a clinician's advice.
What diosmectite is
Diosmectite is a natural aluminomagnesium silicate clay from the smectite family, used as a medicine for acute diarrhea in children. [2] It is sold as a powder in sachets in several countries (a well-known brand is Smecta). It is not the same product as a cosmetic montmorillonite or bentonite clay; see Montmorillonite clay. Natural clay from the ground contains trace amounts of lead. [4] In France, other clay medicines (attapulgite, montmorillonite, kaolin, hydrotalcite) are reserved for adults. [3]Claims and what the sources found
| Claim or use | What the best source found | Evidence label | Route, product and who was studied |
|---|---|---|---|
| Shortens acute diarrhea in children | A 2018 Cochrane review of 18 trials (2,616 children) found smectite may shorten diarrhea by about 24 hours and may raise the chance of cure by day 3 (risk ratio 2.10). Certainty was low. Eight trials were funded by manufacturers. [1] | Promising but limited | Swallowed smectite with rehydration; children aged 1 month to 18 years |
| Reduces hospital stays or the need for IV fluids | Smectite may not reduce hospitalization (low certainty) and probably does not reduce IV rehydration (moderate certainty). [1] | No good evidence of benefit | Same trials |
| Fewer bowel movements | The effect on stool frequency is very uncertain; stool output may fall slightly. [1] | Insufficient evidence | Same trials |
| Recommended by guidelines | A comparison of 15 children's diarrhea guidelines found smectite judged useful in 4, not recommended in 5, and not addressed in 6. [5] A 2009 review notes WHO did not recommend it for routine use, citing cost and the success of rehydration. [2] A 2013 systematic review said smectite or racecadotril is an effective add-on to oral rehydration. [10] | Mixed | Guideline reviews |
| Helps adults with long-term diarrhea | A study in 35 adults with functional chronic diarrhea who took diosmectite for 5 weeks looked at gut bacteria and found no change. [7] That is not a test of whether it helps symptoms. Proper evidence of benefit not found in the sources we read. | Insufficient evidence | Adults; microbiome outcome only |
| "Detoxes" or "removes toxins" | NCCIH reports a 2015 review that found no compelling research that detox diets remove toxins. [9] The clay is studied for diarrhea only. | No good evidence of benefit | Swallowed; healthy adults |
Limits: many trials were small, open-label or funded by makers, the Cochrane search ran to June 2017, and a 2009 review of the clay was supported by its manufacturer. [1][2] Newer Chinese trials compare smectite plus a probiotic with smectite alone, which tells us about the probiotic rather than the clay. [8]
Safety by group
- Swallowing and poisoning. The Cochrane review found no deaths or serious adverse events, and minor effects such as constipation, vomiting and a bad taste did not differ between groups. [1] A 2009 review notes that up to 20% of children in one trial did not comply, mainly because of taste. [2] If someone swallowed more than directed and is unwell, call Poison Help at 1-800-222-1222 (US) or your local emergency number. [6]
- Lead. France's medicines agency says clay from soil can contain naturally occurring lead. The maker's 5-week study in adults found no lead rising in the blood, but this cannot be ruled out in children under 2. The agency knows of no lead poisoning cases linked to the product. [3] Singapore's regulator says the same about trace lead and a 5-week adult study. [4] See Heavy metals in natural ingredients.
- Babies and young children. Since 2019, French regulators advise against diosmectite under age 2 and say oral rehydration solution is the reference treatment. [3] Singapore restricted acute-diarrhea use to children 2 and older and adults in 2020. [4] Rehydration matters most; see Oral rehydration solutions.
- Pregnancy and breastfeeding. French and Singapore regulators do not recommend it, as a precaution because data are lacking. [3][4]
- Medicines. Because the clay adsorbs, a 2009 review advises giving other oral drugs, including antibiotics, 60 to 90 minutes apart. [2] Ask a pharmacist; see Medication interactions.
- Dehydration. Diarrhea in a baby or young child, blood in the stool, high fever, or signs of dehydration need a clinician. The 2009 review says diosmectite is an adjunct to rehydration, not an alternative or a substitute for antibiotics where needed. [2]
- Kidney, heart, skin and breathing. The sources we read do not describe them for diosmectite.
How it is used and what to look for on a label
- In some countries it is a pharmacy medicine. Medicine labels give a licensed use, age limit and warnings; cosmetic or supplement clay does not.
- Do not substitute a bentonite or "healing clay" from a shop.
- Red flags: "detox", "heavy metal removal", or no age or pregnancy warning.
- See Diarrhea and Detox claims checked.
Related pages
Frequently asked questions
Does diosmectite work for diarrhea?
A Cochrane review found smectite may shorten children's diarrhea by about 24 hours, with low certainty, and it does not appear to cut hospital stays. [1] Rehydration remains the main treatment. [2]
Is diosmectite a detox?
No source we read supports that. It is studied as a diarrhea medicine. NCCIH reports a 2015 review that found no compelling research that detox diets remove toxins. [9]
Is it safe for babies?
French regulators advise against it under age 2 because of possible trace lead, and prefer oral rehydration solution. [3] Ask a clinician.
Is it safe in pregnancy?
French and Singapore regulators do not recommend it in pregnancy or breastfeeding, as a precaution. [3][4]
Can I take it with other medicines?
A review advises spacing other oral medicines by 60 to 90 minutes. [2] Ask a pharmacist.
References
- Cochrane. Smectite for acute infectious diarrhoea in children (CD011526). Published April 2018. Systematic review. Read 2026-10-24.
- Dupont C, Vernisse B. Anti-diarrheal effects of diosmectite in the treatment of acute diarrhea in children: a review. Paediatr Drugs. 2009;11(2):89-99. Narrative review, manufacturer-supported. Read 2026-10-24.
- ANSM (France). Médicaments à base d'argile dans le traitement symptomatique de la diarrhée aigüe chez l'enfant. Published 28 Feb 2019, updated 16 Mar 2021. Read 2026-10-24.
- Health Sciences Authority (Singapore). Smecta: restriction of treatment of acute diarrhoea to children 2 years of age and adults and recommendation against use in pregnant and breastfeeding women. Letter dated 9 March 2020. Read 2026-10-24.
- Lo Vecchio A, et al. Comparison of Recommendations in Clinical Practice Guidelines for Acute Gastroenteritis in Children. J Pediatr Gastroenterol Nutr. 2016;63(2):226-235. Guideline review. Read 2026-10-24.
- Poison Control (America's Poison Centers). Poison Control. Read 2026-10-24.
- Da Silva K, et al. Long-term diosmectite use does not alter the gut microbiota in adults with chronic diarrhea. BMC Microbiol. 2022. PubMed 35151268 (abstract read via Europe PMC). Read 2026-10-24.
- Li T, McFarland LV. Saccharomyces boulardii CNCM I-745 and smectite treatment for pediatric acute gastroenteritis in China. Front Pediatr. 2026. PubMed 41798274 (abstract read via Europe PMC). Meta-analysis. Read 2026-10-24.
- National Center for Complementary and Integrative Health (NIH). “Detoxes” and “Cleanses”: What You Need To Know. Updated March 2025. Read 2026-10-24.
- Pieścik-Lech M, et al. Review article: the management of acute gastroenteritis in children. Aliment Pharmacol Ther. 2013;37(3):289-303. PubMed 23190209 (abstract read via Europe PMC). Systematic review. Read 2026-10-24.