Ingredient review
Cyclopentadecanone
INCI: CYCLOPENTADECANONE
Cyclopentadecanone is a synthetic musk fragrance ingredient that adds a pleasant scent to products but offers no direct skincare benefits.
In plain English
Cyclopentadecanone is a man-made ingredient that smells musky and is used to give perfumes, lotions, and other beauty products a pleasant scent. It doesn't moisturize, treat skin conditions, or provide any active skincare benefit—it's purely there for fragrance. Because it's synthetic, it's consistent and stable, but some people may prefer fragrance-free products if they have sensitive 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
Cyclopentadecanone 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 Cyclopentadecanone.
- 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
Cyclopentadecanone is a macrocyclic ketone, a type of synthetic musk compound. It is produced in a lab to mimic natural musk scents, offering a clean, long-lasting fragrance without the need for animal-derived musk.
How it works
In a cosmetic product, cyclopentadecanone acts as a fragrance ingredient. It evaporates slowly from the skin, releasing a musky scent that can last for hours. It does not interact with the skin's biology or provide any functional benefit beyond scent.
Pros
Pleasant musky scent
Provides a clean, long-lasting musky fragrance that many find appealing in perfumes and scented skincare.
Synthetic and ethical
Made in a lab, so it avoids the ethical and sustainability issues of harvesting natural musk from animals.
Cons and cautions
No skincare benefit
This ingredient only adds scent—it doesn't moisturize, protect, or treat the skin in any way.
Potential irritant for some
While generally low-risk, fragrance ingredients can still cause irritation or allergic reactions in people with sensitive skin or fragrance allergies.
Best for
- People who enjoy scented skincare and perfumes
- Those looking for a synthetic, animal-free musk fragrance
Use caution if
- Individuals with fragrance allergies or very sensitive skin who prefer fragrance-free products
Usage tips
Safety summary
Cyclopentadecanone is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, but as with any fragrance ingredient, individuals with known fragrance allergies should exercise caution.
Research notes
Research on cyclopentadecanone is limited but supports its safety as a fragrance ingredient. It is not associated with significant toxicity or endocrine disruption at cosmetic use levels, according to industry safety assessments.
Common label clues
- Typical concentration
- Typically used at very low concentrations, often below 1% in leave-on products.
- Regulatory status
- Approved for use in cosmetics in the EU and US, subject to general fragrance ingredient regulations. The International Fragrance Association (IFRA) sets usage limits to ensure safety.
- Common uses
- Fragrances, Perfumes, Scented skincare products
- Environmental note
- Macrocyclic musks like cyclopentadecanone are generally considered more environmentally friendly than older synthetic musks because they break down more easily in the environment.
Good to know
- Cyclopentadecanone is considered a 'macrocyclic musk,' which is a class of synthetic musks known for being more biodegradable than older polycyclic musks.
- It is often used in combination with other fragrance ingredients to create complex scent profiles.
Common questions
What is Cyclopentadecanone in beauty products?
Cyclopentadecanone is a man-made ingredient that smells musky and is used to give perfumes, lotions, and other beauty products a pleasant scent. It doesn't moisturize, treat skin conditions, or provide any active skincare benefit—it's purely there for fragrance. Because it's synthetic, it's consistent and stable, but some people may prefer fragrance-free products if they have sensitive skin.
What does Cyclopentadecanone do in a beauty product?
In a cosmetic product, cyclopentadecanone acts as a fragrance ingredient. It evaporates slowly from the skin, releasing a musky scent that can last for hours. It does not interact with the skin's biology or provide any functional benefit beyond scent.
Is Cyclopentadecanone safe for most people?
Cyclopentadecanone is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, but as with any fragrance ingredient, individuals with known fragrance allergies should exercise caution.
Who should be careful with Cyclopentadecanone?
Individuals with fragrance allergies or very sensitive skin who prefer fragrance-free products
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.