Ingredient review
Cyclopentadecenone
INCI: CYCLOPENTADECENONE
Cyclopentadecenone is a synthetic fragrance ingredient that adds a musky scent to products; it is generally considered safe at low concentrations but offers no skincare benefits.
In plain English
Cyclopentadecenone is a man-made chemical that smells musky and is added to many beauty products to give them a pleasant scent. It doesn't moisturize, treat, or improve your skin in any way—it's purely there for the smell. Because it's used in tiny amounts, it's unlikely to cause problems for most people, but if you have sensitive skin or a fragrance allergy, you might 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
Cyclopentadecenone 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 Cyclopentadecenone.
- 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
Cyclopentadecenone is a synthetic macrocyclic ketone, a type of organic compound with a large ring structure. It is produced in a lab and used as a fragrance ingredient to impart a warm, musky, and slightly sweet scent to cosmetic products.
How it works
In a cosmetic product, Cyclopentadecenone acts solely as a fragrance ingredient. It evaporates from the skin's surface, releasing its scent molecules into the air. It does not interact with the skin's biology or provide any functional benefit like hydration or protection.
Pros
Pleasant Scent
Adds a warm, musky fragrance that many find appealing and long-lasting, improving the user experience.
Low Irritation Risk
At typical low concentrations, it has a low irritation potential for most people, making it suitable for general use.
Cons and cautions
No Skincare Benefit
Cyclopentadecenone is purely a fragrance ingredient and offers no moisturizing, anti-aging, or other skin-improving properties.
Potential Allergen
Like many fragrance ingredients, it can cause allergic reactions or irritation in sensitive individuals, especially with repeated use.
Best for
- People who enjoy scented beauty products and do not have fragrance allergies
- Those looking for a subtle, warm musk note in their routine
Use caution if
- Individuals with known fragrance allergies or very sensitive skin
- Anyone who prefers fragrance-free skincare
Usage tips
Safety summary
Cyclopentadecenone is considered safe for use in cosmetics at low concentrations by major regulatory bodies. However, as a fragrance ingredient, it can be a contact allergen for some individuals. The overall risk is low for the general population.
Research notes
Research on Cyclopentadecenone is limited to its use as a fragrance. Studies focus on its sensitization potential, which is low at typical use levels. It is not associated with significant toxicity or irritation in standard 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 as a fragrance ingredient in cosmetics in the US and EU, subject to concentration limits and labeling requirements for allergens.
- Common uses
- Fragrances, Perfumes, Scented Lotions, Body Washes
- Environmental note
- As a synthetic compound, its environmental persistence is not well-documented, but macrocyclic musks are generally considered less bioaccumulative than some older synthetic musks.
Good to know
- Cyclopentadecenone is often listed simply as 'fragrance' or 'parfum' on labels, so you may not see it by name.
- It is not a natural ingredient; it is synthesized in a laboratory.
Common questions
What is Cyclopentadecenone in beauty products?
Cyclopentadecenone is a man-made chemical that smells musky and is added to many beauty products to give them a pleasant scent. It doesn't moisturize, treat, or improve your skin in any way—it's purely there for the smell. Because it's used in tiny amounts, it's unlikely to cause problems for most people, but if you have sensitive skin or a fragrance allergy, you might want to avoid it.
What does Cyclopentadecenone do in a beauty product?
In a cosmetic product, Cyclopentadecenone acts solely as a fragrance ingredient. It evaporates from the skin's surface, releasing its scent molecules into the air. It does not interact with the skin's biology or provide any functional benefit like hydration or protection.
Is Cyclopentadecenone safe for most people?
Cyclopentadecenone is considered safe for use in cosmetics at low concentrations by major regulatory bodies. However, as a fragrance ingredient, it can be a contact allergen for some individuals. The overall risk is low for the general population.
Who should be careful with Cyclopentadecenone?
Individuals with known fragrance allergies or very sensitive skin Anyone who prefers fragrance-free skincare
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.