Ingredient review
Vinyl Cyclohexene Carboxaldehyde
INCI: VINYL CYCLOHEXENE CARBOXALDEHYDE
A synthetic floral fragrance that is a common allergen; many brands have phased it out due to safety concerns.
In plain English
Vinyl cyclohexene carboxaldehyde is a man-made chemical that smells like lily of the valley. It is added to many beauty products for its pleasant floral scent. However, it is also a well-known skin allergen, meaning it can cause allergic reactions in some people. Because of this, many companies have stopped using it in their formulas.
Review score
Safety, usefulness, and evidence
Higher-caution ingredient
The evidence base is relatively strong for its common cosmetic role.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- strong
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Read the cautions before using
Vinyl Cyclohexene Carboxaldehyde 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 Vinyl Cyclohexene Carboxaldehyde.
- 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
strongThere is a stronger practical or research basis for the ingredient role described here.
What it is
A synthetic aromatic aldehyde used as a fragrance ingredient. It was once widely used in perfumery for its fresh, floral scent reminiscent of lily of the valley.
How it works
It works by binding to olfactory receptors in the nose, creating the perception of a floral scent. In a cosmetic product, it simply adds fragrance; it does not provide any skincare benefit.
Pros
Pleasant floral scent
Adds a classic lily-of-the-valley fragrance that many people enjoy in perfumes and scented body products.
Widely studied
Its allergenic properties are well-documented, making it easier for consumers to identify and avoid if needed.
Cons and cautions
Common allergen
Frequently causes allergic contact dermatitis, especially in leave-on products like lotions and perfumes.
Increasingly restricted
Due to safety concerns, it has been banned or restricted in some regions, and many brands have voluntarily removed it.
Best for
- People who are not sensitive to fragrance allergens
- Those using products from brands that have reformulated to exclude this ingredient
Use caution if
- Anyone with a known allergy to fragrance or a history of contact dermatitis
- People with sensitive or reactive skin
Usage tips
Safety summary
Vinyl cyclohexene carboxaldehyde is a known skin sensitizer and allergen. It is considered safe for use at low concentrations by some regulatory bodies, but its potential to cause allergic reactions means it is best avoided by those with sensitive skin or fragrance allergies.
Research notes
Multiple studies and clinical reports confirm that this ingredient is a common cause of allergic contact dermatitis. The EU's Scientific Committee on Consumer Safety (SCCS) has set limits on its use due to sensitization concerns.
Common label clues
- Typical concentration
- Typically used at very low levels, often below 0.1% in leave-on products
- Regulatory status
- Restricted in the EU under the Cosmetics Regulation (Annex III) due to its allergenic potential; must be labeled if above certain concentrations.
- Common uses
- Fragranced lotions, Perfumes, Body washes, Hair products
- Environmental note
- As a synthetic compound, it may persist in the environment, but its impact is not as well-studied as some other fragrance ingredients.
Good to know
- This ingredient is also known as Lyral and is listed on the EU's list of 26 known fragrance allergens that must be labeled separately.
- Many 'hypoallergenic' or 'fragrance-free' products will not contain this ingredient.
Common questions
What is Vinyl Cyclohexene Carboxaldehyde in beauty products?
Vinyl cyclohexene carboxaldehyde is a man-made chemical that smells like lily of the valley. It is added to many beauty products for its pleasant floral scent. However, it is also a well-known skin allergen, meaning it can cause allergic reactions in some people. Because of this, many companies have stopped using it in their formulas.
What does Vinyl Cyclohexene Carboxaldehyde do in a beauty product?
It works by binding to olfactory receptors in the nose, creating the perception of a floral scent. In a cosmetic product, it simply adds fragrance; it does not provide any skincare benefit.
Is Vinyl Cyclohexene Carboxaldehyde safe for most people?
Vinyl cyclohexene carboxaldehyde is a known skin sensitizer and allergen. It is considered safe for use at low concentrations by some regulatory bodies, but its potential to cause allergic reactions means it is best avoided by those with sensitive skin or fragrance allergies.
Who should be careful with Vinyl Cyclohexene Carboxaldehyde?
Anyone with a known allergy to fragrance or a history of contact dermatitis People with sensitive or reactive 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.