Ingredient review
Cis-6-Nonenal
INCI: CIS-6-NON-6-ENAL
Cis-6-Nonenal is a synthetic fragrance compound that adds a fresh, watery melon note to products, but it offers no skincare benefits beyond scent.
In plain English
Cis-6-Nonenal is a man-made chemical that smells like fresh watermelon or cucumber. It is added to skincare and beauty products purely for its pleasant scent. It does not moisturize, exfoliate, or treat skin conditions. Because it is a fragrance ingredient, it may cause sensitivity in some people, especially those with very reactive skin.
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
Cis-6-Nonenal 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 Cis-6-Nonenal.
- 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
Cis-6-Nonenal is a synthetic aldehyde compound used as a fragrance ingredient. It is not derived from plants but is created in a lab to mimic the fresh, green, melon-like aroma found naturally in some fruits and vegetables.
How it works
In a cosmetic product, cis-6-nonenal contributes to the overall fragrance profile. It evaporates from the skin, releasing its scent molecules into the air. It does not interact with the skin's biology or provide any functional benefit like hydration or protection.
Pros
Pleasant scent
Provides a fresh, watery melon or cucumber note that many people find appealing in skincare and body care products.
Low typical concentration
Used at very low levels in formulations, which generally keeps the risk of irritation low for most users.
Cons and cautions
No skincare benefit
This ingredient is purely for fragrance and does not moisturize, soothe, or improve skin health in any way.
Potential allergen
As a fragrance ingredient, it can cause contact dermatitis or allergic reactions in people with sensitive skin or fragrance allergies.
Best for
- People who enjoy fresh, fruity scents in their skincare
- Those with non-sensitive skin who tolerate fragrance well
Use caution if
- Individuals with known fragrance allergies or very sensitive skin
- Those who prefer fragrance-free products to minimize irritation risk
Usage tips
Safety summary
Cis-6-nonenal is considered safe for use in cosmetics at low concentrations by fragrance safety panels, but it can be a skin sensitizer for some individuals. Those with fragrance allergies should avoid it.
Research notes
Research on cis-6-nonenal focuses on its sensory properties and safety as a fragrance ingredient. It is not studied for skincare benefits. Safety evaluations by bodies like IFRA (International Fragrance Association) support its use at low levels.
Common label clues
- Typical concentration
- Typically used at very low levels, often below 0.1%
- Regulatory status
- Approved for use as a fragrance ingredient in cosmetics in the EU and US, subject to standard safety assessments for fragrance materials.
- Common uses
- Fragranced skincare, Body care, Hair care
- Environmental note
- As a synthetic compound, its environmental impact depends on manufacturing practices and biodegradability, which are generally evaluated by fragrance safety panels.
Good to know
- Cis-6-nonenal is often used in 'fresh' or 'aquatic' fragrance blends.
- It is not a preservative or active ingredient; its only role is scent.
Common questions
What is Cis-6-Nonenal in beauty products?
Cis-6-Nonenal is a man-made chemical that smells like fresh watermelon or cucumber. It is added to skincare and beauty products purely for its pleasant scent. It does not moisturize, exfoliate, or treat skin conditions. Because it is a fragrance ingredient, it may cause sensitivity in some people, especially those with very reactive skin.
What does Cis-6-Nonenal do in a beauty product?
In a cosmetic product, cis-6-nonenal contributes to the overall fragrance profile. It evaporates from the skin, releasing its scent molecules into the air. It does not interact with the skin's biology or provide any functional benefit like hydration or protection.
Is Cis-6-Nonenal safe for most people?
Cis-6-nonenal is considered safe for use in cosmetics at low concentrations by fragrance safety panels, but it can be a skin sensitizer for some individuals. Those with fragrance allergies should avoid it.
Who should be careful with Cis-6-Nonenal?
Individuals with known fragrance allergies or very sensitive skin Those who prefer fragrance-free products to minimize irritation risk
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.