Rosemary and Rice Water for Hair: Does It Work, and How Do You Mix It?

Does rosemary and rice water work for hair?

We found no study showing the mix grows hair, and none that tested the mix on anyone's hair. Rice water's best-known evidence is a lab study on hair fibres. Rosemary's is one 2015 trial of rosemary oil in pattern hair loss, not the water you'd mix at home. Be careful with posts that treat those two thin results as proof.

Some people use the mix because they like the ritual, which is a fine reason, as long as you know which part of the promise is measured and which part is hope. Below: what each ingredient has actually been tested for, whether you can mix them, who should skip it, how to make and store it more safely and when to throw it out, how it behaves on 4C hair and locs, and how to read the claims on a bottle. We sell a rosemary and rice water spray, so weigh what we say with that in mind. We'd rather you knew the evidence before you spent anything.

What does rice water actually do to hair?

A 2010 lab study is often cited for rice water: Inamasu and colleagues, in the Journal of the Society of Cosmetic Chemists of Japan. The four authors worked for Kracie Home Products, a Japanese consumer-products company. It was lab work on hair fibres, and there were no people in it. They took dark Chinese hair, damaged it in the lab by bleaching it three times (or bleaching and perming it), and treated it with the water left over from washing rice. On those damaged fibres, rice water lowered surface friction and made the hair more elastic when stretched.

Two details usually get left out. First, the plain rice water left a powdery residue on the hair and made it less glossy. The authors attributed the residue to water-insoluble material, such as starch, coming out of the water onto the hair, and judged that applying rice water directly was difficult. They went on to make an extract with 80% ethanol that had no starch in it, and their conclusion was about a cosmetic ingredient, not a kitchen rinse. Second, they tested parts of rice water one at a time. Hydrolyzed rice protein reduced friction and improved elasticity, and inositol improved elasticity and gloss. Inositol was tested on hair fibres only. We found no study showing it reaches the follicle or does anything for growth.

What the study didn't test: hair growth, a scalp, fermented rice water, coily or 4C hair, or using it for weeks. A 2023 letter from dermatologists in the Journal of Cosmetic Dermatology puts it flatly: "there is no scientific evidence that rice water leads to hair growth." A 2022 systematic review on "rice products for hair growth" is about rice bran extract, not the water you pour off a pot. The only placebo-controlled human trial of a rice ingredient we found used a 0.5% rice bran extract made with carbon dioxide, which is a different material from rice water.

Dermatologists also disagree about the starch. At Cleveland Clinic, dermatologist Alok Vij says it "acts like a conditioner." At the 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. If your hair has ever come out of a rice rinse stiff and straw-like, the full breakdown is in does rice water dry out your hair.

What does rosemary do for hair?

The rosemary trial everyone cites used rosemary oil. In 2015, Panahi and colleagues randomly assigned 100 people with pattern hair loss to rosemary oil or 2% minoxidil for six months. Later reviews describe the participants as men, and we found nothing on women. Neither group changed at three months. Both had more hair at six months than at the start, with no difference between them, and scalp itching went up in both groups. There was no placebo group, so the trial can't tell you whether rosemary beat doing nothing. We go through what it does and doesn't show in rosemary oil vs minoxidil and in how long rosemary oil takes to work.

For rosemary water, an infusion or a water-based extract, we couldn't find a single controlled human trial. What exists is lab and animal work. In one mouse study, a topical rosemary leaf extract was linked to more regrowth in mice given testosterone. The abstract doesn't say what solvent the extract was made with, and mice are not people.

Rosemary water and rosemary oil also aren't interchangeable. A 2023 lab study of ten commercial rosemary extracts, by researchers from Procter & Gamble, Kew and the University of York, found rosmarinic acid dominated the extracts rich in polar (water-friendly) compounds and carnosic acid dominated those rich in non-polar ones. The study was about protecting hair from UV damage, not growth. Different preparations contain different compounds, and we don't know that a home infusion matches any of them. If you're choosing between the two, rosemary water vs rosemary oil compares them on what matters day to day.

Can you mix rosemary water and rice water?

Probably, but we found no study of the combination, so this is practical judgment, not tested advice. Both halves are water with plant material in it, which is a good place for bacteria and mould to grow, so treat the mix as perishable. Uncooked rice often carries spores of Bacillus cereus, a bacterium best known for food poisoning from cooked rice. We found no study of scalp infections from homemade rice water.

Don't add rosemary essential oil to the mix. It doesn't dissolve in water, so it floats in concentrated drops that can land on your scalp or in your eyes. We haven't verified a safe dilution, so we won't give one. If you use rosemary oil at all, patch-test first and ask a dermatologist.

Who should skip it?

  • Anyone with an irritated scalp. If your scalp is red, sore, flaking heavily or has open spots, leave the whole mix alone, along with any leave-in scalp product (ours included), and see a dermatologist. Cleveland Clinic dermatologist Shilpi Khetarpal advises against rice water when the scalp is inflamed.
  • Anyone who reacts to rosemary. It's uncommon, but rosemary leaf extract has caused allergic contact dermatitis. One case report describes a woman whose facial rash was traced to rosemary extract in a cleanser. Patch-testing a small spot behind your ear or on your inner arm before using anything new on your whole scalp is common practice, not a tested protocol. Stop at any itching or redness.
  • Young children. We found no safety data on this mix for young children. Ask a pediatrician or dermatologist before using it on a child. Our age-by-age guide to rosemary for kids has more.

How do you make rosemary and rice water at home?

Make the two halves separately, then combine them, so each gets the method that suits it.

The rice half. Rinse uncooked rice once to wash off dust, soak it in clean water, stirring now and then, then strain the water off. Of the three home methods (a short soak, boiling, or fermenting for a day or more), Dr. Khetarpal prefers the short soak, 30 minutes to two hours, and Cleveland Clinic's write-up of her advice says "the long soak could add bacteria into your mix." For comparison, the rice water in the lab study was rice washed for three minutes and diluted, not a soak or a boil, so no home method matches what was tested.

The rosemary half. Brew it the way our rosemary water shelf-life guide lays out: distilled water boiled with the lid on, rosemary added off the heat, steeped covered, then strained twice so no leaf bits float in the bottle.

Combine. Once both are cool, mix them about half and half in a bottle you've washed and let dry completely. There's no tested "best ratio"; half and half just leaves less starch than straight rice water. Write the date on the bottle.

Fermenting means deliberately letting microbes grow, so it doesn't make the mix safer, and we found no study showing it makes it work better. Fermenting at room temperature also gives microbes more time to grow, and the long soak is the method Cleveland Clinic's write-up of Dr. Khetarpal's advice warns against.

How long does homemade rosemary rice water last?

We found no study of how long any homemade rice water or rosemary water stays clean, so we won't give you a number. The ones you'll see online disagree widely. If you make it, make a small batch and keep it cold, but we found no evidence that a fridge makes it safe. Treat it as perishable.

Throw it out if it looks or smells different from when you made it: cloudier than at the start, a film on top, slimy or stringy bits, fuzzy spots, or a sour or musty smell. Rice water starts out cloudy, so judge by change. This is common sense, not a tested rule. For rosemary water on its own, there's a fuller checklist in how long does rosemary water last.

This is the real reason water-based products you buy contain preservatives. A review of cosmetic preservation in the journal Molecules says products containing water "require preservation against microbial contamination." The FDA lists contaminated water, weak preservation and "dipping fingers into the product" among the ways cosmetics get contaminated, and notes that microorganisms "may grow faster in warm or damp storage conditions." A jar in your kitchen has none of that protection.

How do you use it: rinse it out or leave it in, and how often?

As a rinse: after shampooing, pour or spray it through your hair, leave it a few minutes, and rinse it out well. Cleveland Clinic's article says not rinsing it out thoroughly could also cause irritation. If you're trying it on your lengths, a rinse is a more cautious way to start, especially if your hair has reacted to protein before.

As a leave-in scalp spray: spray the scalp, not the lengths, and rub it in with your fingertips. A leave-in is where the starch question matters most. In the lab study, plain rice water left a powdery residue, and starch may be why your hair feels stiff or crunchy. If you want a leave-in, a thinner mix (more rosemary water, less rice water) leaves less starch than straight rice water.

How often: there's no tested schedule. Start once or twice a week with a fresh batch, and stop if your hair gets stiff or dull or your scalp itches or stings. Stylists call that stiffness a protein reaction. We couldn't find a study that defines or measures "protein overload," so treat it as a rule of thumb. Dry, brittle hair can also mean too little moisture or too much handling. If your hair is breaking a lot or shedding, see a dermatologist.

Is rosemary and rice water good for 4C hair, locs and edges?

We found no study that tested rice water on 4C hair, locs or edges, and nothing showing the rosemary trial included textured hair. The rice water study used lab-damaged Chinese hair. So everything below is cautious practice based on dermatologist opinion and general hair-care experience, not tested results.

  • 4C and low-porosity hair: start with a rinse, not a leave-in, and go light on the rice water. Coily hair has more twists, which make it more prone to breaking when it's handled, and people on natural-hair forums ask about breakage and dullness after rice water.
  • Locs: stylists commonly warn that residue can collect inside a loc where it's hard to rinse out, and that locs which stay damp inside can start to smell. Spray the scalp and roots rather than soaking the length, and let your locs dry fully. More on what people use between wash days in rosemary oil for locs.
  • Edges: be gentle with the hairline and keep the mix out of your eyes. If your edges are thinning, a common, well-documented cause is tension from tight styles, and no spray fixes that. See will my edges grow back.

Homemade or bottled: which makes more sense?

A homemade mix costs almost nothing, and you know exactly what went into it. A bottled spray costs money, but you don't have to re-brew it. Here's the comparison.

Homemade mix Bottled spray
How long it keeps Unknown; treat as perishable Set by the maker; check the label
Preservative None Should have one; check the ingredient list
Starch residue Depends on your batch Depends on the formula; check the label
Cost Pennies The price of the bottle
Effort Re-brew often None

The case for buying isn't that a bottle is better for your hair; no one has compared them. It's that a company selling a bottled product is responsible for making sure it's free from harmful microorganisms, and you don't have to re-brew. Ours is Rosani, a water-based spray with rosemary extract and a rice ingredient, and no alcohol, sulfates or mineral oil. A 200 ml bottle lasts about six to eight weeks of daily use. Read the full ingredient list on any bottle, ours included, before you buy.

How to read the claims on a rosemary and rice water bottle

"Rice water" on the front can mean different things on the back. The ingredient list might say rice water, rice extract, rice bran extract, hydrolyzed rice protein or a rice ferment. These are different materials. Making fermented rice water at home and a manufactured rice ingredient are different things too. The lab results above came from rice-rinse components and an extract, not from any particular product, so "rice water" on a front label tells you very little.

Look for a preservative. Any product that contains water and is meant to last weeks needs one. Common examples on hair-product labels include phenoxyethanol, sodium benzoate and potassium sorbate. A water-based spray that calls itself preservative-free and still claims a long shelf life should make you ask questions.

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 may cause a product to be considered a drug, even if it's marketed as a cosmetic. That applies to claims online and in ads, not just on the label. A cosmetic can describe how hair looks and feels, such as softness or shine. We found no study of rosemary water or rice water that supports a promise of regrowth.

When isn't it a hair-care problem?

If your hair is coming out in patches, your part or crown is widening, your scalp itches, burns or feels tender, or you're shedding far more than usual for more than a few weeks, see a dermatologist, ideally one who treats textured hair. Traction alopecia, from styles that pull, and central centrifugal cicatricial alopecia (CCCA), a scarring type, are both common in people with textured hair. Early recognition offers a chance to prevent permanent traction alopecia. A 2020 systematic review, with a literature search through March 2018, found no clinical trials of natural ingredients, including rosemary oil, for CCCA. We explain how to tell the two apart in traction alopecia or CCCA, and what to make of extra shedding after starting rosemary in shedding more since starting rosemary water.

Questions people ask

Can I leave rosemary and rice water in overnight? We'd skip it. We found no safety data on leaving unpreserved homemade rice or rosemary water on the scalp for hours, and starch can leave residue. If you try it anyway, use a fresh, thin batch and rinse in the morning.

Which is better, rice water or rosemary water? We can't tell you which is better for your hair. Rice water has lab data on fibre friction and elasticity, but on bleached hair in a lab, and the plain water left a residue. Rosemary has a trial, but of the oil.

Does fermenting rice water make it work better? We found no study showing that. Fermenting means days at room temperature, and the FDA notes microorganisms may grow faster in warm conditions.

Is rice water safe, given the arsenic in rice? We couldn't find any study that measured arsenic or other heavy metals from putting homemade rice water on the scalp. A 2006 Cosmetic Ingredient Review report found heavy-metal levels in the rice-derived cosmetic ingredients it assessed were not a safety concern at the levels reported, but that was about manufactured ingredients, not kitchen rice water.

Can I use it every day? There's no tested schedule. Start once or twice a week with a fresh batch, and stop if your hair gets stiff or dull or your scalp itches or stings.

Will it grow my edges back? There's no evidence that it will. If your edges are thinning, start with the styles pulling on them, and see will my edges grow back.

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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