Apple cider vinegar rinses have been used for generations as a simple, natural approach to hair care, typically involving diluted apple cider vinegar applied as a final rinse after shampooing. Research suggests that the acetic acid in apple cider vinegar may help lower the pH of hair and the scalp, which could smooth the hair cuticle, reduce frizz, and enhance shine, since healthy hair tends to thrive in a slightly acidic environment. Studies indicate that high-alkalinity hair products can lead to increased friction, breakage, and dullness, so a mildly acidic rinse may help counteract those effects. While scientific literature specifically on apple cider vinegar hair rinses remains limited, the underlying chemistry of pH balance and cuticle health lends some plausibility to this long-standing folk practice.
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