OCTAHYDRO-TETRAMETHYL-METHANO-1-NAPHTHOL
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A polycyclic sesquiterpene alcohol with a methano-tetramethylnaphthalene structure, used as a woody, ambery fragrance fixative. Classified for aquatic toxicity but permitted under EU regulations.
Octahydro-Tetramethyl-Methano-1-Naphthol (patchouli alcohol or related polycyclic sesquiterpene) is a tricyclic sesquiterpene alcohol used in perfumery. The methano-bridged tetramethylnaphthalene skeleton is characteristic of ambergris-type fragrance materials. The H411 classification indicates chronic aquatic toxicity. It is listed in EU Annex III of the Cosmetics Regulation with concentration limits: 0.1% in leave-on products, 1% in hydroalcoholic products, 2.5% in fine fragrances, 0.5% in fragrance creams, and 0.2% in rinse-off products.
Skin benefits
- Provides long-lasting woody, ambery, patchouli-like fragrance
- Excellent fixative properties
- Contributes depth to fragrance compositions
Known concerns
- Aquatic toxicity with long-lasting effects (H411)
- EU Annex III restrictions with concentration limits by product type
- Limited cosmetics-specific skin safety data
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.