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

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Synopsis

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

Tea tree oil (Melaleuca alternifolia) is used in various hair care products to help manage dandruff, with support from both tradition and modern research. The primary basis for its use against dandruff is its antimicrobial and antifungal properties, particularly against Malassezia species, which are implicated in dandruff and seborrheic dermatitis. Several studies have explored its efficacy: a notable randomized, double-blind, placebo-controlled trial published in the Journal of the American Academy of Dermatology (Satchell et al., 2002) found that a 5% tea tree oil shampoo used for four weeks significantly improved dandruff symptoms compared to placebo, including reductions in itchiness and greasiness. The presumed mechanism is the inhibition of fungal growth and reduction of scalp inflammation. Despite these findings, the evidence base is still modest, with relatively few large-scale or long-term trials. Safety concerns are generally minimal when used topically in diluted concentrations, though skin irritation or allergic reactions can occur in some individuals. In summary, tea tree oil’s use for dandruff has a foundation in both tradition and scientific literature, with moderate-quality evidence supporting its effectiveness as an adjunctive topical treatment.

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Products containing Tea Tree

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