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Head-to-head evidence comparison — which supplement is right for you?
Azelaic Acid wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both Azelaic Acid and Tea Tree Oil (topical) have evidence — compare verdict strength side-by-side.
Topical only. OTC cosmetic azelaic acid is typically around 10%; prescription strengths are 15% gel/foam (rosacea) and 20% cream (acne), applied as a thin layer to clean skin once or twice daily. There is no oral, injectable, or systemic dose. For rosacea or persistent acne, the prescription form under a clinician is the evidence-based route. This library does not provide an ingestion protocol.
any
Leave-on topical gel, foam, or cream (OTC ~10%, or prescription 15-20%)
Topical cosmetic only. Acne trials used a 5% tea tree oil gel applied to affected areas (typically twice daily). Avoid undiluted (100%) application, which is more irritating and sensitizing. Patch-test first, and use fresh, properly stored product (oxidized oil raises allergy risk). There is no oral or systemic dose — it is not ingested (and tea tree oil is toxic if swallowed). This library does not provide an ingestion protocol.
any
5% tea tree oil gel (the trial-tested strength)
Throughout
4-15 weeks
8-24 weeks
4-12 weeks
Throughout
8-12 weeks
Weeks
Throughout
Efficacy and safety of azelaic acid (15%) gel as a new treatment for papulopustular rosacea: results from two vehicle-controlled, randomized phase III studies.
J Am Acad Dermatol (2003) · Rct · n=664
Two double-blind, vehicle-controlled phase III RCTs (664 patients total) of 15% azelaic acid gel twice daily for moderate papulopustular rosacea
A comparison of 15% azelaic acid gel and 0.75% metronidazole gel in the topical treatment of papulopustular rosacea: results of a randomized trial.
Arch Dermatol (2003) · Rct · n=251
Multicenter, double-blind, randomized head-to-head trial in 251 patients with moderate papulopustular rosacea over 15 weeks
Interventions for rosacea.
Cochrane Database Syst Rev (2015) · Systematic review
Cochrane review of 106 RCTs (13,631 participants) of rosacea treatments with GRADE quality assessment
A comparative study of tea-tree oil versus benzoylperoxide in the treatment of acne.
Med J Aust (1990) · Rct · n=124
Single-blind RCT in 124 patients comparing 5% tea tree oil gel with 5% benzoyl peroxide lotion for mild-to-moderate acne
The efficacy of 5% topical tea tree oil gel in mild to moderate acne vulgaris: a randomized, double-blind placebo-controlled study.
Indian J Dermatol Venereol Leprol (2007) · Rct · n=60
Randomized double-blind placebo-controlled trial (n=60) of 5% tea tree oil gel vs placebo over 45 days
Tea tree oil gel for mild to moderate acne; a 12 week uncontrolled, open-label phase II pilot study.
Australas J Dermatol (2017) · Pilot · n=18
Open-label, uncontrolled 12-week phase II pilot of a tea tree oil gel and face wash applied twice daily (n=18)
Azelaic Acid has a higher evidence score (7.5/10 vs 5/10) and wins in 2 of 3 categories.
For clearer skin (acne), Azelaic Acid has a higher relevance score (70 vs 62).
No known interactions between Azelaic Acid and Tea Tree Oil (topical) have been documented in our database. However, always consult a healthcare provider before combining supplements.