Tea tree oil
Tea tree oil is the rare trend with actual acne trials behind it: at about 5%, it beat a placebo and worked roughly as well as benzoyl peroxide, just slower and gentler. So why 'caution' and not 'good'? Two reasons. Reviewers still call the overall proof shaky. And, bigger deal, tea tree oil is a known allergy trigger, especially once a bottle oxidizes with age. Never dab it on undiluted. If you try it, use a low-strength product and stop if your skin gets angry.
what the evidence says
Two RCTs support ~5% tea tree oil for mild-to-moderate acne (comparable to benzoyl peroxide, slower); a systematic review calls the evidence not compelling, and oxidized or undiluted oil is a recognized contact allergen.
can you use it with…
- Benzoyl peroxideCareful
Double the drying, not the results
- AdapaleneCareful
Your retinoid did not ask for backup
sources
- 1.Indian Journal of Dermatology, Venereology and Leprology · The efficacy of 5% topical tea tree oil gel in mild to moderate acne vulgaris: a randomized, double-blind placebo-controlled study (2007)
- 2.Medical Journal of Australia · A comparative study of tea-tree oil versus benzoylperoxide in the treatment of acne (1990)
- 3.Forschende Komplementärmedizin und Klassische Naturheilkunde · Tea tree oil: a systematic review of randomized clinical trials (2000)
- 4.Contact Dermatitis · Tea tree oil: contact allergy and chemical composition (2016)
note:Skinformed is general education, not medical advice. It doesn't know your skin, can't diagnose anything, and is no substitute for a clinician. If something on your skin hurts, spreads, or worries you, that's a doctor visit, not a product search.