Apple cider vinegar for hair: rinse, mask, and serum, does it really work

Apple cider vinegar rinses have been returning in care guides for years, usually with the same justification: the acidic pH is supposed to close the hair scales and restore shine. It sounds like chemistry, so it's hard to argue with it. However, when one starts looking for studies that measured this, it becomes empty. A literature review published in 2025 in the journal Cutis searched for studies on vinegar rinses and described a clear lack of data. The only published study on diluted vinegar on human skin ended with irritation in most participants, even at a concentration that guides describe as completely safe. Below, we separate what has actually been measured from what is repeated without measurement: where the argument about pH comes from, what really causes dandruff, and in what situations vinegar on the scalp can be dangerous.

KEY INFORMATION
• The literature review did not find any scientific papers evaluating the method of apple cider vinegar rinsing (Ogah and Kindred, Cutis, 2025).
• In the study of diluted vinegar on the skin, irritation was reported by 16 out of 22 people (Luu et al., Pediatric Dermatology, 2019).
• In the analysis of 123 shampoos, the pH ranged from 3.5 to 9.0, and the target value for hair is not established (Gavazzoni Dias et al., 2014).
• Undiluted vinegar has been described in dermatology as a cause of chemical burns.

What does an acidic reaction do to hair?

It changes the electric charge of the fiber's surface, rather than closing the scales. The authors of the analysis of 123 shampoos describe that an alkaline reaction increases the negative charge on the surface of the hair. This increases friction between the fibers, and from friction come cuticle damage and brittleness. A lower pH weakens this effect.

The work of Gavazzoni Dias and colleagues in the International Journal of Trichology (2014) measured the pH of 123 shampoos from international brands. The values ranged from 3.5 to 9.0. About 38 percent of the products had a pH of 5.5 or lower, while the rest were higher. All tested children's shampoos had a pH above 5.5, as the tear-free formula requires it. The authors declared no funding and no conflict of interest.

However, more important is the statement from the conclusions that is never mentioned in guides: there is no established target pH value, and studies needed to determine the best range for hair and scalp should still be conducted. Therefore, the popular statement about the optimal pH of hair being around 4 to 5 has no basis in this work, even though it is most often cited in connection with it.

There is also a difference that is easy to overlook. The analysis concerns shampoos, not vinegar. No one measured the rinse in it, compared it to a conditioner, or checked how long the effect lasts. Transferring the conclusion from one product to another is an assumption, not a result. What can be expected from washing itself, we described in the text. Hemp shampoo: properties for hair loss.

Has anyone studied vinegar rinses on hair?

We did not find such a study. In 2025, Ogah and Kindred published a literature review in the journal Cutis dedicated specifically to the method of apple cider vinegar rinsing. The authors' conclusion is unequivocal: the literature shows a clear lack of scientific papers evaluating this practice, and appropriate studies are still needed.

This review has a limitation worth knowing. It concerned synthetic hair extensions, where vinegar rinsing functions as a home remedy to reduce skin reactions and contact with synthetic compounds. This is not a review about hair in general. However, the direction of the conclusion remains the same, which ends every inquiry we make to literature databases: there are simply no papers on rinses.

Therefore, you will not find here any proportions, holding times, or schedules. All such numbers circulating in guides, from a tablespoon per liter to three times a week, do not come from measurement. Presenting them alongside assurances of safety would suggest knowledge that no one has gathered.

It is also worth checking the arithmetic of these recipes. In the Luu study, a solution with a concentration of 0.5 percent acetic acid was created by mixing one part of apple cider vinegar with nine parts of water. Two tablespoons of vinegar dissolved in a liter of water is a dilution over three times further, resulting in an acetic acid concentration of around 0.15 percent. Guides describe the same solution as one or two percent. The mistake by an order of magnitude has been repeated for years and shows how little these recipes have in common with measurement.

What is known about apple cider vinegar and dandruff?

We did not find any clinical studies. However, it is well known what drives dandruff. Dawson described in 2007 in the Journal of Investigative Dermatology Symposium Proceedings, that on the scalp with dandruff, Malassezia globosa and Malassezia restricta prevail, rather than the Malassezia furfur mentioned in guides.

In the same work, the author indicates three conditions on which dandruff simultaneously depends: sebum, yeast metabolism, and individual susceptibility. Oleic acid alone can cause flaking resembling dandruff. Malassezia globosa is the most likely initiating organism, as it has high lipase activity, and the presence of this lipase has been demonstrated on human scalp.

The claim that vinegar inhibits these yeasts has no source that we could find. The most frequently cited work on the antimicrobial properties of apple cider vinegar (Yagnik i wsp., Scientific Reports, 2018) It examined the colon bacillus, Staphylococcus aureus, and Candida albicans. In its full text, the word Malassezia is not mentioned even once, just like the word dandruff. The conclusion about dandruff was therefore appended to a paper that says nothing about it.

The practical consequence is straightforward. Anti-dandruff shampoos have undergone studies with random assignment, while vinegar rinses have not. Piérard-Franchimont and colleagues (Skin Pharmacology and Applied Skin Physiology, 2002) compared a shampoo with 2 percent ketoconazole and 1 percent zinc pyrithione in 331 individuals with severe dandruff or seborrheic dermatitis. After four weeks, the severity of symptoms decreased by 73 percent in the ketoconazole group and by 67 percent in the zinc pyrithione group, with minimal side effects. In cases of persistent flaking, redness, or itching of the scalp, a dermatologist decides, not a home experiment.

When does apple cider vinegar harm the scalp?

When it comes into contact with the skin at a concentration that no one has tested on hair. In the only published study of diluted vinegar on human skin, most participants reported irritation. Undiluted vinegar has been described in dermatological literature as a cause of chemical burns, even in children.

Luu and colleagues (Pediatric Dermatology, 2019) they gathered 22 individuals: eleven with atopic dermatitis and eleven healthy. Each participant soaked one forearm in a solution with a concentration of 0.5 percent acetic acid, and the other in water, for ten minutes daily over fourteen days. Trans epidermal water loss increased, and pH decreased immediately after the treatment, but the effect disappeared after an hour. Mild side effects were reported by 16 out of 22 individuals, or 72.7 percent, and subsided after discontinuation. The authors' conclusion: diluted vinegar does not improve skin barrier integrity, but irritates it in most subjects. The study was conducted at an academic center, and its repetition in 2021 was funded by the University of Virginia, not the vinegar manufacturer.

Burns from vinegar have been described in at least three independent reports. Korkmaz et al. (Pediatric Dermatology, 2000) they presented a chemical burn in a newborn to whom vinegar was applied to the skin to reduce fever. Bunick et al. (Journal of the American Academy of Dermatology, 2012) described a burn after the topical application of apple cider vinegar. Feldstein et al. (The Journal of Clinical and Aesthetic Dermatology, 2015) they described a burn after using vinegar according to an online guide for self-removal of moles.

The scalp is no safer than the forearm or the face. We discuss the same raw material in its cosmetic version for the skin in the text. Apple cider vinegar for skin and face, and we write about plant oils for the scalp in the text. Hemp oil for hair and scalp.

Frequently Asked Questions

Does apple cider vinegar close the hair cuticles?

We did not find a study that measured this. An analysis of 123 shampoos (Gavazzoni Dias et al., 2014) describes a different mechanism: an alkaline reaction increases the negative charge on the surface of the fiber and friction between the hairs, while a lower pH weakens this effect. This is not closing the cuticles and does not pertain to vinegar.

How much apple cider vinegar to add to water?

We do not provide proportions, as there is no study from which it could be derived. A review from 2025 (Ogah and Kindred, Cutis) states a clear lack of works on this method. The numbers circulating in guides do not come from measurement and can be exaggerated by an order of magnitude.

Does apple cider vinegar help with dandruff?

We did not find a clinical study. Dandruff is driven by the yeasts Malassezia globosa and Malassezia restricta (Dawson, 2007), and in the full text of the most frequently cited work on vinegar (Yagnik et al., 2018), the word Malassezia does not appear even once. Effectiveness has been demonstrated for shampoos with ketoconazole and zinc pyrithione in 331 individuals (Piérard-Franchimont et al., 2002).

Does apple cider vinegar harm colored hair?

We did not find any studies on the effect of vinegar on color durability, neither in one direction nor the other. Opinions about sealing scales and accelerated fading circulate together, although they contradict each other, and neither has any measurement behind it.

Does apple cider vinegar accelerate hair growth?

There is no data from studies on humans. A review from 2025 (Ogah and Kindred, Cutis) did not find any studies evaluating vinegar rinses for any hair-related indications. When it comes to hair loss, the diagnosis by a dermatologist is decisive, as there are many causes and they differ in treatment.

Can apple cider vinegar burn the scalp?

Undiluted vinegar has been described as a cause of chemical burns to the skin in at least three reports, including one involving a newborn (Korkmaz et al., 2000) and after the use of apple cider vinegar (Bunick et al., 2012). Even when diluted to 0.5 percent, it irritated the skin of most participants.

The u Bucha store does not offer either shampoo or vinegar rinse, and apple cider vinegar is available only as an oral supplement. Cosmetics for skin and hair are gathered in the category. cosmetics (stan na 16 sierpnia 2026).

The article is informational and educational in nature and does not replace consultation with a doctor. If you are pregnant, breastfeeding, taking medications, or have chronic conditions, consult the use of supplements or herbs with a specialist.

Author: Michał Waluk · Opublikowano: 2026-06-08 · Aktualizacja: 2026-08-16