Ingredient review
Benzophenone-4
INCI: BENZOPHENONE-4
Benzophenone-4 is an effective UV filter, but concerns about skin penetration and potential endocrine disruption mean it's best for occasional use in rinse-off products.
In plain English
Benzophenone-4 is a man-made chemical that absorbs ultraviolet (UV) light from the sun, especially UVA and UVB rays. It's added to sunscreens and other products to help protect your skin from sun damage. Think of it as a tiny sponge that soaks up UV energy and turns it into harmless heat. However, some studies suggest it can be absorbed through the skin and may act like a hormone in the body, which has raised safety questions. For most people, using it in a sunscreen you wash off is fine, but daily use on large areas might not be ideal.
Quick decision guide
Useful, but context matters
Benzophenone-4 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 Benzophenone-4.
- 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
Benzophenone-4 (also called sulisobenzone) is a synthetic organic compound that belongs to the benzophenone family of UV filters. It is a white to off-white powder that is water-soluble, making it easier to formulate into clear or sprayable products compared to oil-soluble filters.
How it works
Benzophenone-4 works by absorbing UV radiation (both UVA and UVB) and converting it into lower-energy heat, which is then released from the skin. This prevents the UV rays from penetrating deeper into the skin and causing damage like sunburn, premature aging, or DNA mutations. It is often combined with other UV filters to provide broad-spectrum protection.
Pros
Effective UV protection
Benzophenone-4 absorbs both UVA and UVB rays, helping prevent sunburn and long-term skin damage when used in adequate concentrations.
Water-soluble formulation
Unlike many oil-based UV filters, benzophenone-4 dissolves in water, allowing for clear, lightweight sunscreens that don't leave a white cast.
Cons and cautions
Skin absorption concerns
Studies show benzophenone-4 can penetrate the skin and enter the bloodstream, which has led to regulatory reviews and caution from health agencies.
Potential endocrine effects
Lab research indicates it may mimic estrogen, raising questions about long-term hormonal impact, though human studies are limited and inconclusive.
Best for
- People looking for a water-resistant sunscreen in a spray or gel format
- Those who tolerate chemical sunscreens well and need affordable broad-spectrum protection
Use caution if
- Individuals with sensitive or reactive skin, especially if prone to allergies
- Pregnant or nursing women who prefer to minimize chemical exposure
Usage tips
Safety summary
Benzophenone-4 is generally recognized as safe for topical use at regulated concentrations, but concerns about skin absorption and potential endocrine disruption mean it is not the first choice for daily, full-body application. Regulatory bodies continue to review its safety profile.
Research notes
Studies confirm benzophenone-4 effectively absorbs UV radiation and is stable. Human data on systemic absorption show it can enter the bloodstream, but evidence for significant health effects is limited. More research is needed on long-term exposure and endocrine activity.
Common label clues
- Typical concentration
- Up to 10% in rinse-off products, up to 5% in leave-on products (varies by region)
- Regulatory status
- Approved for use in cosmetics and sunscreens in the US (FDA) up to 10% and in the EU up to 5% (leave-on) or 6% (rinse-off). The FDA has requested additional safety data as part of ongoing sunscreen ingredient reviews.
- Common uses
- Sunscreens, Moisturizers, Lip balms, Hair care products
- Environmental note
- Benzophenone-4 has been detected in wastewater and may be harmful to aquatic life, though its environmental impact is considered lower than some other UV filters like oxybenzone.
Good to know
- Benzophenone-4 is often listed as 'Sulisobenzone' on ingredient labels.
- It is approved for use in sunscreens in the US, EU, and many other countries, but at varying maximum concentrations.
- Some environmental groups have flagged benzophenone-4 as a potential concern for coral reefs, though it is less studied than oxybenzone.
Common questions
What is Benzophenone-4 in beauty products?
Benzophenone-4 is a man-made chemical that absorbs ultraviolet (UV) light from the sun, especially UVA and UVB rays. It's added to sunscreens and other products to help protect your skin from sun damage. Think of it as a tiny sponge that soaks up UV energy and turns it into harmless heat. However, some studies suggest it can be absorbed through the skin and may act like a hormone in the body, which has raised safety questions. For most people, using it in a sunscreen you wash off is fine, but daily use on large areas might not be ideal.
What does Benzophenone-4 do in a beauty product?
Benzophenone-4 works by absorbing UV radiation (both UVA and UVB) and converting it into lower-energy heat, which is then released from the skin. This prevents the UV rays from penetrating deeper into the skin and causing damage like sunburn, premature aging, or DNA mutations. It is often combined with other UV filters to provide broad-spectrum protection.
Is Benzophenone-4 safe for most people?
Benzophenone-4 is generally recognized as safe for topical use at regulated concentrations, but concerns about skin absorption and potential endocrine disruption mean it is not the first choice for daily, full-body application. Regulatory bodies continue to review its safety profile.
Who should be careful with Benzophenone-4?
Individuals with sensitive or reactive skin, especially if prone to allergies Pregnant or nursing women who prefer to minimize chemical exposure
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.