The use of apple cider vinegar (ACV) to treat dandruff is not backed by strong scientific research, though some anecdotal reports suggest it may offer scalp benefits. These potential benefits include helping to balance scalp pH, encouraging the shedding of dead skin cells, and reducing fungal growth on the scalp.

A 2022 review noted that ACV might help relieve dry scalp, which can sometimes mimic dandruff. However, because dry scalp and dandruff have different causes, it’s unclear whether ACV is effective for either condition. More research is needed to clarify its specific role in treating scalp issues.

ACV does appear to have some antifungal and antibacterial properties that could promote general skin health. Certain bacteria, such as Staphylococcus, may be linked to dandruff, and dandruff itself is sometimes confused with fungal infections. ACV’s antimicrobial qualities could theoretically be beneficial in these cases.

That said, studies show that not all microbes are equally affected by ACV. For instance, while undiluted ACV is effective against certain bacteria, it’s less potent against Candida yeast at a 25% concentration. This highlights the need for more research into how ACV interacts with different pathogens on the skin.

To try ACV for dry scalp, experts recommend mixing two parts ACV with one part water. Apply the mixture to the scalp, wait 15 minutes, then rinse with warm water. This can be done up to twice a week.

It’s important to consult a doctor before trying ACV topically and to stop use if irritation or unusual skin reactions occur.