Ingredient review
Cinoxate
INCI: Cinoxate
Cinoxate is a UVB filter that protects skin from sunburn, but it is less common today due to newer, more photostable alternatives.
In plain English
Cinoxate is a chemical sunscreen ingredient that absorbs ultraviolet B (UVB) rays from the sun, preventing them from penetrating the skin and causing sunburn or DNA damage. It works by converting UV light into heat, which then dissipates harmlessly. It is often used in combination with other sunscreens to provide broader protection.
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
Cinoxate 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 Cinoxate.
- 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
Cinoxate is a synthetic organic compound classified as a cinnamate ester. It is a UVB absorber approved for use in sunscreens in the United States and other regions.
How it works
Cinoxate absorbs UVB radiation (280–320 nm) and converts it into less harmful heat energy. It does not provide significant UVA protection, so it is typically paired with UVA filters like avobenzone or zinc oxide for broad-spectrum coverage.
Pros
Effective UVB protection
Cinoxate absorbs UVB rays efficiently, helping prevent sunburn and reducing the risk of skin cancer when used as directed.
Lightweight feel
As a chemical sunscreen, it blends easily into the skin without leaving a white cast, making it suitable for daily wear under makeup.
Cons and cautions
Limited photostability
Cinoxate can break down when exposed to sunlight, potentially reducing its protective power over time. It is often formulated with stabilizers or other filters to compensate.
Narrow spectrum
It only blocks UVB rays, so it must be combined with UVA filters for broad-spectrum protection. On its own, it leaves skin vulnerable to UVA damage.
Best for
- People looking for a UVB filter in a sunscreen or daily SPF product
- Those who tolerate chemical sunscreens well and want lightweight protection
Use caution if
- Individuals with sensitive or reactive skin who may prefer mineral sunscreens like zinc oxide or titanium dioxide
Usage tips
Safety summary
Cinoxate is considered safe for topical use in sunscreens at approved concentrations. It has a low irritation and allergy risk, but like all chemical sunscreens, it may cause sensitivity in some individuals. Its environmental impact is less studied than that of oxybenzone or octinoxate.
Research notes
Research on cinoxate is limited compared to more common UV filters. It has been shown to effectively absorb UVB radiation, but its photostability is lower than newer alternatives. No major safety concerns have been identified in human studies at regulated levels.
Common label clues
- Typical concentration
- Up to 3% in the US (OTC sunscreen monograph)
- Regulatory status
- Approved as an OTC sunscreen active ingredient in the US at concentrations up to 3%. In the EU, it is not listed in Annex VI (approved UV filters), so it is rarely used in European sunscreens.
- Common uses
- Sunscreens, Moisturizers with SPF, Lip balms
- Environmental note
- Like many chemical UV filters, cinoxate may have potential environmental impacts, including coral reef toxicity, though data specific to cinoxate is limited. Some regions have restricted certain sunscreens to protect marine ecosystems.
Good to know
- Cinoxate is approved by the FDA as a safe and effective sunscreen ingredient in the US, but it is less commonly used in modern formulations due to the availability of more photostable UV filters.
- It is often listed on labels as 'Cinoxate' and may appear alongside other active ingredients like avobenzone or oxybenzone.
Common questions
What is Cinoxate in beauty products?
Cinoxate is a chemical sunscreen ingredient that absorbs ultraviolet B (UVB) rays from the sun, preventing them from penetrating the skin and causing sunburn or DNA damage. It works by converting UV light into heat, which then dissipates harmlessly. It is often used in combination with other sunscreens to provide broader protection.
What does Cinoxate do in a beauty product?
Cinoxate absorbs UVB radiation (280–320 nm) and converts it into less harmful heat energy. It does not provide significant UVA protection, so it is typically paired with UVA filters like avobenzone or zinc oxide for broad-spectrum coverage.
Is Cinoxate safe for most people?
Cinoxate is considered safe for topical use in sunscreens at approved concentrations. It has a low irritation and allergy risk, but like all chemical sunscreens, it may cause sensitivity in some individuals. Its environmental impact is less studied than that of oxybenzone or octinoxate.
Who should be careful with Cinoxate?
Individuals with sensitive or reactive skin who may prefer mineral sunscreens like zinc oxide or titanium dioxide
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.