π Common Names (6 Languages)
β Evidence-Based Benefits
Premier topical antimicrobial for skin conditions. Meta-analysis shows 5% tea tree oil effective for acne - comparable to 5% benzoyl peroxide with fewer side effects (PMID: 26986033). RCTs demonstrate efficacy for fungal nail infections, athlete's foot, and dandruff (PMID: 23768146). Effective against MRSA and antibiotic-resistant organisms. Used in wound care and oral health. TOPICAL USE ONLY - toxic if ingested.
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π¬ Clinical Trials & Evidence
βοΈ Evidence-Based Research: Clinical trials provide the highest level of evidence for herbal efficacy and safety. The trials listed below represent peer-reviewed research registered on ClinicalTrials.gov. Each trial includes detailed protocols, patient populations, interventions tested, and measurable outcomes. Click links to access full trial details and published results.
Meta-analysis: Acne treatment comparable to benzoyl peroxide
Review: Fungal infection efficacy validated
π Find More Clinical Trials
Search for additional ongoing and completed trials investigating this herb's therapeutic effects:
π‘ Research Tip: Use both common name and scientific name when searching for comprehensive results. Filter by "Completed" trials to find published outcomes.
π Drug Interactions
β οΈ CRITICAL SAFETY INFORMATION
Herb-drug interactions can be serious and potentially life-threatening. Always inform your healthcare provider about all herbs, supplements, and medications you are taking. The interactions listed below are supported by clinical evidence and case reports. Citations link to peer-reviewed research on PubMed.
π Evidence-Based Interactions: Each interaction below includes research citations (PMID links) documenting the mechanism, clinical significance, and management recommendations. Click citations to access full studies.
Topical Medications
Effect: May enhance skin irritation when combined
Action: Use cautiously with other topical treatments. Apply at different times
Photosensitizing Medications
Effect: May increase sun sensitivity
Action: Use sunscreen. Avoid excessive sun exposure
π Key Interaction Databases & Resources
- Natural Medicines Database: Professional herb-drug interaction checker
- PubMed: Search for latest interaction research
- Drugs.com: Drug interaction checker
- Micromedex: Hospital-grade interaction database (subscription required)
π‘ Clinical Tip: Show your healthcare provider this page and the linked research citations when discussing potential interactions.
β οΈ Safety Information
Adverse Events
TOPICAL ONLY - NEVER ingest (toxic). Topical: Generally safe when diluted. May cause contact dermatitis, irritation in 1-5% users. Allergic reactions rare. Undiluted oil causes severe irritation. Patch test recommended. If ingested: confusion, ataxia, rash (seek medical attention). Safe for external use when properly diluted.
β Contraindications
NEVER INGEST - TOXIC (causes confusion, ataxia, CNS depression). Topical only. Avoid in pregnancy/breastfeeding (insufficient safety data). Patch test before use (contact dermatitis possible). May be toxic to pets. Avoid contact with eyes, mucous membranes. Not for use in prepubertal boys (theoretical hormonal effects - gynecomastia case reports, causation uncertain).
𧬠Mechanism of Action
Terpinen-4-ol (primary component, 30-48%) and 1,8-cineole provide: (1) Broad-spectrum antimicrobial - disrupts bacterial and fungal cell membranes, (2) Anti-inflammatory via suppression of inflammatory mediators, (3) Immunomodulatory effects, (4) Wound healing promotion. Effective against Propionibacterium acnes (acne), Candida, dermatophytes.
π Dosage & Administration
TOPICAL USE ONLY. Acne: 5% tea tree oil gel applied twice daily. Fungal infections: 10% cream/solution twice daily. Dandruff: 5% shampoo 2-3 times weekly. Wounds: 10% solution. Dilution: 2-5% for general use (2-5 drops per teaspoon carrier oil). Higher concentrations (25-100%) for nail fungus. Treatment duration: 4-12 weeks for infections. NEVER USE UNDILUTED except for nail fungus.
βοΈ Note: Consult healthcare provider for appropriate dosing, especially if taking medications.
π Additional Resources
π WHO Monograph
Available in WHO Monographs on Selected Medicinal Plants
π¬ PubMed Search
π§ͺ ClinicalTrials.gov
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Data Retrieval Date: November 29, 2025
Compiled by: Sheraz Ahmed
License: CC BY-SA 4.0
Citation: Ahmed, S. (2025). Medicinal Herbs Database. Clinical Corner. https://welovelmc.com/medical-tools.htm