Ingredient review
Trimethyl Cyclohexenyl Butenone
INCI: TRIMETHYL-3-CYCLOHEXENYL-3-BUTEN-2-ONE
A synthetic fragrance ingredient that adds scent but offers no skincare benefits and may cause irritation in sensitive individuals.
In plain English
This is a man-made chemical added to products to give them a pleasant floral or woody smell. It doesn't help your skin in any way—it's purely for fragrance. If you have sensitive skin or allergies, you might want to avoid it because fragrance ingredients like this can sometimes cause redness, itching, or other reactions.
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
Trimethyl Cyclohexenyl Butenone 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 Trimethyl Cyclohexenyl Butenone.
- 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 ketone family, used exclusively as a fragrance ingredient in cosmetics and personal care products.
How it works
It evaporates from the skin's surface, releasing scent molecules that are detected by the nose. It has no active skincare function—its only role is to make the product smell appealing.
Pros
Pleasant scent
Adds a floral or woody fragrance that can make your skincare routine more enjoyable.
Low comedogenic risk
Unlikely to clog pores, so it's generally safe for acne-prone skin in terms of breakouts.
Cons and cautions
Potential irritant
Can cause redness, itching, or stinging in people with sensitive skin or fragrance allergies.
No skincare benefit
Provides only scent—no moisturizing, anti-aging, or protective effects for the skin.
Best for
- People who enjoy scented products and have no history of fragrance allergies
- Those with normal, non-sensitive skin
Use caution if
- Individuals with sensitive, reactive, or eczema-prone skin
- Anyone with a known fragrance allergy
Usage tips
Safety summary
Generally considered safe for most people at the low concentrations used in cosmetics, but it can be a skin irritant or allergen for sensitive individuals. The Cosmetic Ingredient Review (CIR) panel has evaluated similar fragrance ketones and found them safe when formulated to be non-irritating.
Research notes
Research on this specific compound is limited, but studies on similar fragrance ingredients show that they can cause contact dermatitis in susceptible individuals. The overall evidence supports its safety for the general population when used appropriately.
Common label clues
- Typical concentration
- Typically used at very low levels, often below 1%
- Regulatory status
- Approved for use in cosmetics in the US and EU, but subject to labeling requirements for fragrance allergens in the EU. No specific restrictions beyond general safety standards.
- Common uses
- Fragranced skincare, Perfumes, Body lotions, Cleansers
- Environmental note
- As a synthetic compound, it may persist in the environment after washing off, but its low concentration in products limits its ecological impact.
Good to know
- This ingredient is often listed simply as 'fragrance' or 'parfum' on labels, so it's hard to spot unless the full INCI is disclosed.
- Regulations in the EU require labeling of certain fragrance allergens, but this specific compound may not always be individually listed.
Common questions
What is Trimethyl Cyclohexenyl Butenone in beauty products?
This is a man-made chemical added to products to give them a pleasant floral or woody smell. It doesn't help your skin in any way—it's purely for fragrance. If you have sensitive skin or allergies, you might want to avoid it because fragrance ingredients like this can sometimes cause redness, itching, or other reactions.
What does Trimethyl Cyclohexenyl Butenone do in a beauty product?
It evaporates from the skin's surface, releasing scent molecules that are detected by the nose. It has no active skincare function—its only role is to make the product smell appealing.
Is Trimethyl Cyclohexenyl Butenone safe for most people?
Generally considered safe for most people at the low concentrations used in cosmetics, but it can be a skin irritant or allergen for sensitive individuals. The Cosmetic Ingredient Review (CIR) panel has evaluated similar fragrance ketones and found them safe when formulated to be non-irritating.
Who should be careful with Trimethyl Cyclohexenyl Butenone?
Individuals with sensitive, reactive, or eczema-prone skin Anyone with a known fragrance allergy
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.