Ingredient review
Hexahydro Tetramethyl Methanonaphthalene
INCI: HEXAHYDRO-TETRAMETHYL-METHANONAPHTHALENE
A synthetic fragrance ingredient that provides a warm, woody scent; generally considered safe at low concentrations but may cause sensitivity in some individuals.
In plain English
This is a man-made chemical added to skincare and beauty products to give them a pleasant, warm, woody, or amber-like smell. It doesn't do anything for your skin's health—it's purely for fragrance. Because it's a fragrance ingredient, it can sometimes cause irritation or allergic reactions, especially if you have sensitive skin or a known fragrance allergy.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Hexahydro Tetramethyl Methanonaphthalene is generally a lower-concern ingredient when the full formula suits your skin.
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 Tetramethyl Methanonaphthalene.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
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 polycyclic musk family, specifically a naphthopyran derivative, used exclusively as a fragrance ingredient in cosmetics.
How it works
It evaporates from the skin's surface, releasing aromatic molecules that interact with olfactory receptors in the nose, creating the perception of a woody, amber scent. It has no active skincare function.
Pros
Pleasant scent
Adds a warm, woody, amber-like fragrance that many find appealing and long-lasting on the skin.
Low irritation risk for most
At typical low concentrations, it rarely causes irritation in people without fragrance sensitivities.
Cons and cautions
No skincare benefit
This ingredient is purely for fragrance and does not moisturize, protect, or improve skin health in any way.
Potential allergen
As a synthetic fragrance, it can trigger allergic contact dermatitis in sensitive individuals, especially with repeated use.
Best for
- People who enjoy woody, amber fragrances in their skincare
- Those without known fragrance sensitivities
Use caution if
- Individuals with sensitive skin or a history of fragrance allergies
- Anyone following a fragrance-free skincare routine
Usage tips
Safety summary
Generally recognized as safe for most people at low concentrations used in cosmetics. However, it is a known potential allergen and should be avoided by those with fragrance sensitivities.
Research notes
Research indicates low acute toxicity and skin irritation at typical use levels, but it is a recognized contact allergen in patch test studies. The International Fragrance Association (IFRA) sets usage limits to minimize sensitization risk.
Common label clues
- Typical concentration
- Typically used at very low levels, often below 1% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions, subject to concentration limits and labeling requirements for allergens.
- Common uses
- Perfumes, Body lotions, Facial moisturizers, Cleansers
- Environmental note
- As a synthetic compound, it may persist in the environment and has been detected in water samples, though its ecological impact is still being studied.
Good to know
- This ingredient is often listed near the end of an INCI list because it is used in very small amounts.
- Fragrance ingredients are not required to be individually listed on labels in many regions, but this one is named specifically.
Common questions
What is Hexahydro Tetramethyl Methanonaphthalene in beauty products?
This is a man-made chemical added to skincare and beauty products to give them a pleasant, warm, woody, or amber-like smell. It doesn't do anything for your skin's health—it's purely for fragrance. Because it's a fragrance ingredient, it can sometimes cause irritation or allergic reactions, especially if you have sensitive skin or a known fragrance allergy.
What does Hexahydro Tetramethyl Methanonaphthalene do in a beauty product?
It evaporates from the skin's surface, releasing aromatic molecules that interact with olfactory receptors in the nose, creating the perception of a woody, amber scent. It has no active skincare function.
Is Hexahydro Tetramethyl Methanonaphthalene safe for most people?
Generally recognized as safe for most people at low concentrations used in cosmetics. However, it is a known potential allergen and should be avoided by those with fragrance sensitivities.
Who should be careful with Hexahydro Tetramethyl Methanonaphthalene?
Individuals with sensitive skin or a history of 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.