Rhassoul clay is a Moroccan clay that some people mix into a paste and use as a “clay wash” in place of, or between, shampoos. We found no study of rhassoul on hair, so this guide gives the technique people use and is plain about what nobody has shown.
Want the full picture on the clay itself? Our What Is Rhassoul Clay? guide covers what it is made of and where it comes from.
We found no study of rhassoul on hair. The nearest evidence is a 2026 lab study of two clays, one bentonite, in solid shampoo and conditioner, which improved hair-fibre strength and gloss.
That study tested formulated products on hair fibres, not a clay-paste wash and not rhassoul, so it cannot tell you what a rhassoul wash does to your hair or scalp.
If you try a clay wash, apply the paste to wet hair, rinse thoroughly, follow with conditioner, and start rarely. Stop if your hair feels dry or tangled or your scalp itches or burns.
We found no source for an ideal clay-to-water ratio, sit time or wash interval, so treat specific numbers you see online as unverified and adjust to how your hair responds.
Does Rhassoul Clay Work for Hair?
We can't say, because we found no study of rhassoul on hair. Europe PMC searches on 2026-09-23 for rhassoul or ghassoul with hair or shampoo returned no hair trial.
Rhassoul (ghassoul) is a Moroccan clay that a 2020 mineralogy study found to be essentially stevensite, a magnesium smectite, with calcite, dolomite and quartz. Our product page describes it as traditionally used as a hair and scalp cleanser.
The nearest evidence is a 2026 lab study in the International Journal of Cosmetic Science. It added two commercial clays, one identified as bentonite and one a muscovite-type clay, to solid shampoo and conditioner at 0.5% to 3% and found stronger hair fibres, improved combing force and more gloss. It tested formulated products on hair fibres, not a clay-paste wash, and not rhassoul.
So we make no claim that a rhassoul wash cleanses without stripping, conditions the cuticle, reduces frizz or supports hair strength: no source shows those for a rhassoul wash.
Which Hair Types Do People Use It On?
We found no study of which hair types respond to a clay wash, so we can't name a type that benefits most. Our product page lists hair and scalp use but does not say which hair types suit it.
- Any hair type: test a small section first, and stop if it feels dry, tangled or rough afterward.
- Colour-treated hair: we found no source on how clay washing affects hair colour, so test a small hidden section first and ask your stylist.
- Sensitive scalp: try a small amount on a small patch of skin first, and stop if your scalp itches, burns or stings.
How Do You Make a Rhassoul Clay Wash?
Stir the powder into water until it forms a smooth paste that spreads easily through wet hair. Our product page says to mix it into a paste, work it through and rinse it out, and to use a non-metal bowl.
We found no source for a clay-to-water ratio, so start with a small batch and adjust: too thick and it will not spread, too thin and it will run. Our product page has you mix a fresh batch each time rather than keeping leftover paste.
How Do You Apply It Step by Step?
Apply the paste to wet hair in sections, massage the scalp gently, rinse thoroughly and follow with conditioner. These steps are common technique, not trial-tested.
- Patch-test first: Try a small amount on a small patch of skin before using it on your scalp, and watch for redness or irritation.
- Wet your hair: Wet it thoroughly, then divide it into sections and clip them out of the way.
- Apply the paste: Spread it through each section from scalp to ends, keeping it away from your eyes and any broken or irritated skin.
- Massage gently: Use your fingertips, not your nails, on the scalp.
- Rinse before it dries hard: Our product page says to rinse its face mask before it cracks hard, and the same caution is sensible here, and rinse until no gritty residue is left.
- Condition afterward: Follow with a conditioner, especially if your hair feels dry or tangled.
How Often Should You Use It?
We found no source for an ideal interval, so start rarely and let your hair tell you. Try one clay wash, check how your hair and scalp feel over the next few days, and only then repeat.
If your hair feels dry, tangled or straw-like, or your scalp feels tight or irritated, wait longer between washes or stop.
Should You Use Clay Wash Instead of Shampoo?
We can't recommend replacing shampoo, because no study has tested a rhassoul wash as a shampoo substitute. If you want to try one, treat it as an occasional extra and keep your usual shampoo.
If your concern is flaking or an itchy scalp, see our Rhassoul Clay for Dandruff guide for what the NHS and the AAD say before reaching for a clay wash.
Featured in this guide
Rhassoul Clay
Single-ingredient Moroccan rhassoul clay powder, sold by weight. Traditionally used as a hair and scalp cleanser.
Shop now → ✓ 30-day money-back guarantee · Free shipping over $75Frequently Asked Questions
Can rhassoul clay replace shampoo entirely?
We can't say: no study has tested a rhassoul wash as a shampoo replacement, so we recommend using it as an occasional extra. If your scalp itches, burns or flakes, stop and see a professional.
Will rhassoul clay strip my hair color?
We found no source on how clay washing affects hair colour, so we can't promise it won't. If your hair is colour-treated, test a small hidden section first and ask your stylist.
How is rhassoul clay different from bentonite clay for hair?
We found no study comparing them for hair. The 2026 lab study tested a bentonite and a muscovite-type clay in shampoo formulations, not rhassoul. Our Rhassoul Clay vs Bentonite Clay guide sets out what we could source.
Do I need to condition after a rhassoul clay wash?
We found no source either way. Following with a conditioner is a cautious step if your hair feels dry or tangled after any clay wash, but that is common advice, not a trial result.
Is rhassoul clay the same as multani mitti?
No. Our product pages describe rhassoul as a medium absorber and multani mitti as a strong absorber best suited to oily and combination skin, and they are different clays. Our Rhassoul Clay vs Multani Mitti guide compares them.
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