Ingredient review
Decahydro-Tetramethylazulene-5-Methanol
INCI: DECAHYDRO-TETRAMETHYLAZULENE-5-METHANOL
A synthetic fragrance ingredient that adds a woody, amber scent but offers no skincare benefits and may be unnecessary for sensitive skin.
In plain English
This is a man-made chemical used to give skincare and beauty products a warm, woody, amber-like smell. It doesn't moisturize, treat, or improve your skin in any way—it's purely there for scent. Because it's a fragrance ingredient, it can sometimes cause irritation or allergic reactions in people with sensitive skin, though the risk is generally low at the tiny amounts used.
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
Decahydro-Tetramethylazulene-5-Methanol 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 Decahydro-Tetramethylazulene-5-Methanol.
- 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 azulene family, specifically designed to mimic the scent of natural woody or amber notes. It is produced in a lab and used as a fragrance ingredient in cosmetics.
How it works
It evaporates from the skin's surface, releasing molecules that interact with scent receptors in the nose. In a product, it simply adds a pleasant fragrance; it does not interact with skin cells or provide any functional skincare benefit.
Pros
Pleasant scent
Provides a warm, woody, amber-like fragrance that many people find appealing and long-lasting.
Low irritation risk
At typical low concentrations, it has a low irritation and comedogenic risk for most skin types.
Cons and cautions
No skincare benefit
This ingredient adds only fragrance—it does not hydrate, soothe, or treat the skin in any way.
Potential allergen
As a synthetic fragrance, it can trigger allergic reactions or irritation in people with sensitive skin or fragrance sensitivities.
Best for
- Anyone who enjoys woody, amber fragrances in their skincare
- People without fragrance sensitivities
Use caution if
- Individuals with known fragrance allergies or very sensitive skin
Usage tips
Safety summary
Generally considered safe at low concentrations used in cosmetics. However, like all fragrance ingredients, it can cause allergic contact dermatitis in susceptible individuals. The risk is low but not zero.
Research notes
Limited peer-reviewed research specific to this compound. It is accepted as a safe fragrance ingredient by industry safety panels (e.g., IFRA) based on standard toxicological assessments.
Common label clues
- Typical concentration
- Typically used at very low levels, often less than 1%
- Regulatory status
- Approved for use in cosmetics in the EU and US, subject to general fragrance allergen labeling requirements. Not restricted at typical use levels.
- Common uses
- Fragranced creams, lotions, perfumes, body washes
- Environmental note
- As a synthetic compound, its environmental persistence and biodegradability are not widely documented. Natural fragrance alternatives may have a lower environmental footprint.
Good to know
- This ingredient is not a preservative, active, or functional skincare ingredient—it's purely for scent.
- Fragrance ingredients like this are often listed near the end of an INCI list, meaning they are used in very small amounts.
Common questions
What is Decahydro-Tetramethylazulene-5-Methanol in beauty products?
This is a man-made chemical used to give skincare and beauty products a warm, woody, amber-like smell. It doesn't moisturize, treat, or improve your skin in any way—it's purely there for scent. Because it's a fragrance ingredient, it can sometimes cause irritation or allergic reactions in people with sensitive skin, though the risk is generally low at the tiny amounts used.
What does Decahydro-Tetramethylazulene-5-Methanol do in a beauty product?
It evaporates from the skin's surface, releasing molecules that interact with scent receptors in the nose. In a product, it simply adds a pleasant fragrance; it does not interact with skin cells or provide any functional skincare benefit.
Is Decahydro-Tetramethylazulene-5-Methanol safe for most people?
Generally considered safe at low concentrations used in cosmetics. However, like all fragrance ingredients, it can cause allergic contact dermatitis in susceptible individuals. The risk is low but not zero.
Who should be careful with Decahydro-Tetramethylazulene-5-Methanol?
Individuals with known fragrance allergies or very sensitive skin
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.