Ingredient review

Allyl Cinnamate

INCI: ALLYL CINNAMATE

Allyl Cinnamate is a synthetic fragrance ingredient that adds a sweet, balsamic scent but may cause skin irritation in sensitive individuals.

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In plain English

Allyl Cinnamate is a man-made chemical used to give cosmetics and skincare products a pleasant, sweet, cinnamon-like smell. It belongs to a group of fragrance ingredients that are generally safe at low levels, but because it can be a skin sensitizer, people with sensitive skin or fragrance allergies may want to avoid products containing it. Think of it as a perfume additive — it doesn't moisturize, protect, or treat your skin in any way.

Quick decision guide

Useful, but context matters

Allyl Cinnamate can be useful, but watch for some irritation potential.

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 Allyl Cinnamate.
  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

moderate

Can bother some users, especially with frequent use, damaged skin, or strong companion ingredients.

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

Allyl Cinnamate is a synthetic ester derived from cinnamic acid and allyl alcohol. It is not a natural plant extract but a lab-created compound used exclusively for its fragrance properties.

How it works

In a cosmetic product, Allyl Cinnamate functions solely as a fragrance ingredient. It evaporates from the skin's surface, releasing a sweet, balsamic, slightly spicy aroma. It has no known active skincare benefits like hydration, exfoliation, or antioxidant protection.

Pros

Pleasant scent

Adds a warm, sweet, balsamic fragrance that many find appealing in perfumes and body products.

Low concentration use

Typically used at very low levels (under 1%), which reduces the overall exposure and risk for most users.

Cons and cautions

Skin sensitization risk

Allyl Cinnamate is a known allergen and can cause contact dermatitis or allergic reactions in sensitive individuals, especially with repeated use.

No skincare benefit

This ingredient does not hydrate, soothe, or protect the skin — it only adds scent, so it is unnecessary in a functional skincare routine.

Best for

  • Individuals who enjoy scented products and do not have fragrance sensitivities
  • Those using products where fragrance is a desired feature

Use caution if

  • People with known fragrance allergies or sensitive, reactive skin
  • Anyone following a fragrance-free skincare routine

Usage tips

If you have sensitive skin, do a patch test on your inner arm before using a product containing Allyl Cinnamate.
Look for fragrance-free alternatives if you experience redness, itching, or stinging from scented products.
Use products with this ingredient sparingly and avoid layering multiple fragranced products.

Safety summary

Allyl Cinnamate is considered safe for use in cosmetics at low concentrations by major regulatory bodies, but it is a recognized skin sensitizer. Individuals with fragrance allergies or sensitive skin should avoid it. The overall risk to the general population is low due to typical low usage levels.

Research notes

Research confirms Allyl Cinnamate as a contact allergen in fragrance-sensitive individuals, with positive patch test reactions reported in dermatological studies. It is included in fragrance allergen lists by the EU SCCS and the International Fragrance Association (IFRA) has set usage limits to minimize sensitization risk.

Common label clues

Typical concentration
Typically used at very low levels (under 1%) in finished products
Regulatory status
Approved for use in cosmetics in the US and EU, but must be listed as a fragrance allergen on the label in the EU when present above 0.001% in leave-on products or 0.01% in rinse-off products.
Common uses
Fragranced products, Perfumes, Body lotions, Cleansers
Environmental note
As a synthetic compound, its environmental persistence and biodegradability are not well-documented, but fragrance ingredients in general can contribute to water pollution if not properly treated.

Good to know

  • Allyl Cinnamate is listed as a fragrance allergen in the EU Cosmetics Regulation and must be declared on the label if present above certain levels.
  • It is not related to cinnamon spice — the scent is similar but the chemical is synthetic.

Common questions

What is Allyl Cinnamate in beauty products?

Allyl Cinnamate is a man-made chemical used to give cosmetics and skincare products a pleasant, sweet, cinnamon-like smell. It belongs to a group of fragrance ingredients that are generally safe at low levels, but because it can be a skin sensitizer, people with sensitive skin or fragrance allergies may want to avoid products containing it. Think of it as a perfume additive — it doesn't moisturize, protect, or treat your skin in any way.

What does Allyl Cinnamate do in a beauty product?

In a cosmetic product, Allyl Cinnamate functions solely as a fragrance ingredient. It evaporates from the skin's surface, releasing a sweet, balsamic, slightly spicy aroma. It has no known active skincare benefits like hydration, exfoliation, or antioxidant protection.

Is Allyl Cinnamate safe for most people?

Allyl Cinnamate is considered safe for use in cosmetics at low concentrations by major regulatory bodies, but it is a recognized skin sensitizer. Individuals with fragrance allergies or sensitive skin should avoid it. The overall risk to the general population is low due to typical low usage levels.

Who should be careful with Allyl Cinnamate?

People with known fragrance allergies or sensitive, reactive skin Anyone following a fragrance-free skincare routine

Research sources

EU CosIng Database - Allyl CinnamateOpenIFRA Standards - Allyl CinnamateOpenPubMed - Contact allergy to fragrance ingredientsOpen

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.