Rhassoul clay, also spelled ghassoul, is a Moroccan clay that people mix with water into a paste for face masks and hair washes. We found no clinical trial of it on facial skin or hair, so this guide separates what is documented from what nobody has shown.
Comparing it with another clay? Our Rhassoul Clay vs Bentonite Clay guide sets out what we could and could not source.
A 2020 mineralogy study found a Moroccan ghassoul (rhassoul) sample consisted essentially of stevensite, a magnesium smectite clay, plus calcite, dolomite and quartz.
We found no clinical trial of rhassoul on facial skin, hair or dandruff; the only human report we located is a 2018 write-up of three ostomy skin case studies.
Mix a fresh mask each time, rinse before it cracks, and start with once a week. The AAD warns that a mask left on too long or used too often can cause irritation.
Patch-test first and rinse it off if it itches, burns or stings. A 2025 study found trace mercury in all 111 cosmetic clays tested, rhassoul included, none above regulatory limits.
What Is Rhassoul Clay?
Rhassoul clay is a clay from Morocco, also spelled ghassoul or rassoul, that people mix into a paste for face masks and hair washes.
In a 2020 mineralogy study in Heliyon, a ghassoul sample from Morocco's Missour province consisted essentially of stevensite (a magnesium smectite clay), calcite, dolomite and quartz. The authors list swelling behaviour among its properties, and our product page describes it as a medium-absorbency clay that swells when mixed with water.
Where Does Rhassoul Clay Come From?
It comes from Morocco. The 2020 study describes ghassoul as found only at Jbel Ghassoul, its own sample came from the Missour province, and our product page lists the origin as Moroccan, from the Atlas Mountains.
Our product page describes rhassoul as traditionally used as a hair and scalp cleanser, and the same paper notes it appears in modern skin-cleansing products and shampoos. We found no source for the mining-history, deposit-depth or trade-route claims often repeated online, so this guide leaves them out. If you buy rhassoul, look for a stated Moroccan origin on the label.
What Is Rhassoul Clay Made Of?
About half of the one sample analysed was silicon oxide. In the 2020 study it made up 53.62% of that sample, followed by sulfur oxide (9.87%), magnesium oxide (8.26%) and aluminium oxide (8.06%).
Composition varies by deposit and batch, so treat those figures as one measured sample, not a specification. We found no study showing that the silica or magnesium in a rhassoul mask is absorbed by skin or changes it, so we make no benefit claims for individual minerals.
How Do You Use Rhassoul Clay?
Mix the powder with water into a smooth paste, spread a thin layer, and rinse it off before it cracks. Our product page sells it as a mix-your-own mask, and the steps below follow it and the AAD's mask guidance.
- Patch-test first: Try a small amount on a small area of skin before using it on your face, as the AAD advises for any new facial mask, and watch for redness or irritation.
- Mix a fresh mask: Stir the powder into water, rose water or aloe gel until it forms a smooth, spreadable paste. Our product page has you mix a fresh mask each time, so do not keep leftover paste.
- Apply a thin layer: Spread it over clean skin, or work it through hair, keeping it away from your eyes, lips and any broken or inflamed skin.
- Rinse before it cracks: Our product page says to rinse before the mask cracks hard. The AAD notes that leaving a mask on longer than intended can cause irritation, so follow any timing on the label.
- Stop if it stings: Rinse with lukewarm water. If your skin itches, burns or stings at any point, wash the mask off straight away.
- Moisturize if needed: Follow with a light moisturizer if your skin feels tight.
Frequency: Our product page describes a weekly clarifying mask, so start with once a week. The AAD gives no number, but says a mask applied too often can leave your skin feeling worse.
Is Rhassoul Clay Good for Skin?
We can't say, because no trial has tested rhassoul on facial skin. Our product page sells it as the gentler, medium-absorbency clay for normal, dry or sensitive skin that still congests, but that is a positioning statement, not a study result.
The AAD names kaolin and bentonite, not rhassoul, among clay ingredients “to help absorb oil and soothe irritation” in masks for oily or acne-prone skin. The only human report we found on rhassoul is a 2018 write-up of three ostomy case studies, where it was used on damaged skin around a stoma; three cases cannot show that it works on facial skin.
Skip the mask if your skin is broken, sunburned or actively inflamed, and see a dermatologist for acne that is deep, painful or worsening.
Is Rhassoul Clay Good for Hair?
We can't say, because we found no study of rhassoul on hair, scalp oiliness or dandruff. Europe PMC searches on 2026-09-23 for rhassoul or ghassoul with hair or shampoo returned no hair trial, so we do not claim it conditions hair or helps dandruff.
It is traditionally used as a hair and scalp cleanser. People who try it mix the powder into a paste, work it through hair and scalp, and rinse thoroughly; stop if your scalp itches or burns. Our guides to Rhassoul Clay for Hair and Rhassoul Clay for Dandruff cover technique.
How Does Rhassoul Clay Compare to Other Clays?
No trial compares rhassoul with other clays, so the comparison below comes from our own product pages and the AAD, not from head-to-head data.
| Clay | What our product page or the AAD says |
|---|---|
| Rhassoul | Our product page: medium absorbency, sold for normal, dry or sensitive skin that still congests. |
| Multani Mitti | Our product page: a strong absorber, best suited to oily and combination skin. |
| Bentonite and kaolin | The AAD names both among mask clays that help absorb oil, for oily or acne-prone skin. |
For a detailed look at rhassoul against bentonite, see our Rhassoul Clay vs Bentonite Clay guide.
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Rhassoul Clay
Single-ingredient Moroccan rhassoul clay powder, sold by weight. A medium-absorbency clay you mix into a fresh mask each time.
Shop now → ✓ 30-day money-back guarantee · Free shipping over $75Frequently Asked Questions
Can rhassoul clay be used every day?
We don't recommend it, and we found no source that supports daily use. Our product page describes a weekly mask, and the AAD says masks used too often can leave skin feeling worse or cause irritation. Start with once a week and stop if your skin feels tight or irritated.
Does rhassoul clay expire?
We found no published shelf life for rhassoul powder. Keep the dry powder sealed and dry, and mix a fresh mask each time, as our product page directs, rather than storing leftover paste.
Is rhassoul clay safe for sensitive skin?
Nobody has tested it, so we can't promise it is. Our product page calls it one of the gentler common clays, but the AAD warns that an allergy to a mask ingredient can cause contact dermatitis, so patch-test first. A 2025 study also found trace mercury in all 111 cosmetic clays it tested, including six rhassoul samples (mean 38.7 µg/kg), with none above regulatory limits.
What is rhassoul clay best used for?
Our product page sells it as a weekly clarifying face mask and as a traditional hair and scalp cleanser. No trial has tested either use, so treat it as an optional mask, not a remedy for any skin or scalp condition.
Is rhassoul clay the same as bentonite clay?
No. A 2020 study identified ghassoul as stevensite, a magnesium smectite from Morocco, while the AAD names bentonite separately among clays for oily or acne-prone skin masks. We found no head-to-head trial; see our Rhassoul Clay vs Bentonite Clay comparison.
Our Rhassoul Clay is a single-ingredient Moroccan powder with nothing added, sold by weight.
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