# 1-(5,6,7,8-Tetrahydro-3,5,5,6,8,8,-hexamethyl-2-naphthyl)ethan-1-one (AHTN)

URL: https://app.greenveil.ai/ingredients/ingredient_source_ref_substance_id_87801
Categories: beauty
Identifier: annex_ref:III:182

> 1-(5,6,7,8-Tetrahydro-3,5,5,6,8,8,-hexamethyl-2-naphthyl)ethan-1-one (AHTN). Greenveil chemical-concern score: 70/100 — High concern based on regulatory listings.. Compiled from 2 published data sources.

## Safety assessment

- Chemical concern score: 70/100 — High concern based on regulatory listings.
- Confidence in this assessment: High
- Is it a concern? High concern: no hazard classifications on record. It is restricted in EU cosmetics.
- Rationale: 1-(5,6,7,8-Tetrahydro-3,5,5,6,8,8,-hexamethyl-2-naphthyl)ethan-1-one (AHTN) is restricted in cosmetic products under Annex III of the EU Cosmetics Regulation (EC) 1223/2009.

## Regulatory status

- EU: Active — Cosmetics Regulation annex III / ref 182.
- EU: restricted — Annex III of EU Cosmetics Regulation (EC) 1223/2009: substances which cosmetic products must not contain except subject to the restrictions laid down. Product types: All cosmetic products with the exception of oral products Maximum concentration: (a) leave-on products: 0.1% except:hydroalcoholic products: 1% fine fragrance: 2.5%fragrance cream: 0.5% (b) rinse-off products: 0.2%

## Expert safety opinions

- SCCS (EU Scientific Committee on Consumer Safety): no opinion on file.
- CIR (Cosmetic Ingredient Review (US expert panel)): no opinion on file.

## Data sources

- CosIng (updated 2026-09-23): https://ec.europa.eu/growth/tools-databases/cosing/details/87801
- EU CosIng Cosmetics Regulation Annexes (updated 2013-05-23): https://ec.europa.eu/growth/tools-databases/cosing/reference/annexes/list/III

_Assessed by Greenveil._