Ingredient review
Cis-3-Hexenyl Isobutyrate
INCI: CIS-3-HEXENYL ISOBUTYRATE
A synthetic fragrance ingredient that adds a fresh green scent; generally safe at low levels but may cause sensitivity in some individuals.
In plain English
Cis-3-Hexenyl Isobutyrate is a man-made chemical that smells like freshly cut grass or green leaves. It is added to skincare and beauty products to give them a pleasant, natural-smelling fragrance. Because it is a fragrance ingredient, it is used in very tiny amounts and is considered safe for most people, though those with very sensitive skin or fragrance allergies may 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
Cis-3-Hexenyl Isobutyrate 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-3-Hexenyl Isobutyrate.
- 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 ester derived from the reaction of cis-3-hexenol (a natural green leaf alcohol) with isobutyric acid. It is a colorless liquid with a strong, fresh green odor.
How it works
It functions solely as a fragrance ingredient, contributing to the overall scent profile of a product. It does not provide any skincare benefits like moisturizing or anti-aging.
Pros
Pleasant green scent
Adds a natural, fresh grassy note that many find appealing and uplifting.
Low irritation potential
At typical use levels, it is considered safe and unlikely to cause irritation for most people.
Cons and cautions
No skincare benefit
This ingredient is purely for fragrance and does not hydrate, protect, or improve skin health.
Potential allergen
As a fragrance ingredient, it can trigger allergic reactions or irritation in sensitive individuals, especially with repeated use.
Best for
- People who enjoy fresh, green-scented products
- Those without fragrance sensitivities
Use caution if
- Individuals with known fragrance allergies or very sensitive skin
Usage tips
Safety summary
Cis-3-Hexenyl Isobutyrate is considered safe for use in cosmetics at low concentrations. It is not a common irritant, but like all fragrance ingredients, it can cause allergic reactions in susceptible individuals. Regulatory bodies and industry safety panels have reviewed it and found no significant health concerns at typical exposure levels.
Research notes
Research on this specific ester is limited, but it is part of a well-studied class of fragrance ingredients. Safety assessments by the Research Institute for Fragrance Materials (RIFM) and IFRA support its safe use in cosmetics. No peer-reviewed studies were found linking it to serious health risks.
Common label clues
- Typical concentration
- Typically used at very low levels (under 1%) in finished products
- Regulatory status
- Approved for use in cosmetics by the International Fragrance Association (IFRA) and generally recognized as safe by the U.S. Food and Drug Administration (FDA) when used as intended.
- Common uses
- Fragranced skincare, Perfumes, Body lotions, Cleansers
- Environmental note
- As a synthetic compound, its environmental impact is minimal compared to natural extracts that require harvesting, but it is not biodegradable in all conditions.
Good to know
- Cis-3-Hexenyl Isobutyrate is often listed simply as 'fragrance' or 'parfum' on labels, so it may not appear by name.
- It is a synthetic version of a compound found naturally in green leaves and some fruits.
Common questions
What is Cis-3-Hexenyl Isobutyrate in beauty products?
Cis-3-Hexenyl Isobutyrate is a man-made chemical that smells like freshly cut grass or green leaves. It is added to skincare and beauty products to give them a pleasant, natural-smelling fragrance. Because it is a fragrance ingredient, it is used in very tiny amounts and is considered safe for most people, though those with very sensitive skin or fragrance allergies may want to avoid it.
What does Cis-3-Hexenyl Isobutyrate do in a beauty product?
It functions solely as a fragrance ingredient, contributing to the overall scent profile of a product. It does not provide any skincare benefits like moisturizing or anti-aging.
Is Cis-3-Hexenyl Isobutyrate safe for most people?
Cis-3-Hexenyl Isobutyrate is considered safe for use in cosmetics at low concentrations. It is not a common irritant, but like all fragrance ingredients, it can cause allergic reactions in susceptible individuals. Regulatory bodies and industry safety panels have reviewed it and found no significant health concerns at typical exposure levels.
Who should be careful with Cis-3-Hexenyl Isobutyrate?
Individuals with known fragrance allergies or very sensitive 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.