Melaleuca alternifolia
Medicinal, antiseptic properties. INCI: MELALEUCA ALTERNIFOLIA LEAF OIL. 4 EU 2023/1545 regulated allergens in its typical profile.
CAS Number
68647-73-4
Extraction
Steam distillation
Origin
Australia
Regulated Allergens
4
Typical % of the oil itself — use the table below to see what this means at your usage rate.
| Allergen | CAS | Typical range | Pre-hapten |
|---|---|---|---|
| Alpha-Terpinene | 99-86-5 | 5–13% | yes |
| Terpinolene | 586-62-9 | 1–5% | yes |
| Limonene | 5989-27-5 | 0.5–4% | yes |
| Linalool | 78-70-6 | 0.1–1% | yes |
Finished-product concentration of each allergen (using the typical maximum level), leave-on threshold = 0.100%:
| Usage rate of tea tree oil | Alpha-Terpinene | Terpinolene | Limonene | Linalool |
|---|---|---|---|---|
| 0.5% | 0.065% · declare | 0.025% · declare | 0.020% · declare | 0.005% · declare |
| 1% | 0.130% · declare | 0.050% · declare | 0.040% · declare | 0.010% · declare |
| 2% | 0.260% · declare | 0.100% · declare | 0.080% · declare | 0.020% · declare |
| 5% | 0.650% · declare | 0.250% · declare | 0.200% · declare | 0.050% · declare |
Values use typical maximums — actual levels vary by producer, harvest and distillation. Your supplier's GC/MS or IFRA certificate is the source of truth.
Allergen81 auto-suggests these profiles, multiplies by your exact usage rates, groups isomers and pre-haptens, and prints the INCI label — in minutes, not spreadsheets.
Tea Tree Oil (Melaleuca alternifolia) naturally contains 4 substances regulated under EU 2023/1545: Alpha-Terpinene (typically 5–13%); Terpinolene (typically 1–5%); Limonene (typically 0.5–4%); Linalool (typically 0.1–1%). Exact values vary by harvest and producer — confirm with a GC/MS report or IFRA certificate.
The oil itself is declared under its INCI name (MELALEUCA ALTERNIFOLIA LEAF OIL). Additionally, each regulated constituent that exceeds 0.100% (leave-on) or 1.00% (rinse-off) of the finished product must be listed separately — e.g. "linalool". Because many constituents run high, even small doses of Tea Tree Oil usually trigger declarations.
It depends on the constituent with the highest typical level. For example, Alpha-Terpinene, Tea Tree Oil's most abundant regulated allergen (up to 13%), crosses the 0.001% leave-on threshold once the oil itself exceeds ~0.01% of the formula.