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Tto5.0
Tea Tree Oil (topical) Research
Mostly mechanism / observationalModerate safety
6 peer-reviewed studies
What the evidence says
Mostly mechanism / observational
Most Tea Tree Oil (topical) studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from mixed-quality randomised trials published 1990–2021 with a typical study size of 60 participants.
Based on 6 studies · 2 RCTs · 202 total participants
Confidence
Low
By outcome
Safety profile
Mostly mechanism / observational3 studies
Skin healthReduces acne lesions comparably to benzoyl peroxide but more slowly; a gentle botanical option for mild acne (cosmetic) · 8-12 weeks
Too few graded studies2 studies
Steady research
1 study in the last 5 years
199020052021
1Systematic Review2015
Data from a single trial showed potential benefit of tea tree oil compared with placebo in improving total skin lesion counts (MD -7.53, 95% CI -10.40 to -4.66, 60 participants, 1 trial, low quality of evidence) and acne severity scores (MD -5.75, 95% CI -9.51 to -1.99, 60 participants, 1 trial).
Cao H, Yang G, Wang Y, Liu JP, Smith CA, Luo H, Liu Y · Cochrane Database Syst Rev (2015)
both 5% tea-tree oil and 5% benzoyl peroxide had a significant effect in ameliorating the patients' acne by reducing the number of inflamed and non-inflamed lesions (open and closed comedones), although the onset of action in the case of tea-tree oil was slower. Encouragingly, fewer side effects were experienced by patients treated with tea-tree oil.
Bassett IB, Pannowitz DL, Barnetson RS · Med J Aust (1990)
Single-blind RCT in 124 patients comparing 5% tea tree oil gel with 5% benzoyl peroxide lotion for mild-to-moderate acne
Both significantly reduced inflamed and non-inflamed lesion counts
Tea tree oil had a slower onset of action but fewer side effects than benzoyl peroxide
In terms of TLC and ASI, tea tree oil gel was 3.55 times and 5.75 times more effective than placebo respectively. Side-effects with both groups were relatively similar and tolerable.
Enshaieh S, Jooya A, Siadat AH, Iraji F · Indian J Dermatol Venereol Leprol (2007)
Randomized double-blind placebo-controlled trial (n=60) of 5% tea tree oil gel vs placebo over 45 days
Tea tree oil was significantly more effective than placebo on total lesion count (3.55x) and acne severity index (5.75x)
Side effects were similar between groups and tolerable
MIC values of the tea-tree oils and terpinen-4-ol were lower for P. acnes than for the two staphylococci. This study supports the use of tea-tree oil in the treatment of acne, and demonstrates that terpinen-4-ol is not the sole active constituent of the oil.
Raman A, Weir U, Bloomfield SF · Lett Appl Microbiol (1995)
In-vitro study of tea tree oil and its components against acne-relevant skin bacteria
Tea tree oil, terpinen-4-ol, alpha-terpineol and alpha-pinene were active against S. aureus, S. epidermidis and P. acnes; cineole was inactive
MIC values were lower (more potent) against P. acnes than against staphylococci — a mechanistic basis for anti-acne activity
Increased use has led to increasing reports of allergic contact dermatitis (ACD), a delayed-type hypersensitivity reaction to allergens in sensitized individuals.
Sindle A, Martin K · Int J Womens Dermatol (2021)
Review highlighting that popular essential oils, including tea tree, are not necessarily safe despite being 'natural'
Rising use has driven increasing reports of allergic contact dermatitis (delayed-type hypersensitivity)
Essential-oil composition is complex; clinicians should ask about essential-oil use in suspected contact dermatitis — the key safety caveat
Mean total lesion counts were 23.7 at baseline, 17.2 at 4, 15.1 at 8 and 10.7 at 12 weeks. Total lesion counts differed significantly over time by repeated measures anova (P < 0.0001).
Malhi HK, Tu J, Riley TV, Kumarasinghe SP, Hammer KA · Australas J Dermatol (2017)
Open-label, uncontrolled 12-week phase II pilot of a tea tree oil gel and face wash applied twice daily (n=18)
Mean total facial lesion counts fell from 23.7 to 10.7 (significant over time, P<0.0001)
No serious adverse events; minor local effects (peeling, dryness, scaling) resolved without intervention