Is Cider Vinegar Good for Your Hair?

Apple cider vinegar (ACV) can improve how your hair looks and feels in certain situations, but it cannot treat hair loss or regrow hair. There is no clinical evidence supporting it as a remedy for any form of alopecia, and neither NICE nor the NHS recommend it for this purpose.

What ACV can genuinely do#

ACV is acidic, sitting at a pH of around 2 to 3. Healthy hair has a natural pH of roughly 3.7 to 5.5. When hair becomes too alkaline (from hard water, heat styling, or alkaline shampoos), the cuticle lifts, leaving strands looking dull, frizzy, and more prone to breakage. Rinsing with a diluted ACV solution can temporarily lower the pH of the hair shaft, which helps the cuticle lie flat again. The result is shinier, smoother hair.

ACV also has antimicrobial properties. Research shows acetic acid can inhibit bacteria including Staphylococcus aureus (a common cause of folliculitis, a scalp condition linked to hair shedding) and Candida albicans (associated with dandruff-causing fungal overgrowth). For people with a flaky or irritated scalp driven by seborrhoeic dermatitis, a diluted ACV rinse may offer some cosmetic relief. Do not expect visible improvement overnight; cosmetic effects take consistent use over several weeks.

For people in hard water areas (much of South East England, the Midlands, and East Anglia), ACV rinses are often recommended to dissolve mineral deposits left by limescale. There is no controlled trial specifically testing this, but the chemistry is plausible: acetic acid can react with calcium and magnesium deposits, which may reduce the dullness and brittleness that hard water causes.

Where ACV falls short#

The most common causes of significant hair thinning are androgenetic alopecia (male and female pattern hair loss, driven by the hormone DHT), telogen effluvium (a shedding phase triggered by stress, illness, or hormonal shifts such as post-partum recovery or perimenopause), and alopecia areata (an autoimmune condition). ACV has no mechanism to address any of these. It cannot block DHT, correct hormonal imbalances, or modulate immune responses.

If you are losing hair rather than just noticing dull or frizzy hair, the cause matters far more than your rinse. Women experiencing hair thinning after pregnancy or around the menopause, or those with PCOS-related hair changes, should speak to their GP. Blood tests for thyroid function, ferritin, and hormone levels can identify treatable causes that ACV will do nothing to fix.

How to use ACV safely#

Concentration matters. Undiluted ACV is caustic enough to burn skin. A 2015 case report documented a chemical burn from undiluted vinegar applied to skin. Use a ratio of 1 part ACV to 10 parts water as a starting point. Apply to the scalp and hair after shampooing, leave for two minutes, then rinse thoroughly. Once or twice a week is enough. Avoid contact with eyes.

If you use a topical hair loss treatment such as minoxidil, apply it to a dry scalp after your ACV rinse has been fully rinsed out. There is no evidence that ACV directly reduces minoxidil's effectiveness, but applying any product to a still-acidic, damp scalp before minoxidil has absorbed is not good practice.

Pre-formulated ACV shampoos and rinses are generally safer than DIY dilutions because the pH is controlled during manufacturing. If you have sensitive skin or a history of scalp reactions, a formulated product carries less risk than guessing your own dilution.

Hair types and ACV#

ACV rinses tend to benefit people with coarse, colour-treated, or hard-water-damaged hair. For fine or low-porosity hair, frequent use can over-smooth the cuticle and leave hair limp. People with natural or textured hair types should use ACV cautiously and less often, as the acidity can affect curl pattern and moisture retention if overdone.

If you want to understand what is actually driving your hair loss rather than managing the cosmetics, the Totiva guide on the hair growth cycle explains how each phase works and what disrupts it. For men with pattern hair loss, finasteride and minoxidil together covers the two treatments with the strongest clinical evidence.