Ingredient review

Trans-2-Hexenyl Isovalerate

INCI: TRANS-2-HEXENYL ISOVALERATE

A synthetic fragrance ester that adds a green, fruity scent to products; generally considered safe at low concentrations but may cause sensitivity in some individuals.

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In plain English

Trans-2-Hexenyl Isovalerate is a man-made ingredient that smells like green leaves or unripe fruit. It is added to skincare and beauty products to give them a pleasant scent. Because it is a fragrance ingredient, it is used in tiny amounts and is not meant to treat or change your skin. If you have very sensitive skin or a known fragrance allergy, you may want to avoid products with this ingredient.

Review score

Safety, usefulness, and evidence

3.5Good
3.5/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

Trans-2-Hexenyl Isovalerate 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Trans-2-Hexenyl Isovalerate.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

Trans-2-Hexenyl Isovalerate is a synthetic ester formed from trans-2-hexenol (a green-leaf alcohol) and isovaleric acid. It is a colorless liquid with a strong, green, fruity odor reminiscent of unripe banana or apple peel.

How it works

In a cosmetic product, this ingredient functions solely as a fragrance component. It does not moisturize, exfoliate, or alter the skin's structure. Instead, it evaporates from the skin's surface, releasing its scent molecules into the air. The scent is detected by olfactory receptors, providing a sensory experience.

Pros

Pleasant green scent

Adds a natural-smelling, fresh green note that many people find appealing in skincare and body care products.

Low irritation potential for most

At typical use levels, it is considered a low-irritant fragrance ingredient for the general population, though patch testing is recommended for sensitive individuals.

Cons and cautions

No skincare benefit

This ingredient only provides scent; it does not hydrate, soothe, or improve skin health in any way.

Potential allergen

As a fragrance ingredient, it can cause allergic reactions or contact dermatitis in people with fragrance sensitivities, even at low concentrations.

Best for

  • People who enjoy scented beauty products and have no history of fragrance allergy
  • Those looking for a fresh, green scent in their routine

Use caution if

  • Individuals with known fragrance allergies or very sensitive skin
  • Anyone following a fragrance-free skincare regimen

Usage tips

If you have sensitive skin, patch test a product containing this ingredient on your inner arm before applying it to your face.
Look for products that list this ingredient near the end of the INCI list, indicating a low concentration.
Consider fragrance-free alternatives if you experience redness or irritation from scented products.

Safety summary

Trans-2-Hexenyl Isovalerate is considered safe for use in cosmetics at typical concentrations by major regulatory bodies. However, like all fragrance ingredients, it can cause allergic reactions in sensitive individuals. The Research Institute for Fragrance Materials (RIFM) has evaluated it and found no significant safety concerns at current usage levels.

Research notes

Safety assessments by RIFM and the International Fragrance Association (IFRA) support its use as a fragrance ingredient. Studies indicate low acute toxicity and minimal skin irritation at typical concentrations. No long-term human studies on cosmetic benefits exist because it is not an active ingredient.

Common label clues

Typical concentration
Typically used at very low levels, often below 1% in leave-on products
Regulatory status
Approved for use in cosmetics in the EU, US, and many other regions. It is subject to fragrance allergen labeling requirements in the EU if present above certain thresholds.
Common uses
Fragranced skincare, Perfumes, Body lotions, Hair care
Environmental note
As a synthetic compound, its environmental impact depends on manufacturing practices and biodegradability. Limited data is available on its persistence in the environment.

Good to know

  • Trans-2-Hexenyl Isovalerate is often used in 'green' or 'herbal' fragrance blends to evoke a natural, leafy aroma.
  • It is not a preservative, active, or functional ingredient—its only role is scent.

Common questions

What is Trans-2-Hexenyl Isovalerate in beauty products?

Trans-2-Hexenyl Isovalerate is a man-made ingredient that smells like green leaves or unripe fruit. It is added to skincare and beauty products to give them a pleasant scent. Because it is a fragrance ingredient, it is used in tiny amounts and is not meant to treat or change your skin. If you have very sensitive skin or a known fragrance allergy, you may want to avoid products with this ingredient.

What does Trans-2-Hexenyl Isovalerate do in a beauty product?

In a cosmetic product, this ingredient functions solely as a fragrance component. It does not moisturize, exfoliate, or alter the skin's structure. Instead, it evaporates from the skin's surface, releasing its scent molecules into the air. The scent is detected by olfactory receptors, providing a sensory experience.

Is Trans-2-Hexenyl Isovalerate safe for most people?

Trans-2-Hexenyl Isovalerate is considered safe for use in cosmetics at typical concentrations by major regulatory bodies. However, like all fragrance ingredients, it can cause allergic reactions in sensitive individuals. The Research Institute for Fragrance Materials (RIFM) has evaluated it and found no significant safety concerns at current usage levels.

Who should be careful with Trans-2-Hexenyl Isovalerate?

Individuals with known fragrance allergies or very sensitive skin Anyone following a fragrance-free skincare regimen

Research sources

RIFM Fragrance Ingredient Safety AssessmentOpenIFRA Standards - Trans-2-Hexenyl IsovalerateOpenPubChem Compound SummaryOpen

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.