Tea tree (Melaleuca alternifolia) extract is a plant-derived oil with antibacterial, antifungal, and anti-inflammatory properties, commonly used to target acne and minor skin infections. Its activity is largely attributed to terpinen-4-ol.
| Reported effect | How often | Notes |
|---|---|---|
Skin irritation (redness, stinging, dryness) | Common | More likely at higher concentrations or with undiluted oil. |
Allergic contact dermatitis | Uncommon | Risk increases with oxidized product; patch testing advised for sensitive skin. |
Contact urticaria | Rare | Hives or itching shortly after application. |
Systemic toxicity if ingested | Very rare | Topical use is generally safe; oral ingestion can cause serious effects and is not recommended. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.