{"url":"https://whatshealthyandwhy.com/bentonite-clay/internal-and-external","path":"/bentonite-clay/internal-and-external","alternates":{"json":"https://whatshealthyandwhy.com/api/articles/bentonite-clay/internal-and-external.json","markdown":"https://whatshealthyandwhy.com/bentonite-clay/internal-and-external.md"},"topic":{"slug":"bentonite-clay","name":"Bentonite Clay","url":"https://whatshealthyandwhy.com/bentonite-clay"},"slug":"internal-and-external","order":1,"title":"Internal and external uses of bentonite clay","question":"Does bentonite clay detox your body?","answer":"Bentonite clay may bind certain mold toxins in the gut, but general detox and heavy-metal claims are unproven in people.","description":"How montmorillonite clay binds toxins through electrical charge, and its applications for gut health, skin, and detox","confidence":2,"confidenceNote":"One trial in rats and humans (fumonisin biomarkers), dairy cow studies and a review; heavy-metal binding is shown only in the lab.","evidenceSummary":{"metaAnalysisCount":0,"replicated":false,"newestStudyYear":2015},"category":{"categoryTitle":"Detox & Heal","categorySlug":"detox-and-heal","subcategoryName":"Binders & Tools","subcategorySlug":"binders","url":"https://whatshealthyandwhy.com/explore/detox-and-heal/binders"},"actions":["Choose food-grade calcium bentonite, the form used in the human trial [1], with third-party testing for contaminants such as lead.","Start with a quarter teaspoon in water, increase gradually, and drink plenty of water to limit constipation.","For skin, mix clay with water or apple cider vinegar as a mask; sodium bentonite is the form suited to external use."],"cautions":["It can cause significant constipation, especially if you are already prone to it, and it absorbs fluid, so drink plenty of water.","Avoid swallowing sodium bentonite: it swells up to 15 times its dry volume and is the industrial form used in drilling mud and cat litter."],"simpleText":"Bentonite clay — specifically montmorillonite — is a naturally occurring clay formed from volcanic ash. What makes it useful for health applications is its unique structure: the clay particles carry a strong negative electrical charge that attracts and binds positively charged substances, including heavy metals, mycotoxins, and certain bacterial toxins [3]. When hydrated, the clay swells and creates a large surface area, increasing its binding capacity.","mediumText":"Internal uses\n\nHeavy metal and mycotoxin binding\n\nBentonite clay's best-studied internal application is aflatoxin binding. Animal studies — particularly in dairy cows — have consistently shown that adding montmorillonite clay to feed significantly reduces aflatoxin levels in milk [2][4]. A landmark human trial in Ghana demonstrated that calcium montmorillonite clay reduced urinary biomarkers of fumonisin B1 (a common grain mycotoxin) in people living in high-exposure areas [1].\n\nFor heavy metals, the mechanism is straightforward: metal ions like lead, cadmium, and mercury carry positive charges, making them targets for the clay's negative charge [3]. However, most human evidence for heavy metal binding specifically is still preclinical. The clay does bind these metals effectively in laboratory conditions — translating that to clinical outcomes is where more research is needed.\n\nGut detox and digestive support\n\nSome integrative practitioners recommend small amounts of food-grade bentonite clay for general gut detoxification — the theory being that it can bind endotoxins and irritants in the GI tract. This is plausible based on its known binding properties, but rigorous clinical trials for general \"gut detox\" are sparse.\n\nStart slow. Bentonite clay can cause significant constipation, especially in people who are already prone to it. Begin with a quarter teaspoon in water and increase gradually. Always drink plenty of water when taking clay internally, as it absorbs fluid.\n\nExternal uses\n\nFace masks and skin detox\n\nBentonite clay mixed with water or apple cider vinegar is one of the most popular natural face masks. The clay draws oils, dirt, and impurities from pores through the same adsorption mechanism that works internally. It also has mild antimicrobial properties [3].\n\nDrawing out infections\n\nTraditional use of clay poultices for drawing out splinters, insect venom, and superficial skin infections has a long history across cultures. The binding action can help pull irritants from the skin surface, and the clay's antimicrobial properties may offer modest additional benefit [3].","deepText":"Calcium bentonite vs sodium bentonite\n\nNot all bentonite is interchangeable. Calcium bentonite is generally recommended for internal use — it swells less dramatically, is considered gentler on the digestive system, and is the form used in the human clinical trials [1]. Sodium bentonite swells much more when hydrated (up to 15 times its dry volume), which makes it excellent for external poultices and masks but potentially problematic when ingested. It is also the industrial form used in drilling mud and cat litter — definitely not what you want to consume.\n\nWhen purchasing for internal use, look for \"food grade calcium bentonite clay\" that has been tested for contaminants. Clay sourced from the earth can naturally contain trace amounts of lead and other heavy metals, so third-party testing is important. Reputable brands will provide certificates of analysis.\n\nWhat the evidence actually supports\n\nThe strongest evidence for bentonite clay is in mycotoxin binding, particularly aflatoxins, supported by both animal and human data [1][2][4]. Heavy metal binding is mechanistically sound and demonstrated in vitro but lacks robust human clinical trials. General \"detox\" claims are largely extrapolated from the known binding properties rather than directly proven in humans. External uses for skin are well-supported by traditional use and the clay's established physical properties, even if large clinical trials are lacking.","deepTruncated":false,"references":[{"id":"1","title":"Calcium montmorillonite clay reduces urinary biomarkers of fumonisin B₁ exposure in rats and humans","authors":"Robinson A, Johnson NM, Strey A, Taylor JF, Marroquin-Cardona A, Mitchell NJ, et al.","year":2012,"journal":"Food Additives & Contaminants: Part A","pmid":"22324939","url":"https://pubmed.ncbi.nlm.nih.gov/22324939/"},{"id":"2","title":"Aflatoxin binders II: reduction of aflatoxin M1 in milk by sequestering agents of cows consuming aflatoxin in feed","authors":"Diaz DE, Hagler WM Jr, Blackwelder JT, Eve JA, Hopkins BA, Anderson KL, et al.","year":2004,"journal":"Mycopathologia","pmid":"15119861","url":"https://pubmed.ncbi.nlm.nih.gov/15119861/"},{"id":"3","title":"Past, present and future of clay minerals as potential therapeutic agents","authors":"Ghadiri M, Chrzanowski W, Rohanizadeh R","year":2015,"journal":"Journal of Applied Clay Science"},{"id":"4","title":"Efficacy of Solis, NovasilPlus, and MTB-100 to reduce aflatoxin M1 levels in milk of early to mid lactation dairy cows fed aflatoxin B1","authors":"Kutz RE, Sampson JD, Pompeu LB, Ledoux DR, Spain JN, Vázquez-Añón M, et al.","year":2009,"journal":"Journal of Dairy Science","pmid":"19620679","url":"https://pubmed.ncbi.nlm.nih.gov/19620679/"}],"wordCount":589,"source":{"path":"src/content/topics/bentonite-clay/internal-and-external.md"},"citeAs":"“Does bentonite clay detox your body?.” What's Healthy and Why. https://whatshealthyandwhy.com/bentonite-clay/internal-and-external","notice":"General information backed by peer-reviewed research, not medical advice."}