Last verified: 63 days ago
Tea Tree Oil
Also known as: Melaleuca alternifolia, TTO, melaleuca oil, terpinen-4-ol
Evidence under review. — Not yet rated
Antimicrobial plant oil with real evidence for skin, eye, and oral hygiene uses. Not for internal use.
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What it does
Tea tree oil is an essential oil extracted from the leaves of Melaleuca alternifolia, an Australian plant. It has genuine antimicrobial and anti-parasitic properties — clinical studies show it can...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established oral dose; topical concentrations vary by application (2-5% for eye/skin use)
What the Science Says
Tea tree oil is an essential oil extracted from the leaves of Melaleuca alternifolia, an Australian plant. It has genuine antimicrobial and anti-parasitic properties — clinical studies show it can reduce bacteria linked to bad breath, help treat eyelid inflammation (blepharitis), kill Demodex mites on eyelashes, and reduce dental bacteria when used as a rinse or irrigation solution. It is used topically or as a rinse only; it is never taken by mouth.
What It Doesn't Do
Won't cure acne on its own — evidence for acne is weak and mostly review-level. Not proven to boost your immune system internally. No evidence it works as a systemic antibiotic. Don't swallow it — tea tree oil is toxic when ingested. Not a replacement for prescription antibiotics or antifungals for serious infections.
Evidence-Based Benefits
Tea tree oil is an essential oil extracted from the leaves of Melaleuca alternifolia, an Australian plant. It has genuine antimicrobial and anti-parasitic properties — clinical studies show it can reduce bacteria linked to bad breath, help treat eyelid inflammation (blepharitis), kill Demodex mites on eyelashes, and reduce dental bacteria when used as a rinse or irrigation solution. It is used topically or as a rinse only; it is never taken by mouth.
Moderate EvidenceEffective at: No established oral dose; topical concentrations vary by application (2-5% for eye/skin use)
Source: auto-research
Absorption & Bioavailability
Unknown for systemic use; designed for topical/local application only. Skin and mucous membrane absorption occurs but systemic levels are not the therapeutic goal.
Red Flags to Watch For
- Tea tree oil is TOXIC if swallowed — even small amounts can cause serious poisoning, especially in children
- Can cause skin irritation, allergic contact dermatitis, or chemical burns if used undiluted or at high concentrations
- Eye products containing tea tree oil can cause temporary discomfort, tear film instability, and conjunctival redness — tolerability varies by formulation
- Not regulated as a drug — product concentrations and purity vary widely across the 1,000+ registered supplement products
- Avoid use near open wounds or mucous membranes without medical guidance
Products Containing Tea Tree Oil
See how Tea Tree Oil is used in these analyzed products:
Frequently Asked Questions
What does Tea Tree Oil do?
Antimicrobial plant oil with real evidence for skin, eye, and oral hygiene uses. Not for internal use.
What is the effective dose of Tea Tree Oil?
No established oral dose; topical concentrations vary by application (2-5% for eye/skin use)
Is Tea Tree Oil safe?
Tea tree oil is TOXIC if swallowed — even small amounts can cause serious poisoning, especially in children
What doesn't Tea Tree Oil do?
Won't cure acne on its own — evidence for acne is weak and mostly review-level.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-09