Is Mustard Oil Good for Hair?

Last updated: 26 August 2026

Mustard oil is one of the oldest hair oils in India. The truth about mustard oil is that while it does perform some of what it claims to do, it does not perform other aspects of its claims. There is a decent amount of research done on how hair oils work on the hair too, including research specifically investigating the antibacterial effects of mustard oil. However, there is no data from human trials proving the ability of mustard oil to promote hair growth and any person selling it on this basis is ahead of the science.

Allyl isothiocyanate is the active compound that gives mustard oil its effectiveness on the scalp, while at the same time making it unsuitable for some people. This is the substance that makes the oil burning and provides it with its action that makes the oil anti-microbial. It is also the cause of contact dermatitis experienced by some people after contact with the oil.

What actually reaches the scalp when you oil with mustard?

The percentage of monounsaturated fatty acids existing in mustard oil can fluctuate between 60 and 72%. At the same time, its polyunsaturated fats portion is smaller than its monounsaturated one and its saturated one is small as well. Also, mustard oil contains allyl isothiocyanate, which is responsible for its pungent smell, along with little amount of fat-soluble vitamins and phytosterols.

There are two factors to consider when discussing hair. The first is the lipid component that covers hair and minimizes friction. This is the method for achieving a lot of the results of oiling. Decreased breakage in combing, decreased protein loss during washing, and improved manageability of the hair instead of enhanced growth of the hair are the events of this process. The second factor is the isothiocyanate component that influences the scalp surface and causes the stinging sensation.

What can an oil actually reach?

Lower than what is expected by most individuals. The hair that appears is made up of dead keratin, therefore, whatever is put on it cannot feed it; rather, it gets conditioned as a result of a mechanical function, not a biological one.

The hair's living portion originates from the follicle, located underneath the skin, and receives nutrition from the blood. This makes it possible to understand the essence of hair oils because it shows that caring for the hair with oils usually enhances its external appearance but does not really create a positive impact on hair growth.

Is hair oiling itself supported by evidence?

Better than most people assume, though not always for the reasons given. A 2022 review in the International Journal of Trichology sets out the indigenous knowledge base behind Indian hair oils and the mechanisms that have actually been studied. Among its findings, mustard oil inhibits the penetration of Trichophyton mentagrophytes into hair. That is a fungal organism associated with scalp infection, and it is one of the more concrete findings in this literature.

What does the research on mustard oil and hair actually show?

Less than the internet suggests, and more than nothing. The useful evidence clusters around three areas.

The first is antimicrobial and antifungal behaviour on the scalp, where mustard oil has been shown to interfere with fungal penetration of the hair shaft.

The next category is relative formulation work: a 2013 study compared a herbal hair oil formulation against plain mustard oil for their benefits, thus using mustard oil merely as a comparison rather than the principal subject. The last is the general argument in favour of oiling, with equal regard given to mustard oil as well as to coconut and sesame oils.

There is no study that everybody awaits. There are no valid human trials conducted to prove that mustard seed oil restores hair in androgenetic alopecia, makes an improvement in baldness, and increases hair count. This statement is widely believed and argued based on the oil's nutritional content, but it does in fact not prove anything.

Does mustard oil help hair grow?

Not in the sense most people mean. The distinction matters. It changes what you should expect.

There is no scientific evidence proving that mustard oil promotes new hair growth or prevents hair loss. The arguments supporting the claims are related to the massage of scalp, which is said to be able to enhance blood circulation, and the contents of mustard oil, which is expected to have all nutrients necessary for the hair.

The first is about massage rather than about mustard oil specifically, and applies equally to any oil or to no oil. The second confuses what is in a bottle with what a follicle can use; hair growth is driven largely by genetics, hormones and systemic nutrition, not by topically applied fatty acids.

The potential effect of oiling is to minimize breakage, consequently leading to what appears to be hair growth, because hair that is not breaking in the middle grows longer. While it is a genuine benefit, it is easy to confuse this with growing more hair, thereby leading to overstatements concerning a legitimate practice.

Whether your hair loss occurs gradually, involves a defined pattern, or happens quickly, an oil is not the solution. This subject requires discussion with a specialist in skin disorders, and this article is merely informative.

Does mustard oil help with dandruff and scalp itch?

Despite this being the strongest claim in terms of its mechanism, it is still weaker than the assertive papers imply.

Dandruff is mostly due to Malassezia which indicates the presence of yeast on normal scalps and causes problems for some individuals. Mustard oil is known for its effectiveness against microorganisms and fungi, as both have been documented in trichology literature to prevent fungal invasion of the hair shaft.

A certain 2013 formulation research has used simple mustard oil as the reference point in the testing of herbal hair oils against dandruff-causing activities and hair fall. It has already been considered an active reference and not just an inactive carrier.

What is not clearly shown is that the use of mustard oil helps in dandruff removal as effectively as medicated shampoos do. There is a serious complication in this situation. Malassezia feeds on fats and hence applying thick oils on the already afflicted scalp and keeping them on for hours may worsen the situation. Those suffering from the chronic problem of flaking have learned that less is more in this respect.

The practical position is that mustard oil is worth trying for occasional dryness and mild itch, and is not a substitute for treatment where flaking is persistent, inflamed or spreading. Ketoconazole and zinc pyrithione shampoos exist because the yeast problem needs something the oil does not do.

Does mustard oil turn hair grey, or prevent greying?

Neither, and both claims circulate widely enough to be worth answering.

Greying is driven by melanocyte activity in the follicle declining with age, and that decline is largely genetic. No topical oil has been shown to reverse it or to accelerate it. Claims that mustard oil prevents premature greying usually point to its vitamin and mineral content. That is the same reasoning error as the hair growth claim: what is in the bottle is not evidence of what the follicle does with it.

In the opposite claim, stating that mustard oil is harmful for hair, there lies a slight truthfulness in the fact that mustard oil is rich in colour. However mustard oil does not dye hair. The darker shade noticed is just the oil stuck onto it and being washed away later.

Which mustard oil suits hair oiling?

The determining factor is pungency, which contrasts with popular belief: the sharper the oil, the bigger likelihood it has to cause irritation on a sensitive scalp.

Per 100 g	Black	Yellow	High oleic	Source
Saturated fat	8.2 g	4.9 g	7.8 g	Product labels
MUFA	60.1 g	72.6 g	60.2 g	Product labels
PUFA	31.7 g	22.4 g	29.1 g	Product labels
Character	most pungent, AITC-rich	mildest of the three	bred for fat profile	Product pages

A black mustard oil carries the most allyl isothiocyanate and is the sharpest on the scalp. A yellow oil is the mildest of the three and the sensible starting point for anyone who has previously found mustard oil uncomfortable, or who is oiling a child's hair. The figures above come from product labels, and where a value is not published for a given oil it has been left out rather than estimated.

According to SatRas on all three of its oils, hair oiling is noted as a traditional application. That describes how the oil has been used, not what it delivers. Its yellow mustard oil is the mildest in the range and the black the most pungent. The differences are set out in black or yellow mustard oil: which should you buy.

Does freshness matter more for scalp use than for cooking?

Yes. One point of quality is relevant more in topical applications than in cooking. Unrefined oil that has been oxidized will smell flat or waxy and should not be applied on the scalp as there is no point in using a rancid oil. You should basically purchase the size that you can consume and store it away from sunlight.

How is mustard oil used on hair?

The traditional method is simple and has not changed much. Warm a small quantity, work it into the scalp with the fingertips rather than the nails, then through the lengths, and leave it for anywhere between thirty minutes and overnight before washing out.

How much oil, and how warm?

Here is where many people mess it up. Less really is more in this instance. You only need approximately two to three teaspoons for shoulder-length hair. Using more hair oil simply makes it harder to wash off and causes one to use stronger shampoos which completely defeats the purpose of using hair oil. In many Indian homes, oil is warmed up slightly beforehand so that it spreads more easily, which is as far as warming is concerned. Going beyond body temperature does not help and is just dangerous.

There is another step that must be noted because the majority of people are greatly confused about it and yet it is applied frequently. Some people heat mustard oil until it smokes and then let it cool before use. This is an approach taken from cooking practices where the idea is to reduce the pungency of the mustard oil. However, this step diminishes the oil's quality and if pungency is the major issue, it is better to use a milder oil at the beginning than to go through the process of bringing the pungent oil to that state.

How do you get it out again?

The washing out process is where complaints occur and raw mustard oil gives off a strong smell that doesn't go away quickly. This is the one downside of the entire procedure.

Applying to dry hair rather than damp, using a small quantity, and shampooing once thoroughly rather than twice aggressively is generally enough. Some people finish with a dilute lemon or vinegar rinse to cut the residual smell, which is a comfort measure rather than a hair treatment.

Frequency follows scalp type, not a rule. Once or twice a week suits most people. An oily scalp does not need oiling more often to compensate, and leaving heavy oil on an already oily scalp for long periods can make dandruff worse rather than better.

Who should not use mustard oil on hair or scalp?

This is the part most articles skip, and it is the part with the strongest evidence behind it.

The dermatology literature names allyl isothiocyanate as the principal allergen in mustard oil, and the compound behind its contact dermatitis cases. A report series in the journal Indian Journal of Dermatology, Venereology and Leprology revealed pityriasis rosea-type rash following the application of mustard oil. If you have eczema, psoriasis, a sensitive scalp, or know about your mustard allergy, do not experiment with the oil.

Infants are the clearer case. A study of newborns routinely massaged with mustard oil in rural Nepal found indicators of skin irritation and barrier damage during the first two weeks of life. Infant skin is thinner and more permeable than adult skin, and the traditional status of the practice is not a safety argument. Mustard oil should not be treated as universally suitable for babies, whatever the custom in a given family.

For everyone else, a patch test settles it. Put a little on the inner forearm, leave it a day, and see what happens before putting it on your head. Erucic acid, the other compound mustard oil is argued about, is a dietary question rather than a topical one. Codex Alimentarius records mustardseed oil across a wide compositional band, and we have covered that debate in is mustard oil safe: the erucic acid question.

Frequently asked questions

Does mustard oil stop hair fall?

There is no reliable human evidence that mustard oil stops hair fall. Oiling can reduce mechanical breakage, which means less hair snapping during combing and washing, and that is often mistaken for reduced shedding. Shedding driven by hormones, illness or nutritional deficiency will not respond to a topical oil.

Can you leave mustard oil in hair overnight?

Yes, and it is the traditional practice, but it suits some scalps better than others. An overnight application gives the oil longer to coat the shaft. On an oily or dandruff-prone scalp, leaving heavy oil on for eight hours can aggravate the problem, so thirty to sixty minutes is often the better choice.

How often should mustard oil be used on hair?

Once or twice a week works for most people. Frequency should follow scalp type rather than a fixed schedule: a dry scalp tolerates more, an oily one less. Using it daily offers no additional benefit and generally means washing more aggressively, which works against the reason for oiling.

Is mustard oil good or bad for hair?

For most people it is a reasonable traditional hair oil with a genuine mechanical benefit and some antimicrobial support in the literature. It is bad for a minority whose skin reacts to allyl isothiocyanate, and it is not a treatment for hair loss. Patch test first, and judge it on breakage rather than on growth.

Is mustard oil or coconut oil better for hair?

Neither is better in general. Coconut oil has more published work on reducing protein loss from the hair shaft and is lighter to wash out. Mustard oil is more pungent, has some antifungal evidence behind it, and suits people who want the warming quality. Scalp sensitivity usually decides it rather than composition.

Can mustard oil be used on hair in summer?

Yes, though many people find it heavy and warming in Indian summers and prefer a lighter oil. If you use it in hot weather, a shorter application before washing is more comfortable than an overnight one. There is no seasonal safety issue, only a comfort one.