Tea tree leaf extract is derived from Melaleuca alternifolia and contains terpenes (notably terpinen-4-ol) that provide antibacterial, antifungal, and anti-inflammatory activity. It is commonly used in formulations targeting acne, oily skin, and minor skin irritation.
| Reported effect | How often | Notes |
|---|---|---|
Allergic contact dermatitis | Uncommon | More likely with oxidized product; sensitization to oxidation byproducts like ascaridole. |
Skin irritation, redness, or burning | Common | Especially at higher concentrations or on sensitive/broken skin. |
Dryness or peeling | Uncommon | Related to its astringent and antimicrobial action. |
Photosensitivity-related reactions | Rare | Limited reports; degraded extract may increase reactivity. |
Systemic toxicity if ingested | Very rare | Relevant only to oral ingestion, not topical use. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.