Rice Water for Hair: How to Make It, How to Use It, and What It Actually Does

Is rice water good for your hair?

In one lab test it changed how damaged hair fibres behave, but the evidence that it does anything for hair on a real head is thinner than the hype. The best-known study of rice water on hair is a 2010 lab study by researchers at Kracie, a Japanese consumer-products company. It tested single strands of Asian hair that had been bleached and permed in the lab, with no people involved. On those strands, water from washing rice reduced friction and increased elasticity. The same plain rice water also left a powdery residue and made the hair less glossy. We found no controlled trial showing rice water grows hair. A 2023 letter from dermatologists put it this way: "Though preliminary studies of phenols, present in rice, are promising, there is no scientific evidence that rice water leads to hair growth."

Dermatologists also disagree about whether it helps or hurts. Cleveland Clinic dermatologist Alok Vij says the starch "acts like a conditioner." University of Minnesota dermatologist Ronda Farah says rice water may damage hair, especially coiled hair that breaks easily, and the university's write-up adds that starch can pull moisture from the hair. Neither view comes from a trial. Cleveland Clinic's own bottom line is that there isn't really any harm in trying. So treat rice water as something to try carefully and judge on your own hair, not as a proven treatment. Below: how to make it, how to use it, how long to leave it, and what's behind the claims.

What's actually in rice water?

Starch, protein, minerals and small amounts of things like inositol, in proportions that depend heavily on how the water was made.

  • The 2010 hair study's composition figure for its rice-wash material showed roughly 16% protein, 9% starch, 13% phytic acid, 4% inositol, 21% other inorganic material, and the rest fats and other carbohydrates. The paper doesn't say exactly what these are percentages of. That material came from a three-minute wash of polished Japanese rice.
  • In a 2017 food-science study of the water released when 12 kinds of rice were cooked, starch was 81–93% of what came out, and protein just 1–3%. Low-amylose (sticky) rice released much more material than high-amylose rice.

Those two measured different things, a quick wash and cooking water, which is the point: "rice water" isn't one liquid. So, does rice water have protein? Some, but how much depends on the method. The 2010 study tested a commercial hydrolyzed rice protein on damaged fibres, where it reduced friction and raised elasticity. We found no study that tested the protein actually in homemade rice water on hair.

About inositol, which you'll often see described as "repairing" hair: the only study we found that tested it on hair was the same 2010 lab study. There, inositol tested alone increased a measure of elasticity on lab-damaged fibres and gloss on undamaged hair. We found no study showing inositol from rice water repairs, strengthens or grows hair.

How to make rice water for hair

Here are the common methods. None has been tested against the others on hair, so the choice comes down to convenience and how cautious you want to be.

1. The short soak (the cautious option). Rinse uncooked rice once to remove dust, cover it with clean water, stir, let it sit, then strain the water off. Medical News Today's version uses half a cup of rice in 2–3 cups of water, soaked for 30 minutes. Cleveland Clinic's dermatologist Shilpi Khetarpal prefers a short soak, 30 minutes to two hours, over the other methods.

2. Boiling. Cook rice in about twice the usual amount of water and strain off the extra. Dr. Khetarpal says boiling may reduce some nutrients. Cooking water is also mostly starch (81–93% of what came out in the 2017 study), and the 2010 authors blamed water-insoluble material such as starch for the powdery residue.

3. Fermenting (we don't recommend it). Some guides ferment rice water by leaving it at room temperature for one to two days. Fermenting means letting microbes grow. Cleveland Clinic's write-up of Dr. Khetarpal's advice says a long soak "could add bacteria into your mix," and we found no study showing fermenting helps. More below.

Handle it as perishable. Use clean water and a clean container, and make a small fresh batch each time. Homemade rice water has no preservative, and uncooked rice often carries spores of Bacillus cereus, a bacterium best known for food poisoning from rice left out too long. A fridge isn't proven to make it safe. We found no study of how long homemade rice water stays clean, and the B. cereus review we cite found the bacterium can multiply at fridge temperatures in cooked-rice foods. Smell and looks aren't a reliable safety test either, and a sour smell is normal if you fermented it. Throw out leftovers. That's common sense, not a tested rule.

What kind of rice is best for rice water?

There's no evidence for one rice over another for hair. We found no study that compared white, brown, jasmine, basmati or sticky rice on hair. The 2017 cooking study only shows that sticky, low-amylose rice releases more starch into water. More starch isn't obviously better for hair: the 2010 authors blamed water-insoluble material such as starch for the residue. If you're asking because of arsenic: rinsing removed about 10% of the arsenic from basmati rice in one study, but that was about the rice you eat. We found no study of arsenic exposure from rice water on the scalp.

Is fermented rice water better?

We found no study showing fermented rice water is better for hair, or safer. Here's what's actually been measured, all in food-science labs:

  • When cooked rice was fermented with a deliberately added lactic acid bacteria culture at 35°C, its pH fell from 6.76 to 3.54 by day four.
  • When sterilised rice water was fermented with added cultures at 40°C, most cultures brought the pH from about 6 down to about 4–4.5 within six hours; others did much less.
  • When cooked rice was simply left in water at room temperature for 18 hours with no starter culture, the dominant bacteria included Bacillus and Pantoea, not mainly the "good" lactic acid bacteria people picture. That study didn't report a pH.

You'll read that fermenting brings rice water to the same pH as your hair. We couldn't find anyone who measured the pH of kitchen-fermented rice water, and Healthline's 4C article, which makes that claim, cites a study of fermented Java tea, not rice or hair. A survey of 123 shampoos describes hair's own pH as about 3.7 and the scalp's as about 5.5, and the authors say the best pH range for hair products still needs study. So a lower pH isn't proof of anything for your hair, and fermenting at room temperature means more time for whatever is in the jar to grow.

How to use rice water on your hair

As a rinse (the usual way): shampoo, rinse, then pour the rice water through your hair and massage it into the scalp. Leave it on for a while (see below), then rinse it out thoroughly. Cleveland Clinic's article says not rinsing it out thoroughly could also cause irritation.

As a spray: some people mist diluted rice water onto their hair or scalp between washes. This is where the starch question matters most, because nothing rinses it away. A homemade spray is also an unpreserved liquid in a bottle you touch and reuse, which is how products get contaminated, so make a very small batch and discard the rest. If your hair feels stiff, dull or crunchy afterwards, switch to rinsing.

Who should skip it: don't use it on an inflamed, sore or broken scalp; Dr. Khetarpal advises against it when the scalp is inflamed. A cosmetic safety review also notes isolated cases of allergy to raw rice. Patch-test a small spot first. That's common practice, not a tested protocol. Stop if your scalp itches, stings or turns red.

How long do you leave rice water in your hair?

There's no tested answer. Published advice ranges widely:

Source Leave-on time
Cleveland Clinic (Dr. Alok Vij) About 20 minutes, then rinse
Medical News Today Up to 20 minutes, then rinse thoroughly
Healthline (4C hair article) Anywhere from about 5 minutes to an hour, or overnight; the article also says low-porosity hair may dry out if it's left on too long

None of those times comes from a study. If you're trying it for the first time, start short, rinse well, and only leave it longer if your hair responds well.

How often should you use rice water? Can you use it every day?

There's no tested schedule, and neither Cleveland Clinic nor Medical News Today gives a number. Healthline's 4C article mentions weekly use for protective styles, and our rosemary and rice water post suggests starting once or twice a week. Treat that as a rule of thumb. In theory, more frequent use gives starch more chances to build up, but we found no test of that.

Watch for stiffness, a straw-like feel, dullness or more snapping. Stylists call that "protein overload." People noticed it long before anyone tried to measure it, and we found no research definition of the term yet, so treat it as a rule of thumb. Dry, brittle hair can also mean too little moisture or too much handling. We go deeper into this, and the other side effects, in rice water side effects: does it dry out your hair?

What about the "Chinese secret" for long hair?

Two stories sit behind rice water's reputation. One is the Red Yao women of Huangluo village in Guangxi, China, known for very long hair. The other is a legend, repeated by Cleveland Clinic, that court women in Japan's Heian period used rice water to grow floor-length hair. Here's what we could confirm about the Yao story.

  • The Guinness record is for combing, not length. On 22 April 2023, 256 Red Yao women set a Guinness World Record for the "longest hair combing chain," 456 metres long, at the village's annual long-hair festival. Guinness says the women traditionally cut their hair once in their lives, at 18. You'll often read that the village holds a "longest hair" record; we couldn't find that on Guinness's site.
  • The recipe isn't just rice water. Guinness's own article introduces it with "it is said," and describes fermented rice water boiled with grapefruit peel, tea-oil dregs and herbs.
  • We found no study of it. We found nothing linking the women's hair to rice water. Length depends on growth rate, how long each hair keeps growing, and whether it's cut or breaks. A tradition of almost never cutting hair could explain a lot on its own.

Medical News Today and Healthline repeat an average of six feet, and Medical News Today says the women don't go grey until their 80s, without a source. Other sites give different figures. We couldn't find any of them backed by a measurement. Guinness's own article says white hair is rare in the village but gives no data.

Is rice water good for 4C hair and locs?

We found no study of rice water on 4C hair, coily hair, locs or edges. A 2026 dermatology review of Afro-textured hair care doesn't mention rice water at all. The advice we found for coily hair is opinion: Healthline's 4C article quotes a cosmetic scientist and a hair-product founder. Dermatologists disagree about starch (above). If you try it:

  • 4C and low-porosity hair: use it as a rinse, keep the time short, and follow with your usual moisturising steps. If your hair feels stiff afterwards, dilute it more or use it less often.
  • Locs: stylists commonly warn that residue can collect inside a loc where it's hard to rinse out. That's practice, not tested. Focus on the scalp, rinse very thoroughly and dry fully.
  • Edges: tension from tight styles is a documented cause of thinning edges, and a rinse doesn't address it. Scarring alopecias, which are common in textured hair, can also thin edges, so if yours are thinning, see a dermatologist. See will my edges grow back.

What can you add to rice water?

We found no evidence that any add-in makes rice water work better for hair. Rosemary is a common one. We cover that combination, and how to handle it as perishable, in rosemary and rice water for hair. Essential oils don't dissolve in water and float in concentrated drops, and we haven't found a verified safe amount to add, so we'd leave them out. Anything food-like you add (fruit peel, aloe, herbs) gives bacteria more to feed on.

Store-bought rice water products

A product that says "rice water" on the front might contain rice water, rice extract, rice bran extract, hydrolyzed rice protein or a rice ferment. Those are different materials, and the lab results above came from rice-wash water, its components and an extract, not from any particular product. A review of cosmetic preservation says products containing water "require preservation against microbial contamination," so check the ingredient list for a preservative. And be wary of growth promises: in the US, the FDA gives claims that a product will "restore hair growth" as an example of claims that can make a product a drug rather than a cosmetic.

We sell a rosemary and rice water spray, Rosani: water-based, with rosemary extract and a rice ingredient, and no alcohol, sulfates or mineral oil. We found no study showing that Rosani, or rice water, grows hair. The practical reason to buy a bottle is that you don't have to make a fresh batch each time. Read the full ingredient list on any bottle, ours included.

Questions people ask

Can rice water grow hair? We found no controlled study showing it does. The only placebo-controlled trial of a rice ingredient we found used a 0.5% rice bran extract made with carbon dioxide, a different material from rice water.

How long should rice water sit before using it? For a short soak, 30 minutes to two hours is the range Dr. Khetarpal gives. Longer means fermenting, which isn't shown to help and gives bacteria more time.

Can I sleep with rice water in my hair? Some guides suggest it. We'd skip it: it gives the starch the longest time to dry onto your hair, and we found no data on leaving an unpreserved homemade liquid on your scalp overnight.

What can I do with leftover rice water? Throw out what you won't use right away. We found no study of how long it stays clean, so we won't give a number. Cleveland Clinic says soaking doesn't make the rice inedible; we wouldn't eat rice that has sat out for a day or more to ferment.

Sources

General information, not medical advice. If your hair loss is sudden, patchy or scarring, or your scalp is red, painful or sore, see a dermatologist.

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