All allergens

Terpinolene

Fresh pine-like, oxidizes — regulated under EU Regulation 2023/1545 (expansion of declarable fragrance allergens from 26 to 81+).

Pre-hapten: oxidizes on air exposure to Terpinolene hydroperoxides — stronger sensitizers. Store cool, dark, and use antioxidants where appropriate.

CAS Number

586-62-9

EC Number

209-578-0

INCI Name

TERPINOLENE

Status

Declarable

Declaration thresholds (EU 2023/1545)

Leave-on products

0.100%

= 10 mg/kg (10 ppm)

Rinse-off products

1.00%

= 100 mg/kg (100 ppm)

Terpinolene must be separately declared in the ingredient list (INCI) when its concentration in the finished product exceeds these values. Below the threshold, no separate mention is required.

Essential oils containing Terpinolene

Typical concentration ranges (of the oil itself, not the finished product):

Tea Tree Oil1–5%

Example: at 1.5% lavender oil in a leave-on cream with linalool at up to 45%, the product contains up to ~0.68% linalool — far above the 0.001% threshold, so it must be declared.

Check your formula against Terpinolene automatically

Upload your supplier PDFs and Allergen81 extracts every allergen, runs the threshold math (including pre-hapten grouping), and generates your INCI-compliant label.

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Terpinolene — FAQ

When does Terpinolene need to be declared on a cosmetic label?

Under EU Regulation 2023/1545, Terpinolene must be listed separately in the ingredient declaration (INCI) when its concentration in the finished product exceeds 0.100% in leave-on products or 1.00% in rinse-off products.

Which essential oils contain Terpinolene?

Terpinolene naturally occurs in: Tea Tree Oil. Typical concentration ranges in these oils vary — always confirm with a supplier IFRA certificate or GC/MS report.

Does Terpinolene oxidize?

Yes. Terpinolene is a pre-hapten: on air exposure it oxidizes to Terpinolene hydroperoxides, which are stronger sensitizers. Fresh product and antioxidant-stabilized formulations reduce this risk.