Eating Clay (Geophagy): What the Sources Say and Safety

Safety first: eating clay or soil is linked in studies to lower iron levels, lead exposure and worm infections, so it is worth telling a clinician about. In a Tanzanian study of 530 pregnant women, women who ate soil had lower ferritin (a stored-iron marker) and lower hemoglobin in each trimester. [4] A Nigerian scoping review found 92.3 percent of the clay samples tested were above the WHO lead limit it used. [3] If someone has swallowed clay and is unwell, call Poison Help at 1-800-222-1222 or use the online tool, and call 911 for collapse, seizure, trouble breathing or if the person cannot be awakened. [1] See Poisoning: what to do first.

Geophagy (say jee-OFF-uh-jee) means eating clay, earth or soil. It is a cultural practice in many places and also a form of pica, the habit of eating non-food items. This page does not judge anyone. It separates traditional reasons, lab and field measurements, and human studies, and it does not give swallowing instructions.

What eating clay (geophagy) is

People eat many materials: kaolin-type clays, lumps of dried earth, termite-mound soil and, in some regions, chalks and salts such as trona or natron. [3] MedlinePlus describes pica as eating non-food items, including clay, and says it can happen in pregnancy; a lack of nutrients such as iron or zinc may trigger the cravings. [5] Whether pregnancy causes the behavior, or clay is one of the cravings of pregnancy, is not settled in the sources we read. Materials differ by region and by seller, so a result for one clay does not carry over to another. See Clay types at a glance.

Claims and what the sources found

Limits: most data are observational, from surveys, small cohorts and sample measurements, and clay samples are not the same as what an individual ate. A Tanzanian cohort can show a link but not which came first. [4]

Safety by group

• Swallowing. MedlinePlus lists stomach or intestinal blockages (bezoars), infection and lead poisoning among complications of eating non-food items, with belly pain, nausea, bloating and fatigue as symptoms. [5] Call Poison Help for a swallowed product that causes symptoms. [1]
• Contamination. In the Nigerian review, 92.3 percent of clay samples exceeded a WHO lead limit (0.1 mg/kg), 42.9 percent exceeded a cadmium limit (0.3 mg/kg), and for arsenic 82.3 percent of reporting studies exceeded an EFSA limit (3 mg/kg); some child hazard quotients exceeded 1. [3] A Ghana review reports toxic metals above international limits, higher metal release under stomach conditions, microbes and naturally occurring radionuclides. [6] See Heavy metals in natural ingredients.
• Blood lead. In 1,056 pregnant women in northwestern Tanzania, geophagy was linked to 22 percent higher blood lead levels; living in a gold-mining area was linked to 33.4 percent higher. [7] This is cross-sectional, so it shows a link, not cause.
• Worms and infection. In 404 pregnant women in Eastern Ethiopia, geophagy was linked to soil-transmitted worm infection (adjusted odds ratio 2.9, 95 percent CI 1.6 to 5.4). [10] A single stool test may have underestimated infection. [10]
• Iron and folate. In the Tanzanian cohort, soil-eating was linked to lower ferritin and hemoglobin in each trimester and lower folate in the third trimester. [4] See Iron deficiency and iron deficiency anemia.
• Medicines. The sources we read do not describe interactions with eaten clay. Clays can bind other substances; ask a pharmacist. See how interactions work.
• Pregnancy. The risks above come from pregnant women. MedlinePlus says clinicians can check iron, zinc, anemia and, for children, lead. [5] Tell your midwife or doctor; see Pregnancy and breastfeeding.
• Babies and children. MedlinePlus says pica is most common in young children and that children who may have eaten lead-containing items should have lead levels checked. [5] See Children and teens.
• Breathing, skin, mouth, kidney and heart: the sources we read do not describe these for eaten clay.

How it is used and what to look for on a label

• Eaten clays are sold in markets as lumps, balls or powder, often without ingredient lists. We found no source that says a label shows lead or arsenic content.
• Cosmetic, pottery and garden clays are not made for eating; see Substances not meant to be swallowed.
• A craving for clay is a reason to ask for an iron check; MedlinePlus says treatment starts with missing nutrients and lead problems, then behavior support. [5]
• A 2025 scoping review found that education programs so far have not been effective in getting women to stop; it recommends community awareness about nutrition and iron and folic acid. [11]

Related pages

• Clay types at a glance
• Bentonite clay swallowing claims and lead
• Detox claims
• Iron
• Pregnancy and breastfeeding