Ingredient review
Non-2-Enal
INCI: NON-2-ENAL
Non-2-Enal is a synthetic fragrance compound that adds a fresh, green note to products but offers no skincare benefits beyond scent.
In plain English
Non-2-Enal is a man-made scent ingredient that smells like fresh cucumber or cut grass. It is added to cosmetics and skincare products to give them a pleasant, natural-smelling fragrance. It does not moisturize, treat, or improve skin in any way—it is purely for smell.
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
Non-2-Enal 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 Non-2-Enal.
- 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
Non-2-Enal is an unsaturated aldehyde used as a fragrance ingredient in cosmetics. It is synthetically produced to mimic the scent of green leaves, cucumber, or fatty notes.
How it works
In a cosmetic product, Non-2-Enal works by releasing volatile molecules that interact with olfactory receptors in the nose, creating a perception of a fresh, green scent. It does not interact with skin cells or provide any functional skincare benefit.
Pros
Pleasant scent
Provides a fresh, cucumber-like fragrance that many find appealing and natural-smelling.
Low irritation risk
At typical use levels, Non-2-Enal has a low irritation risk for most skin types, though patch testing is advised for sensitive skin.
Cons and cautions
No skincare benefit
Non-2-Enal is purely a fragrance ingredient and does not hydrate, soothe, or improve skin health.
Potential allergen
As a fragrance aldehyde, it can trigger allergic contact dermatitis in some individuals, especially those with fragrance sensitivities.
Best for
- Anyone who enjoys fresh, green-scented products
- People looking for a fragrance that evokes nature
Use caution if
- Individuals with known fragrance allergies or sensitivities
Usage tips
Safety summary
Non-2-Enal is considered safe for use in cosmetics at low concentrations. However, it is a known fragrance allergen and may cause skin reactions in sensitive individuals. The EU requires it to be labeled when present above 0.01% in leave-on products and 0.001% in rinse-off products.
Research notes
Research on Non-2-Enal focuses on its role as a fragrance allergen. Studies show it can cause allergic contact dermatitis in some people, but at typical cosmetic use levels, the risk is low for the general population.
Common label clues
- Typical concentration
- Typically used at very low concentrations (under 0.1%) due to its strong odor
- Regulatory status
- Approved for use in cosmetics in the EU and US, but must be listed on the ingredient label as a fragrance allergen if present above certain concentrations (EU CosIng).
- Common uses
- Fragranced products, Perfumes, Body lotions, Cleansers
- Environmental note
- Synthetically produced, so it does not rely on natural harvesting, but its production involves chemical synthesis which has an environmental footprint.
Good to know
- Non-2-Enal is also naturally found in some foods like cucumbers and beer, contributing to their characteristic smell
- It is often used in very small amounts because its scent is potent
Common questions
What is Non-2-Enal in beauty products?
Non-2-Enal is a man-made scent ingredient that smells like fresh cucumber or cut grass. It is added to cosmetics and skincare products to give them a pleasant, natural-smelling fragrance. It does not moisturize, treat, or improve skin in any way—it is purely for smell.
What does Non-2-Enal do in a beauty product?
In a cosmetic product, Non-2-Enal works by releasing volatile molecules that interact with olfactory receptors in the nose, creating a perception of a fresh, green scent. It does not interact with skin cells or provide any functional skincare benefit.
Is Non-2-Enal safe for most people?
Non-2-Enal is considered safe for use in cosmetics at low concentrations. However, it is a known fragrance allergen and may cause skin reactions in sensitive individuals. The EU requires it to be labeled when present above 0.01% in leave-on products and 0.001% in rinse-off products.
Who should be careful with Non-2-Enal?
Individuals with known fragrance allergies or sensitivities
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.