Ingredient review
Gamma-Undecalactone
INCI: GAMMA-UNDECALACTONE
A synthetic peach-scented fragrance ingredient that adds a pleasant aroma but offers no skincare benefits and may cause sensitivity in some individuals.
In plain English
Gamma-Undecalactone is a man-made chemical that smells like ripe peaches. It is added to skincare and beauty products to give them a sweet, fruity scent. While it makes products smell nice, it does not improve your skin's health or appearance. Some people with very sensitive skin may find it irritating, but for most it is safe at the low levels used in cosmetics.
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
Gamma-Undecalactone 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 Gamma-Undecalactone.
- 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
Gamma-Undecalactone is a lactone compound produced synthetically for use as a fragrance ingredient. It is a clear to pale yellow liquid with a strong peach-like odor and is one of the most common 'peach' notes in perfumery and scented cosmetics.
How it works
In a cosmetic product, Gamma-Undecalactone acts solely as a fragrance agent. It evaporates from the skin after application, releasing its sweet scent. It does not moisturize, exfoliate, or otherwise alter the skin's structure or function.
Pros
Pleasant scent
Adds a sweet, natural-smelling peach aroma that many people find enjoyable and uplifting in their daily routine.
Low irritation for most
At typical cosmetic concentrations, it rarely causes problems for the general population, making it a widely used fragrance option.
Cons and cautions
No skin benefit
Gamma-Undecalactone is purely a fragrance ingredient—it does not hydrate, soothe, or improve skin health in any way.
Potential allergen
Like many synthetic fragrances, it can cause contact dermatitis or allergic reactions in sensitive individuals, especially with repeated use.
Best for
- People who enjoy fruity-scented skincare
- Those without fragrance sensitivities
Use caution if
- Individuals with known fragrance allergies or sensitive, reactive skin
Usage tips
Safety summary
Gamma-Undecalactone is considered safe for use in cosmetics at typical low concentrations. It is not a known carcinogen or reproductive toxin. However, like many fragrance ingredients, it can act as a skin sensitizer in a small subset of the population. Regulatory bodies and industry groups set usage limits to minimize risk.
Research notes
Research on Gamma-Undecalactone focuses primarily on its fragrance properties and safety profile. It has been evaluated by the Research Institute for Fragrance Materials (RIFM) and is included in IFRA's standards. Studies indicate low acute toxicity and low skin irritation at typical use levels, though sensitization potential exists.
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, with concentration limits recommended by the International Fragrance Association (IFRA).
- Common uses
- Fragranced moisturizers, Body lotions, Cleansers, Perfumes
- Environmental note
- As a synthetic compound, it is produced through chemical synthesis rather than natural extraction, which reduces pressure on natural resources but may have a moderate environmental footprint from manufacturing.
Good to know
- Gamma-Undecalactone is sometimes misleadingly called 'Aldehyde C-14' even though it is not an aldehyde—it's a lactone.
- It is one of the most widely used peach-scented ingredients in cosmetics and perfumery.
Common questions
What is Gamma-Undecalactone in beauty products?
Gamma-Undecalactone is a man-made chemical that smells like ripe peaches. It is added to skincare and beauty products to give them a sweet, fruity scent. While it makes products smell nice, it does not improve your skin's health or appearance. Some people with very sensitive skin may find it irritating, but for most it is safe at the low levels used in cosmetics.
What does Gamma-Undecalactone do in a beauty product?
In a cosmetic product, Gamma-Undecalactone acts solely as a fragrance agent. It evaporates from the skin after application, releasing its sweet scent. It does not moisturize, exfoliate, or otherwise alter the skin's structure or function.
Is Gamma-Undecalactone safe for most people?
Gamma-Undecalactone is considered safe for use in cosmetics at typical low concentrations. It is not a known carcinogen or reproductive toxin. However, like many fragrance ingredients, it can act as a skin sensitizer in a small subset of the population. Regulatory bodies and industry groups set usage limits to minimize risk.
Who should be careful with Gamma-Undecalactone?
Individuals with known fragrance allergies or sensitive, 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.