Is Apple Cider Vinegar Good for Your Hair? UK Evidence | Complete Nutrition

Apple Cider Vinegar

Is apple cider vinegar good for your hair?

Weak evidence. Properly diluted ACV rinses (1 part ACV to 4 parts water) may help with scalp pH balance, product buildup and mild dandruff. The evidence is mostly anecdotal. No good clinical trials support claims that ACV grows hair, thickens hair or treats serious scalp conditions. For genuine hair loss or persistent scalp problems see a GP or dermatologist for evidence-based treatment.

Visit the ACV Hub Shop ACV Gummies (oral use)

Updated:
May 2026

Written by:
Dominic Walton, MD

Reading time:
7 min

The full answer

What ACV can and cannot do for hair

The ACV hair claim sits firmly in the anecdotal corner of the wellness market. There is a plausible mechanism. The clinical trial evidence is missing. Four points cover the honest position.

1. The pH mechanism is plausible

Healthy scalp pH sits around 4 to 5 (mildly acidic). Many shampoos are alkaline which can disturb the cuticle and the scalp microbiome. ACV at proper dilution sits around pH 3 to 4 which is close to the scalp's natural range. A rinse can restore acidic conditions after an alkaline shampoo. Cleveland Clinic notes this mechanism. Whether it translates to visible improvement in hair appearance varies between people.

2. The antimicrobial effect can help mild dandruff

Dandruff is partly caused by overgrowth of Malassezia yeast on the scalp. Acetic acid has antimicrobial activity against various skin yeasts and bacteria. Diluted ACV rinses may reduce mild dandruff symptoms in some people through this mechanism. Healthline confirms the theory is sound but notes that controlled clinical trials specifically testing ACV for dandruff are absent. Medicated anti-dandruff shampoos (ketoconazole, selenium sulfide, zinc pyrithione) have stronger evidence.

3. The buildup removal claim is real

Hair products (styling products, dry shampoos, conditioners with silicones) accumulate on the hair over time. The acidic action of ACV can dissolve some of this buildup leaving hair feeling cleaner and looking shinier. This is a real but cosmetic effect not a hair health benefit per se. Clarifying shampoos do the same job often with less risk of dryness or irritation.

4. The hair growth and thickness claims have no good evidence

The popular claims that ACV makes hair grow faster, thicker, longer or fuller are not supported by clinical trials. Hair growth is determined by genetics, hormones (androgens, thyroid), age, nutrition and scalp health. ACV does not contain hair growth stimulants. ACV may improve scalp health in some people which could in theory remove an obstacle to normal growth but it cannot produce growth above genetic baseline. For genuine hair loss minoxidil (Rogaine) and finasteride (Propecia) have strong evidence and are the appropriate options under GP or dermatologist guidance.

If you want to try it

How to do an ACV hair rinse safely

Five rules for sensible ACV hair use. Skip ACV entirely if you have scalp dermatitis, eczema, psoriasis, open cuts on the scalp or freshly coloured hair.

Use 1 part ACV to 4 parts water minimum

The standard recipe is 1 to 2 tablespoons of ACV in 240 ml of cool water. More dilute is safer for sensitive scalps. Undiluted or weakly diluted ACV will dry the hair and irritate the scalp. A squeeze bottle makes application easier.

Apply after shampooing not instead of it

ACV is a rinse not a cleanser. Shampoo first to remove oil and dirt then pour the ACV mixture over the scalp and hair. Massage into the scalp for 30 to 60 seconds. Leave for 2 to 5 minutes. Rinse thoroughly with cool water. Follow with conditioner if needed.

Use weekly at most

Once a week is the most commonly recommended frequency. Some people tolerate every 2 weeks better especially with dry or damaged hair. Daily use will strip natural oils and dry the hair regardless of dilution. Adjust based on how your hair and scalp respond.

Avoid contact with eyes and broken skin

ACV stings on contact with eyes and any cuts, abrasions or active dermatitis. Keep the eyes closed during application and rinse thoroughly. If irritation develops stop immediately. People with sensitive skin should patch-test on a small area first before full scalp application.

Stop if hair becomes dry, brittle or scalp itchy

Persistent dryness, brittleness, breakage or new scalp itching are signs that ACV is not working for your hair. Stop and let the hair recover. Many people find ACV does not suit their hair type especially fine, dry or chemically processed hair. The benefit was never strong evidence. The cost of stopping is nothing.

Oral use only

Our ACV gummies are an oral supplement not a hair product

Our Apple Cider Vinegar Gummies are an oral daily supplement for the documented blood sugar and satiety benefits of acetic acid. They are not formulated for topical or hair use. If you want to try ACV on hair use plain liquid raw unfiltered ACV from a supermarket diluted in water as a weekly rinse. If you take our gummies for general health they do what they are designed to do which is internal not topical.

Shop ACV Gummies (oral use)

To be clear about the products. Our Apple Cider Vinegar Gummies are an oral supplement for blood sugar and satiety benefits. They are not a hair product. For ACV hair use buy plain liquid ACV separately and dilute as described. Our gummies serve a different purpose entirely.

Safety

When ACV use on hair becomes a problem

ACV at proper dilution and weekly frequency is generally safe for healthy scalps. The exceptions are predictable. Stop ACV hair use and see your GP or dermatologist if any of the following apply.

New or worsening scalp itching, burning or redness after starting ACV rinses.
Hair dryness, brittleness or breakage that persists for more than 2 weeks after stopping.
Open sores, weeping or crusting on the scalp which can indicate dermatitis, infection or another condition needing proper treatment.
Eye irritation from accidental contact during application. Rinse thoroughly with water and see a doctor if symptoms persist.
Faded or uneven hair colour after rinses on coloured hair. ACV can strip semi-permanent dyes.

For diagnosed hair loss (male or female pattern baldness, telogen effluvium, alopecia areata) ACV is not an effective treatment. See a GP or dermatologist for evidence-based options. Delaying proper treatment to try ACV can mean lost opportunity for hair preservation.

For the wider picture on apple cider vinegar from documented benefits to safe dosing and the science behind acetic acid, our Understanding Apple Cider Vinegar hub brings every guide together in one place.

Part of the hub

Back to the Apple Cider Vinegar Hub

This article sits inside our complete knowledge base on apple cider vinegar covering benefits, dosing, side effects and the science behind ACV. Head back to the hub for the full index.

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Keep reading

More on cosmetic ACV claims

Hair is one of several cosmetic ACV claims with weak evidence. Our piece on common myths about apple cider vinegar debunked covers the oversold claims. Is apple cider vinegar good for you covers the overall evidence picture. And is apple cider vinegar healthy covers the related health framing.

Frequently asked

ACV and hair questions

Is apple cider vinegar good for hair?

Weak evidence. Diluted ACV rinses (1 part ACV to 4 parts water) may help with scalp pH balance, product buildup and mild dandruff. Cleveland Clinic and Healthline both note the evidence is mostly anecdotal. No good clinical trials support claims that ACV grows hair, thickens hair or treats serious scalp conditions. The pH and antimicrobial mechanisms are biologically plausible but the trial evidence is missing.

How do I do an ACV hair rinse?

Mix 1 to 2 tablespoons of ACV with 240 ml of water in a cup or squeeze bottle. After shampooing pour the mixture slowly over the scalp and hair. Massage into the scalp for 30 to 60 seconds. Leave for 2 to 5 minutes. Rinse thoroughly with cool water. Use once a week at most. Daily use can dry the hair and irritate the scalp.

Does ACV make hair grow faster?

No good evidence. Hair growth is determined by genetics, hormones, age, nutrition and scalp health. ACV may improve scalp health in some people which could in theory remove an obstacle to normal hair growth. ACV does not contain hair growth stimulants. Claims that ACV grows hair faster or thicker are not supported by clinical trials. For genuine hair loss see a GP or dermatologist for evidence-based options like minoxidil or finasteride.

Can ACV cure dandruff?

Mild dandruff may respond to ACV rinses because the antimicrobial action targets the Malassezia yeast involved in dandruff. Healthline notes the evidence is anecdotal not clinical. Moderate to severe dandruff or persistent scalp flaking needs evidence-based treatment (ketoconazole shampoo, selenium sulfide, zinc pyrithione, coal tar). Speak to a pharmacist or GP for persistent symptoms rather than relying on ACV alone.

Will ACV damage my hair?

Undiluted ACV can damage hair and scalp by stripping natural oils, drying the hair shaft and irritating the scalp. Properly diluted ACV (1 part ACV to 4 parts water minimum) used weekly or less is generally safe. Over-use even at proper dilution can dry out hair over time. Coloured or chemically treated hair is more vulnerable. Stop immediately if you notice increased dryness, frizz, breakage or scalp irritation.

Is ACV safe for coloured hair?

Use with extreme caution. The acidic pH of ACV can fade hair colour faster especially for semi-permanent and direct dyes. Some people find ACV neutralises the brassy tones that develop in coloured hair which is the opposite effect. The result depends on the specific dye and colour. Test on a small section first. If you have just had your hair coloured wait at least 2 weeks before using ACV rinses.

How often should I use ACV on my hair?

Once a week is the most commonly recommended frequency. Some people find every 2 weeks is enough. Daily use will dry out the hair and irritate the scalp regardless of dilution. People with naturally oily hair may tolerate weekly use. People with dry or damaged hair should start every 2 weeks and increase only if hair tolerates it. Adjust based on how your hair and scalp respond over 4 to 6 weeks of use.