Green Clay
Montmorillonite / Illite (mineral)
C Laboratory / animal evidenceA clay used in face masks to absorb oil and dirt. Drinking it is not recommended: it can contain heavy metals such as lead and arsenic.
Image: Herbadex Botanik Stüdyosu · Özel Üretim
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At a glance
Green clay is a mineral mix of montmorillonite and illite, coloured by iron oxides. Its surface binds oil and dirt, so it is used as a mask for oily and acne-prone skin; this absorbing effect has been shown in the lab. Drinking it as a "cleanse" is not recommended: clay products can contain lead and arsenic and block the absorption of medicines and nutrients.
Updated: October 15, 2026
ℹ Compiled from standard pharmacognosy references and clinical literature summaries where no formal EMA monograph exists.
What is it used for?
C Laboratory / animal evidence
Laboratory / animal evidence: Based only on laboratory (in vitro) or animal studies; not clinically proven in humans.
How do we rate evidence levels? →Used as a mask on oily skin because it absorbs oil and dirt; this effect has been shown in the lab. [1]
How is it used?
Topical
Mix 1 tablespoon of clay with water into a paste, apply thinly to the face and rinse with warm water before it fully dries (10 minutes).
Amount: 1–2 times a week
[1]Safety & interactions
⚠ External use only
- Do not drink it: it may contain heavy metals (lead, arsenic) and block medicine absorption; lead poisoning from eating clay has been reported.
- May dry dry or sensitive skin; do not let it dry completely.
- Do not apply to open wounds or inflamed skin.
- Do not inhale the powder.
Drug interactions
| Medicine / substance | Effect | Severity |
|---|---|---|
| All medicines, if swallowed | Clay binds medicines and blocks their absorption. [1] | Major |
Side effects
- Skin dryness and tightness
- If swallowed: constipation, heavy-metal poisoning risk
⚕ When to see a doctor
- If high fever, shortness of breath or purulent/bloody phlegm develops
- If symptoms do not improve within 1–2 weeks or worsen
- If severe abdominal pain, jaundice, rash or allergic reaction occurs
Did you know?
Eating clay (geophagy) is a tradition in some cultures, but today it is discouraged because of the lead poisoning risk. [1]
Frequently asked questions
Can green clay be drunk?
Not recommended. It may contain heavy metals and blocks medicine absorption.
Does green clay help acne?
It absorbs oil, so it is used as a mask for oily skin; it does not replace acne treatment.
How long should a clay mask stay on?
About 10 minutes; rinse before it fully dries.
Sources
- Trease and Evans Pharmacognosy (16th Edition)Elsevier Health Sciences · 2009
Cite This Page
Green Clay (Montmorillonite / Illite (mineral)). Herbadex — Doğal Şifa Rehberi (2026). https://herbadex.com/en/herb/green-clay/
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