Ingredient review

Ethyl Diisopropylcinnamate

INCI: ETHYL DIISOPROPYLCINNAMATE

Ethyl Diisopropylcinnamate is a synthetic UV filter that helps block UVB rays, but it is less common in modern sunscreens due to limited broad-spectrum protection.

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In plain English

Ethyl Diisopropylcinnamate is a man-made ingredient that absorbs ultraviolet B (UVB) light, the type that causes sunburn. It is added to sunscreens and daily moisturizers to help protect your skin from sun damage. Because it mainly targets UVB rays, it is often paired with other filters to provide broader protection against UVA rays as well.

Review score

Safety, usefulness, and evidence

3.8Good
3.8/ 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

Ethyl Diisopropylcinnamate 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 Ethyl Diisopropylcinnamate.
  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

A synthetic ester derived from cinnamic acid, designed to absorb UVB radiation and convert it into harmless heat.

How it works

When applied to the skin, the molecule absorbs UVB photons and releases the energy as heat, preventing the radiation from penetrating deeper and causing cellular damage.

Pros

Effective UVB filter

Absorbs UVB rays efficiently, reducing the risk of sunburn when used at appropriate concentrations.

Good formulation stability

Remains stable in sunscreen blends and does not easily degrade under sunlight, helping maintain SPF over time.

Cons and cautions

Narrow spectrum

Primarily blocks UVB rays; offers little protection against UVA, which contributes to aging and long-term damage.

Potential skin sensitivity

Some individuals may experience mild irritation or allergic reactions, especially those with sensitive skin or a history of reactions to cinnamates.

Best for

  • People looking for additional UVB protection in their daily sunscreen
  • Those with normal to oily skin who prefer lightweight synthetic filters

Use caution if

  • Individuals with known sensitivity to cinnamate derivatives
  • Those seeking a purely mineral sunscreen routine

Usage tips

Use in combination with a UVA filter like avobenzone or zinc oxide for broad-spectrum protection.
Apply generously and reapply every two hours when exposed to direct sunlight for best results.

Safety summary

Generally recognized as safe for topical use at typical concentrations. Mild irritation is rare but possible. Not approved in all regions, so check local regulations.

Research notes

Studies confirm its UVB absorption capability and formulation stability. More research is needed on long-term systemic absorption and environmental impact.

Common label clues

Typical concentration
1–5% in leave-on sunscreens
Regulatory status
Approved as a UV filter in several countries including Japan and the EU, but not currently FDA-approved for use in sunscreens in the United States.
Common uses
Sunscreens, SPF moisturizers, Daily anti-aging products
Environmental note
Synthetic UV filters can accumulate in waterways; however, Ethyl Diisopropylcinnamate is not among the most commonly detected or studied in environmental monitoring.

Good to know

  • Ethyl Diisopropylcinnamate is not as widely used as newer UV filters, but it can still be found in some sunscreens and anti-aging products.
  • It is often listed alongside other sunscreen actives on the ingredient label.

Common questions

What is Ethyl Diisopropylcinnamate in beauty products?

Ethyl Diisopropylcinnamate is a man-made ingredient that absorbs ultraviolet B (UVB) light, the type that causes sunburn. It is added to sunscreens and daily moisturizers to help protect your skin from sun damage. Because it mainly targets UVB rays, it is often paired with other filters to provide broader protection against UVA rays as well.

What does Ethyl Diisopropylcinnamate do in a beauty product?

When applied to the skin, the molecule absorbs UVB photons and releases the energy as heat, preventing the radiation from penetrating deeper and causing cellular damage.

Is Ethyl Diisopropylcinnamate safe for most people?

Generally recognized as safe for topical use at typical concentrations. Mild irritation is rare but possible. Not approved in all regions, so check local regulations.

Who should be careful with Ethyl Diisopropylcinnamate?

Individuals with known sensitivity to cinnamate derivatives Those seeking a purely mineral sunscreen routine

Research sources

PubChem - Ethyl DiisopropylcinnamateOpenCosIng Database - European CommissionOpen

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.