Botox for hair loss and oily scalp: early studies and open questions

Botulinum toxin, best known by the brand name Botox, is one of the most familiar injections in aesthetic medicine. In recent years some clinics in Malaysia and elsewhere have started offering "scalp botox" for two quite different problems: thinning hair and an oily, greasy scalp. Advertisements may describe it as a way to relax a tight scalp, block DHT or keep hair fresh for longer between washes.

This guide looks at what the research actually shows for each use, why the oily-scalp evidence and the hair-loss evidence should be judged separately, the side effects that have been reported, and the questions worth asking before you agree to treatment. It is general information, not personal medical advice. For a wider view of non-surgical options, see non-surgical hair loss treatment in Malaysia.

Short answer

• For pattern hair loss, the evidence is early and mixed. A 2025 meta-analysis of eight studies found a higher hair count with botulinum toxin than with controls ¹, but a 2025 randomised trial in 15 men found no improvement in hair density at six months ².
• Reviews urge caution. A 2025 review of 40 articles said most androgenetic alopecia studies reported mild or non-significant hair growth and that outcome measures varied too much to justify botulinum toxin over established treatments ³.
• For oily scalp, there is one encouraging controlled trial. A randomised, placebo-controlled study in 49 people found one session reduced scalp sebum for about three months, with no difference by four to six months ⁴.
• It is not a clear treatment for dandruff. A small study found no significant improvement in seborrhoeic dermatitis symptoms after injection ⁵.
• It is a prescription medicine. Botulinum toxin should only be injected by a trained, registered doctor, and it does not replace minoxidil or finasteride ⁶.

What botulinum toxin does

Botulinum toxin is a purified protein made by the bacterium *Clostridium botulinum*. In tiny, controlled doses it temporarily blocks signals from nerves to muscles and to some glands. That is why it relaxes frown lines, and why it reduces sweating when injected into the skin of the underarms or scalp. The effect wears off over months as nerve endings recover, so treatment has to be repeated if the effect is wanted again.

In the scalp, two effects are of interest:

• Muscle relaxation. Muscles around the scalp, such as those in the forehead, temples and back of the head, can be relaxed by injection.
• Gland effects. Botulinum toxin can reduce sweat and, according to some studies, sebum (oil) production in the treated skin.

Why it has been tried for hair loss

The idea behind using botulinum toxin for pattern hair loss is mostly theoretical. One proposed explanation is that tension in scalp muscles reduces blood flow and oxygen in the skin over the crown, and that relaxing those muscles may improve conditions for follicles. Another suggests effects on local DHT activity, the hormone involved in pattern hair loss; see DHT and hair loss. These mechanisms have not been proven in people, and reviews describe them as hypotheses ^{3 7}.

What the hair-loss evidence shows

The positive meta-analysis

A 2025 meta-analysis in Dermatologic Surgery searched six databases and included eight studies on botulinum toxin for androgenetic alopecia ¹. Pooled data showed a statistically significant increase in hair count with botulinum toxin compared with control groups. The authors called it promising, with good safety. However, they also noted that most studies had small sample sizes, which limits how much weight the pooled result can carry.

The negative randomised trial

In 2025, a randomised trial from Mexico tested a single session of 100 units of botulinum toxin as the only treatment in 15 men with moderate pattern hair loss ². One group received injections under the skin and into muscle; the other received injections under the skin only. After six months, neither group showed a significant change in hair density or in the ratio of fine to thicker hairs. Hair thickness in the front of the scalp actually decreased in both groups, and terminal hair count decreased in one group. The authors concluded they found no supportive results for botulinum toxin in pattern hair loss.

This trial was small and used only one session, so it does not settle the question. But it is a useful reminder that positive results from small, uncontrolled studies may not hold up in a randomised design.

What the reviews say

• A 2025 review by hair specialists identified 40 articles covering 689 patients treated with botulinum toxin for hair and scalp conditions ³. For androgenetic alopecia, most studies reported mild or non-significant hair growth. The authors said variability in outcome measures made it hard to draw definitive conclusions or to justify botulinum toxin over established treatments.
• A 2023 systematic review found 24 original articles covering 309 patients with scalp conditions ⁸. It said the quality of evidence was highly variable and, for many conditions, limited to small observational studies.
• A 2020 systematic review of 11 articles and 106 participants described botulinum toxin as a "double-edged sword" in alopecia, with low levels of evidence and reports of adverse effects, and called for larger placebo-controlled trials ⁷.

Taken together, botulinum toxin for hair loss is still experimental. It is not part of standard first-line treatment for pattern hair loss. See treatments with weak evidence for how to judge similar claims.

What the oily-scalp evidence shows

The oily-scalp evidence is a separate question and, so far, somewhat stronger. A multicentre, randomised, double-blind, placebo-controlled study in China compared one session of intradermal botulinum toxin (50 to 65 units) with saline injections in people complaining of oily scalp or hair ⁴. Twenty-five people in the botulinum toxin group and 24 in the saline group completed follow-up.

Compared with saline, botulinum toxin significantly reduced scalp sebum in the treated area when measured one to three days after shampooing, at the one-month and three-month visits. By four and six months there was no significant difference between the groups. Satisfaction was higher in the botulinum toxin group, and no serious adverse events occurred.

This suggests a temporary effect that may last around three months. It is one trial in one population, and repeat sessions would be needed to maintain any benefit. For most people with an oily scalp, simpler steps such as adjusting washing frequency and using a suitable shampoo come first; see oily scalp and hair loss.

Dandruff and seborrhoeic dermatitis

Seborrhoeic dermatitis is linked to oil and to a yeast called *Malassezia*, so it might seem logical that reducing oil would help. However, a 2023 single-arm study in 20 people found no significant improvement in seborrhoeic dermatitis symptoms one month after botulinum toxin injection ⁵. Antifungal shampoos, such as those with ketoconazole, remain the usual first step.

Scalp pain

Some people with hair loss also have scalp pain or burning, called trichodynia. A 2026 retrospective study of 21 people with trichodynia who had stopped or refused other treatment reported that most felt better after intradermal botulinum toxin, with only minor side effects ⁹. Because it was retrospective and had no control group, the authors said the findings need confirmation in controlled studies. Scalp pain should always be assessed, because it can be a sign of an inflammatory or scarring hair condition.

Side effects and risks

Reported side effects in scalp studies are usually mild and temporary ³:

• pain at the injection sites,
• headache,
• a feeling of heaviness or tightness in the forehead,
• small bruises, and
• rarely, temporary weakness of forehead muscles or a drooping eyebrow if toxin spreads to nearby muscles.

More serious effects are rare when the medicine is given correctly, but botulinum toxin is a potent prescription drug. Using unregistered or counterfeit products, or giving it in non-medical settings, increases risk. It is generally avoided in pregnancy and breastfeeding, and in people with some nerve or muscle disorders. A 2020 review also noted that botulinum toxin has been reported as both a possible treatment and a possible trigger of hair-related adverse effects, which is part of why it called the toxin a "double-edged sword" ⁷.

Cost and value

Scalp botox uses relatively large doses compared with a typical facial treatment, so it can be expensive, and the effect fades over months. This guide does not quote prices. Ask how many units will be used, the total cost per session, how often sessions would be repeated, and how results will be measured. Compare this with the cost and evidence of minoxidil and finasteride, and with other options such as PRP.

Who might consider it

Scalp botox might reasonably be discussed with a doctor if:

• you have a confirmed oily scalp that has not responded to sensible washing and shampoo changes, and you understand the effect may be temporary, or
• you have pattern hair loss, cannot use standard treatments, and accept that the evidence is experimental.

It is not a first step for hair loss with an unknown cause. Patchy hair loss, sudden heavy shedding, scaling, redness or pain should be assessed first. See hair loss treatment in Malaysia.

Life in Malaysia

Malaysia's heat and humidity mean many people feel their scalp gets greasy quickly, especially under a tudung, cap or motorcycle helmet. This can make "oil control" botox sound appealing. Before considering injections, it is worth checking basic routines: washing often enough with a gentle shampoo, drying the scalp properly before covering it, and treating dandruff if present. If you do have scalp botox, ask whether to avoid tight headwear, heavy exercise or lying down for some hours afterwards, as clinics often advise this to reduce spread. Botulinum toxin products should be registered for use in Malaysia, and injections should be given by a registered doctor ¹⁰.

Common myths

• "Botox blocks DHT, so it works like finasteride." This is a theory. It has not been shown to work like finasteride in people.
• "If it works for the forehead, it must work for hair." Relaxing muscles and growing hair are different effects.
• "Botox for oily scalp lasts for good." In the controlled trial, the effect faded by four to six months.
• "It will clear dandruff." A small study did not find a significant improvement in seborrhoeic dermatitis.
• "Botox is botox, wherever it is done." Product, dose and injector experience all matter.

Common mistakes

• Choosing scalp botox for hair loss before getting a diagnosis.
• Stopping minoxidil or finasteride in favour of injections.
• Not asking how many units will be used and what the full cost is.
• Having injections in a beauty salon or by a non-medical injector.
• Expecting oil control to last longer than a few months.
• Not taking baseline photos to compare results.

How a doctor assesses hair loss

A doctor will usually ask when hair loss started, about family history, medicines, diet, recent illness, childbirth or stress, and for women, periods. A scalp examination, often with a dermatoscope, helps identify pattern hair loss, inflammation or scarring. For oily scalp, a doctor may look for seborrhoeic dermatitis, acne-like bumps or signs of hormonal issues. Blood tests such as full blood count, ferritin and thyroid function may be suggested. Baseline photos make it easier to judge any treatment fairly.

Questions to ask your doctor

1. What is my diagnosis, and is scalp botox appropriate for it?
2. Is the goal less oil, more hair, or less scalp pain?
3. Which product will be used, and is it registered in Malaysia?
4. How many units, and what is the total cost per session?
5. How long is the effect expected to last, and how often would it be repeated?
6. What side effects should I watch for, including forehead or eyebrow weakness?
7. Should I continue or start minoxidil or finasteride alongside it?
8. How will results be measured, and when will progress be reviewed?

Bottom line

Scalp botox is used for two different problems, and the evidence differs for each. For oily scalp, one randomised, placebo-controlled trial found a temporary reduction in sebum for about three months. For pattern hair loss, a meta-analysis of small studies was encouraging, but a randomised trial found no benefit and reviews say the evidence is too variable to prefer it over established treatments. If you are considering it, get a clear diagnosis first, keep using proven treatments, ask exactly what will be injected and how much, and make sure the doctor is registered with the Malaysian Medical Council ¹⁰.

Frequently asked questions

Does botox work for hair loss?

The evidence is mixed. A 2025 meta-analysis of eight studies found a higher hair count with botulinum toxin than controls, but the studies were small, and a 2025 randomised trial in 15 men found no improvement in hair density after six months.

How is botox supposed to help hair?

Proposed ideas include relaxing scalp muscles to improve blood flow and oxygen to follicles, and effects on local DHT activity. These mechanisms are theories and have not been proven in people.

Can botox reduce an oily scalp?

A 2023 randomised, placebo-controlled study in 49 people found one session reduced scalp sebum in the treated area for about three months, with no difference by four to six months.

Does botox help dandruff or seborrhoeic dermatitis?

Not clearly. A small 2023 study in 20 people found no significant improvement in seborrhoeic dermatitis symptoms one month after injection. Standard antifungal shampoos remain the usual first step.

Is scalp botox safe?

Side effects reported in studies are usually mild, such as injection pain, headache and temporary forehead heaviness. It must be given by a trained doctor, because botulinum toxin is a prescription medicine.

How long does scalp botox last?

In the oily-scalp trial, the effect lasted about three months. For hair loss, there is no agreed schedule or duration, and repeat treatments add cost.

Is botox better than minoxidil or finasteride?

No good evidence shows this. Minoxidil, and finasteride for suitable men, remain the better-studied options for pattern hair loss.

Who should avoid scalp botox?

People who are pregnant or breastfeeding, have certain nerve or muscle disorders, allergy to the product, or infection at the injection site should not have it without specialist advice. A doctor should confirm the cause of hair loss first.

Educational content. Not medical advice.