Ingredient review
Isobutyl Methylaminobenzoate
INCI: ISOBUTYL METHYLAMINOBENZOATE
A synthetic UVB filter that helps protect skin from sunburn, but its use is limited by regulatory approval in some regions.
In plain English
Isobutyl Methylaminobenzoate is a man-made ingredient that absorbs ultraviolet B (UVB) rays from the sun, helping to prevent sunburn. It's a type of chemical sunscreen filter that works by converting UV energy into heat, which then dissipates from the skin. You'll find it in some sunscreens and SPF products, but it's not as common as other filters like avobenzone or octinoxate because it's not approved everywhere.
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
Isobutyl Methylaminobenzoate 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 Isobutyl Methylaminobenzoate.
- 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
A synthetic organic compound belonging to the aminobenzoate family, chemically related to PABA (para-aminobenzoic acid). It is specifically designed to absorb UVB light (280–320 nm) and is used as a sunscreen active ingredient.
How it works
When applied to the skin, the molecule absorbs UVB photons and undergoes a reversible chemical change, converting the high-energy UV radiation into lower-energy heat. This prevents the UV rays from penetrating deeper into the skin and causing DNA damage or sunburn.
Pros
Effective UVB blocker
Absorbs UVB rays efficiently, reducing the risk of sunburn when used in adequate concentrations.
Good formulation compatibility
Can be combined with other UV filters to improve overall SPF performance and product texture.
Cons and cautions
Limited regulatory approval
Not permitted as a sunscreen active in major markets like the US and EU, so you'll mostly find it in products from other regions or in non-sunscreen cosmetics.
Narrow protection range
Only covers UVB rays, not UVA, so it must be paired with other filters for broad-spectrum protection.
Best for
- People looking for additional UVB protection in sunscreens
- Those who tolerate chemical sunscreens well
Use caution if
- Individuals with known sensitivity to PABA or aminobenzoate derivatives
- Those seeking broad-spectrum (UVA+UVB) protection, as this ingredient only covers UVB
Usage tips
Safety summary
Generally considered safe for topical use at typical concentrations, though it may cause mild irritation in sensitive individuals. Its safety profile is less studied than more common UV filters.
Research notes
Studies confirm its UVB absorption efficacy, but there is limited peer-reviewed research on long-term human safety or environmental effects compared to mainstream filters.
Common label clues
- Typical concentration
- Up to 5% in leave-on products, varies by regulation
- Regulatory status
- Approved as a UV filter in some countries (e.g., Japan, Australia) but not in the United States or European Union. Always check local regulations.
- Common uses
- Sunscreens, SPF moisturizers, Lip balms with SPF
- Environmental note
- Like many chemical UV filters, its environmental impact on aquatic ecosystems is not fully studied; some regions restrict certain filters to protect coral reefs.
Good to know
- This ingredient is chemically related to PABA, which was once common in sunscreens but fell out of favor due to staining and allergy concerns.
- Check product labels carefully; this ingredient may appear under its INCI name in imported cosmetics.
Common questions
What is Isobutyl Methylaminobenzoate in beauty products?
Isobutyl Methylaminobenzoate is a man-made ingredient that absorbs ultraviolet B (UVB) rays from the sun, helping to prevent sunburn. It's a type of chemical sunscreen filter that works by converting UV energy into heat, which then dissipates from the skin. You'll find it in some sunscreens and SPF products, but it's not as common as other filters like avobenzone or octinoxate because it's not approved everywhere.
What does Isobutyl Methylaminobenzoate do in a beauty product?
When applied to the skin, the molecule absorbs UVB photons and undergoes a reversible chemical change, converting the high-energy UV radiation into lower-energy heat. This prevents the UV rays from penetrating deeper into the skin and causing DNA damage or sunburn.
Is Isobutyl Methylaminobenzoate safe for most people?
Generally considered safe for topical use at typical concentrations, though it may cause mild irritation in sensitive individuals. Its safety profile is less studied than more common UV filters.
Who should be careful with Isobutyl Methylaminobenzoate?
Individuals with known sensitivity to PABA or aminobenzoate derivatives Those seeking broad-spectrum (UVA+UVB) protection, as this ingredient only covers UVB
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.