Ingredient review

Diisopropyl Ethyl Cinnamate

INCI: DIISOPROPYL ETHYL CINNAMATE

A lightweight synthetic emollient that helps soften skin and improve product texture, but it's not a star ingredient with proven long-term benefits.

beautyskincareemollient

In plain English

Diisopropyl Ethyl Cinnamate is a man-made oil-like ingredient added to creams, lotions, and sunscreens to make them feel silky and spread easily. It sits on the skin's surface to reduce water loss and give a smooth, non-greasy feel. Think of it as a helper that makes your moisturizer or foundation glide on nicely.

Review score

Safety, usefulness, and evidence

3.5Good
3.5/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

Diisopropyl Ethyl 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Diisopropyl Ethyl 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

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

Diisopropyl Ethyl Cinnamate is a synthetic ester derived from cinnamic acid and isopropyl alcohol. It is a clear, lightweight liquid that acts as an emollient and skin conditioner in cosmetics.

How it works

It forms a thin, breathable film on the skin that helps lock in moisture and smooth the skin's surface. It also improves the spreadability and feel of products, making them less sticky or greasy.

Pros

Lightweight feel

It gives a silky, non-greasy texture that many people with oily or combination skin prefer over heavier oils.

Improves product performance

Helps sunscreens and makeup apply more evenly and feel more comfortable on the skin.

Cons and cautions

Not a powerhouse ingredient

It mainly improves texture and feel, but doesn't provide active skincare benefits like antioxidants or peptides.

Limited safety data

While generally considered safe, there is less published research on this specific ester compared to more common emollients.

Best for

  • Anyone looking for a lightweight, non-greasy moisturizer or primer
  • People with normal to oily skin who want a silky finish

Use caution if

  • Those with known allergies to synthetic esters or cinnamate derivatives

Usage tips

Look for it in the middle to end of ingredient lists — it's used at low levels for texture.
Pair with a hydrating serum underneath if your skin is dry, as it's a lightweight emollient.

Safety summary

Diisopropyl Ethyl Cinnamate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, individuals with sensitive skin or allergies to related esters should patch test first.

Research notes

There is limited peer-reviewed research specifically on this ingredient. Its safety is supported by general cosmetic ingredient safety assessments and its structural similarity to other approved esters.

Common label clues

Typical concentration
Typically 0.5–5% in leave-on products
Regulatory status
Approved for use in cosmetics in the US, EU, and many other regions. Not restricted at typical use levels.
Common uses
Moisturizers, Sunscreens, Makeup, Lip products
Environmental note
As a synthetic compound, its environmental fate is not well-studied, but it is not known to be a major concern.

Good to know

  • It is not the same as cinnamate sunscreen filters (like ethylhexyl methoxycinnamate) — it does not provide UV protection.
  • Often used in 'silky' or 'velvet' finish products.

Common questions

What is Diisopropyl Ethyl Cinnamate in beauty products?

Diisopropyl Ethyl Cinnamate is a man-made oil-like ingredient added to creams, lotions, and sunscreens to make them feel silky and spread easily. It sits on the skin's surface to reduce water loss and give a smooth, non-greasy feel. Think of it as a helper that makes your moisturizer or foundation glide on nicely.

What does Diisopropyl Ethyl Cinnamate do in a beauty product?

It forms a thin, breathable film on the skin that helps lock in moisture and smooth the skin's surface. It also improves the spreadability and feel of products, making them less sticky or greasy.

Is Diisopropyl Ethyl Cinnamate safe for most people?

Diisopropyl Ethyl Cinnamate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, individuals with sensitive skin or allergies to related esters should patch test first.

Who should be careful with Diisopropyl Ethyl Cinnamate?

Those with known allergies to synthetic esters or cinnamate derivatives

Research sources

CosIng - European Commission databaseOpenPubChem - Diisopropyl Ethyl CinnamateOpenPersonal Care Council - Ingredient SafetyOpen

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.