Ingredient review
Butylmethylhydrocinnamal-Methylanthranilate Schiff Base
INCI: P-TERT-BUTYL-ALPHA-METHYLHYDROCINNAMAL /METHYLANTHRANILATE SCHIFF BASE
A synthetic UV filter that helps stabilize sunscreen formulas and absorb UVA/UVB rays, but its use is limited by regulatory approval in some regions.
In plain English
This ingredient is a man-made molecule created by combining two other ingredients: a fragrance compound (butylmethylhydrocinnamal) and a UV-absorbing compound (methyl anthranilate). The resulting 'Schiff base' is a type of chemical that can absorb ultraviolet light, helping to protect your skin from sun damage. It's mainly used in sunscreens to boost the overall SPF and make the formula more stable so it doesn't break down as quickly in sunlight.
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
Butylmethylhydrocinnamal-Methylanthranilate Schiff Base 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 Butylmethylhydrocinnamal-Methylanthranilate Schiff Base.
- 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 Schiff base formed by the condensation reaction of p-tert-butyl-alpha-methylhydrocinnamal (a fragrance aldehyde) and methyl anthranilate (a UV-absorbing ester). It functions as a broad-spectrum UV filter, absorbing both UVA and UVB radiation.
How it works
The molecule absorbs UV light energy and converts it into harmless heat, preventing it from penetrating the skin and causing damage. It also helps stabilize other UV filters in the formula, extending the product's sun protection effectiveness over time.
Pros
Boosts SPF stability
Helps prevent other UV filters from breaking down in sunlight, so your sunscreen stays effective longer during wear.
Broad-spectrum protection
Absorbs both UVA and UVB rays, offering more complete sun defense compared to some single-type filters.
Cons and cautions
Limited global approval
Not approved as a standalone UV filter in the US or EU, so it's mainly found in products from other regions or as a secondary stabilizer.
Potential allergen
Derived from a fragrance ingredient, it may cause allergic reactions in people sensitive to synthetic fragrances.
Best for
- People looking for high-SPF sunscreens with stable formulas
- Those who prefer synthetic UV filters over mineral ones
Use caution if
- Individuals with known allergies to fragrance aldehydes or methyl anthranilate
- Anyone seeking a mineral-only sunscreen
Usage tips
Safety summary
Generally considered safe for topical use at typical concentrations, but limited regulatory approval restricts its use. Rare allergic reactions are possible. More research is needed on long-term safety and environmental effects.
Research notes
Studies show it effectively absorbs UV radiation and stabilizes sunscreen formulations. However, most research is from the 1990s–2000s, and modern safety assessments are sparse. It is not a primary UV filter in most markets.
Common label clues
- Typical concentration
- Up to 5% in leave-on products
- Regulatory status
- Not approved as a UV filter by the US FDA or EU CosIng. May be used in other regions under local regulations. Always check local laws.
- Common uses
- Sunscreens, Daily moisturizers with SPF, Anti-aging products with UV protection
- Environmental note
- As a synthetic compound, its environmental impact is not well-studied. Some UV filters have been linked to coral reef harm, but this specific Schiff base has limited data.
Good to know
- This ingredient is often listed under its full chemical name on labels, so look for 'P-TERT-BUTYL-ALPHA-METHYLHYDROCINNAMAL /METHYLANTHRANILATE SCHIFF BASE' in the ingredients list.
- It is more commonly used in Asian and Australian sunscreen formulations than in North American or European ones.
Common questions
What is Butylmethylhydrocinnamal-Methylanthranilate Schiff Base in beauty products?
This ingredient is a man-made molecule created by combining two other ingredients: a fragrance compound (butylmethylhydrocinnamal) and a UV-absorbing compound (methyl anthranilate). The resulting 'Schiff base' is a type of chemical that can absorb ultraviolet light, helping to protect your skin from sun damage. It's mainly used in sunscreens to boost the overall SPF and make the formula more stable so it doesn't break down as quickly in sunlight.
What does Butylmethylhydrocinnamal-Methylanthranilate Schiff Base do in a beauty product?
The molecule absorbs UV light energy and converts it into harmless heat, preventing it from penetrating the skin and causing damage. It also helps stabilize other UV filters in the formula, extending the product's sun protection effectiveness over time.
Is Butylmethylhydrocinnamal-Methylanthranilate Schiff Base safe for most people?
Generally considered safe for topical use at typical concentrations, but limited regulatory approval restricts its use. Rare allergic reactions are possible. More research is needed on long-term safety and environmental effects.
Who should be careful with Butylmethylhydrocinnamal-Methylanthranilate Schiff Base?
Individuals with known allergies to fragrance aldehydes or methyl anthranilate Anyone seeking a mineral-only sunscreen
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.