Evidence supporting the use of: Tea Tree Oil
For the health condition: Dandruff

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Tea Tree Oil, derived from the leaves of Melaleuca alternifolia, is commonly included in shampoos and scalp treatments marketed for dandruff. The rationale for its use is scientifically substantiated, though evidence is moderate rather than robust. Dandruff is frequently associated with the proliferation of Malassezia species, a type of yeast that colonizes the scalp. Tea Tree Oil exhibits documented antifungal and antimicrobial activity, notably against Malassezia species.

A key clinical study published in the journal Journal of the American Academy of Dermatology (Satchell et al, 2002) found that a 5% tea tree oil shampoo used daily for four weeks significantly reduced dandruff severity, scalp itchiness, and greasiness compared to placebo. The proposed mechanism involves terpinen-4-ol, the main active component of tea tree oil, which disrupts fungal cell membranes. Several in vitro studies corroborate its antifungal effects, though these are less directly translatable to clinical outcomes.

It is important to note that while results are promising, the body of clinical evidence is limited, with relatively few high-quality, large-scale randomized controlled trials. Mild adverse reactions such as irritation or allergic contact dermatitis can occur. Overall, tea tree oil is justified for dandruff based on current scientific evidence, but more research is needed to establish optimal concentrations and long-term efficacy.

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Products containing Tea Tree Oil

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