In our reference data, Melaleuca Alternifolia (Tea Tree) Leaf Oil can feed Malassezia (fungal acne).
Tea tree oil is an essential oil derived from the leaves of Melaleuca alternifolia, valued in skincare for its antibacterial, antifungal, and anti-inflammatory properties, commonly used to target acne and minor skin infections. Its primary active component is terpinen-4-ol.
| Reported effect | How often | Notes |
|---|---|---|
| Skin irritation (stinging, redness, dryness, burning) | Common | Especially when applied undiluted or in high concentrations; dilution reduces incidence. |
| Allergic contact dermatitis | Uncommon | Risk increases with oxidized oil; sensitization to oxidation products like ascaridole is well documented. |
| Contact urticaria | Rare | Immediate hypersensitivity reactions occasionally reported. |
| Systemic toxicity if ingested | Rare | Oral ingestion can cause ataxia and CNS depression; not for internal use. |
| Prepubertal gynecomastia (with combined lavender/tea tree products) | Very rare | Reported in case studies; possible endocrine-disrupting concern, debated in literature. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.