Ingredient review
Butyl Cinnamate
INCI: Butyl Cinnamate
Butyl Cinnamate is a synthetic fragrance ingredient with mild UV-absorbing ability, generally considered safe in low concentrations but best avoided by those with fragrance sensitivities.
In plain English
Butyl Cinnamate is a man-made ingredient that smells faintly sweet and balsamic, like cinnamon or vanilla. It's added to skincare products mainly for its pleasant scent, but it also has a very mild ability to absorb some UV light. Think of it as a fragrance helper that might offer a tiny bit of sun protection, though not enough to replace your sunscreen. It's generally safe for most people, but if your skin reacts to fragrances, you may want to skip products containing 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
Butyl Cinnamate 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 Butyl Cinnamate.
- 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
Butyl Cinnamate is a synthetic ester derived from cinnamic acid and butanol. It belongs to a family of compounds known as cinnamates, which are often used in perfumery and as UV filters in sunscreens. In cosmetics, it appears as a clear, colorless to pale yellow liquid with a mild, pleasant odor.
How it works
In a cosmetic product, Butyl Cinnamate primarily functions as a fragrance ingredient, imparting a warm, balsamic scent. Additionally, its chemical structure allows it to absorb a small amount of UVB radiation, providing a very low level of sun protection. However, this UV-absorbing capacity is weak compared to dedicated sunscreen filters, so it is not relied upon for meaningful sun protection.
Pros
Pleasant scent
Adds a warm, balsamic fragrance that many find appealing, enhancing the sensory experience of your skincare routine.
Low irritation potential
Generally well-tolerated by most skin types, with a low risk of causing redness or stinging when used at typical concentrations.
Cons and cautions
Fragrance allergen risk
As a fragrance ingredient, it can trigger allergic reactions in people with sensitive skin or fragrance allergies, leading to contact dermatitis.
Weak UV protection
Its UV-absorbing ability is minimal and not sufficient to provide meaningful sun protection, so it should not be relied upon as a sunscreen ingredient.
Best for
- People who enjoy lightly scented skincare products
- Those without known fragrance allergies
Use caution if
- Individuals with fragrance allergies or sensitive skin that reacts to scented products
Usage tips
Safety summary
Butyl Cinnamate is considered safe for use in cosmetics at typical concentrations. The main concern is its potential as a fragrance allergen, which can cause skin reactions in sensitive individuals. Regulatory bodies like the IFRA and EU CosIng have set usage limits to minimize risk. Overall, it is a low-risk ingredient for the general population.
Research notes
Research on Butyl Cinnamate is limited. Most safety data comes from its use as a fragrance ingredient, with studies indicating low acute toxicity and skin irritation. Its UV-absorbing properties are documented but not considered significant for sun protection. No long-term human studies on topical application are available.
Common label clues
- Typical concentration
- Typically used at 0.1% to 2% in leave-on products
- Regulatory status
- Butyl Cinnamate is approved for use in cosmetics in the EU, US, and many other regions, typically as a fragrance ingredient. It is subject to fragrance allergen labeling requirements in the EU if present above certain thresholds.
- Common uses
- Fragranced creams, Sunscreens, Lip balms, Body lotions
- Environmental note
- As a synthetic compound, Butyl Cinnamate is not biodegradable and may accumulate in the environment. Its use in rinse-off products can contribute to aquatic exposure, though its environmental impact is not well-studied.
Good to know
- Butyl Cinnamate is often listed under 'fragrance' on ingredient labels, so it may not appear by name.
- It is chemically related to cinnamates found in cinnamon and balsam of Peru, which are known allergens for some people.
Common questions
What is Butyl Cinnamate in beauty products?
Butyl Cinnamate is a man-made ingredient that smells faintly sweet and balsamic, like cinnamon or vanilla. It's added to skincare products mainly for its pleasant scent, but it also has a very mild ability to absorb some UV light. Think of it as a fragrance helper that might offer a tiny bit of sun protection, though not enough to replace your sunscreen. It's generally safe for most people, but if your skin reacts to fragrances, you may want to skip products containing it.
What does Butyl Cinnamate do in a beauty product?
In a cosmetic product, Butyl Cinnamate primarily functions as a fragrance ingredient, imparting a warm, balsamic scent. Additionally, its chemical structure allows it to absorb a small amount of UVB radiation, providing a very low level of sun protection. However, this UV-absorbing capacity is weak compared to dedicated sunscreen filters, so it is not relied upon for meaningful sun protection.
Is Butyl Cinnamate safe for most people?
Butyl Cinnamate is considered safe for use in cosmetics at typical concentrations. The main concern is its potential as a fragrance allergen, which can cause skin reactions in sensitive individuals. Regulatory bodies like the IFRA and EU CosIng have set usage limits to minimize risk. Overall, it is a low-risk ingredient for the general population.
Who should be careful with Butyl Cinnamate?
Individuals with fragrance allergies or sensitive skin that reacts to scented 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.