Ingredient review
Hexahydro-Tetramethylmethanonaphthalen-8-One
INCI: HEXAHYDRO-TETRAMETHYLMETHANONAPHTHALEN-8-ONE
A synthetic scent ingredient that adds a warm, floral note but may cause skin sensitivity in some people.
In plain English
This is a man-made chemical used to give products a pleasant smell, often described as woody or like violets. It is added in tiny amounts to perfumes, lotions, and cleansers. While generally safe, it can irritate sensitive skin or trigger allergies in some individuals.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Hexahydro-Tetramethylmethanonaphthalen-8-One can be useful, but watch for some irritation potential.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Hexahydro-Tetramethylmethanonaphthalen-8-One.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A synthetic organic compound from the ionone family, created in a lab to mimic natural floral and woody scents. It is not derived from plants but is designed to be stable and long-lasting in formulations.
How it works
It works by binding to scent receptors in the nose, creating a perception of a warm, floral, or woody aroma. In a product, it simply provides fragrance; it does not actively treat the skin or alter its function.
Pros
Pleasant scent
Adds a warm, floral, or woody aroma that many find appealing and can improve the user experience.
Stable and long-lasting
Synthetic origin means the scent remains consistent over time and does not degrade quickly like some natural fragrances.
Cons and cautions
Potential irritant
Can cause redness, itching, or stinging on sensitive skin, especially in leave-on products like lotions or serums.
Allergen risk
Listed as a common allergen by regulatory bodies; repeated exposure may lead to contact dermatitis in susceptible people.
Best for
- People who enjoy scented products and have no history of fragrance allergies
- Those looking for a stable, long-lasting scent in their cosmetics
Use caution if
- Individuals with sensitive skin or known fragrance allergies
- Anyone following a fragrance-free skincare routine
Usage tips
Safety summary
Generally recognized as safe for most people at low concentrations, but carries a moderate risk of skin irritation and allergic contact dermatitis, especially for those with fragrance sensitivities.
Research notes
Studies confirm its role as a contact allergen in some individuals, with patch test positivity rates around 0.5–1% in dermatology clinics. No evidence of carcinogenicity or systemic toxicity at cosmetic use levels.
Common label clues
- Typical concentration
- Typically less than 1% in leave-on products; higher in rinse-off products
- Regulatory status
- Approved for use in cosmetics globally, but must be listed on the label if present above 0.001% in leave-on products or 0.01% in rinse-off products in the EU, due to allergen concerns.
- Common uses
- Perfumes, Fragranced lotions, Body washes, Hair products
- Environmental note
- As a synthetic compound, it is not biodegradable and may accumulate in water systems, though concentrations in cosmetics are very low.
Good to know
- This ingredient is often listed simply as 'fragrance' or 'parfum' on labels, so it may not appear by its full chemical name.
- Regulations in the EU require this ingredient to be labeled separately if present above certain levels due to allergen potential.
Common questions
What is Hexahydro-Tetramethylmethanonaphthalen-8-One in beauty products?
This is a man-made chemical used to give products a pleasant smell, often described as woody or like violets. It is added in tiny amounts to perfumes, lotions, and cleansers. While generally safe, it can irritate sensitive skin or trigger allergies in some individuals.
What does Hexahydro-Tetramethylmethanonaphthalen-8-One do in a beauty product?
It works by binding to scent receptors in the nose, creating a perception of a warm, floral, or woody aroma. In a product, it simply provides fragrance; it does not actively treat the skin or alter its function.
Is Hexahydro-Tetramethylmethanonaphthalen-8-One safe for most people?
Generally recognized as safe for most people at low concentrations, but carries a moderate risk of skin irritation and allergic contact dermatitis, especially for those with fragrance sensitivities.
Who should be careful with Hexahydro-Tetramethylmethanonaphthalen-8-One?
Individuals with sensitive skin or known fragrance allergies Anyone following a fragrance-free skincare routine
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.