Melaleuca Alternifolia (tea tree) flower/leaf/stem extract is derived from the Australian tea tree and contains terpene compounds valued for antimicrobial, antifungal, and anti-inflammatory properties. It is commonly used in formulations targeting acne, oily skin, and minor skin irritation.
| Reported effect | How often | Notes |
|---|---|---|
| Allergic contact dermatitis | Uncommon | Sensitization risk increases with oxidized product; reactions to degradation products like ascaridole are documented. |
| Skin irritation (redness, stinging, dryness) | Common | More likely at higher concentrations or on sensitive/compromised skin. |
| Contact urticaria | Rare | Immediate hypersensitivity hives have been reported in isolated cases. |
| Systemic toxicity if ingested | Very rare | Relevant only to oral ingestion of tea tree oil, not topical cosmetic use. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.