Ingredient review
Trimethylpentadecatrien-2-one
INCI: Trimethylpentadecatrien-2-one
A synthetic fragrance ingredient that adds a warm, woody scent but offers no skincare benefits and may cause sensitivity in some people.
In plain English
This is a man-made chemical used purely to give products a pleasant smell, like a woody or amber note. It doesn't moisturize, protect, or treat your skin—it's just there for the scent experience. If you have sensitive skin or prefer fragrance-free products, you might want to avoid it.
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
Trimethylpentadecatrien-2-one 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 Trimethylpentadecatrien-2-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
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 ketone family, used as a fragrance ingredient in cosmetics and personal care products to impart a warm, woody, amber-like aroma.
How it works
It works by evaporating from the skin and interacting with olfactory receptors in the nose, creating a perception of scent. It has no known functional effect on the skin itself.
Pros
Pleasant scent
Adds 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 risk for most skin types, though patch testing is still wise.
Cons and cautions
No skincare benefit
This ingredient only provides scent—it does not hydrate, soothe, or improve skin health in any way.
Potential allergen
Like many synthetic fragrances, it can cause allergic reactions or skin sensitivity in some people, especially with repeated use.
Best for
- People who enjoy scented products and have no history of fragrance allergies
- Those looking for a warm, woody fragrance note
Use caution if
- Individuals with sensitive or reactive skin
- Anyone with a known fragrance allergy or contact dermatitis
Usage tips
Safety summary
Generally considered safe at low concentrations used in cosmetics, but it can cause skin sensitization in susceptible individuals. Regulatory bodies like IFRA monitor its use.
Research notes
Limited published research specifically on this compound, but it is structurally similar to other synthetic fragrance ketones that have been studied for skin sensitization potential. Safety is primarily assessed through industry guidelines.
Common label clues
- Typical concentration
- Very low, typically less than 1%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other countries, subject to concentration limits and safety guidelines set by IFRA.
- Common uses
- Fragranced skincare, Perfumes, Body lotions
- Environmental note
- As a synthetic compound, it is not biodegradable and may accumulate in the environment, though concentrations in rinse-off products are very low.
Good to know
- Fragrance ingredients like this one are often listed simply as 'fragrance' or 'parfum' on labels, so you may not see this specific name.
- The International Fragrance Association (IFRA) sets safety standards for its use in cosmetics.
Common questions
What is Trimethylpentadecatrien-2-one in beauty products?
This is a man-made chemical used purely to give products a pleasant smell, like a woody or amber note. It doesn't moisturize, protect, or treat your skin—it's just there for the scent experience. If you have sensitive skin or prefer fragrance-free products, you might want to avoid it.
What does Trimethylpentadecatrien-2-one do in a beauty product?
It works by evaporating from the skin and interacting with olfactory receptors in the nose, creating a perception of scent. It has no known functional effect on the skin itself.
Is Trimethylpentadecatrien-2-one safe for most people?
Generally considered safe at low concentrations used in cosmetics, but it can cause skin sensitization in susceptible individuals. Regulatory bodies like IFRA monitor its use.
Who should be careful with Trimethylpentadecatrien-2-one?
Individuals with sensitive or reactive skin Anyone with a known fragrance allergy or contact dermatitis
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.