Ingredient review

Oxobenzoxazinyl Naphthalene Sulfoanilide

INCI: Oxobenzoxazinyl Naphthalene Sulfoanilide

A synthetic UV filter that helps protect your skin from sun damage, but it's not a primary active in most products.

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In plain English

This is a man-made ingredient that absorbs ultraviolet (UV) light, especially UVA rays, to help prevent them from damaging your skin. It's often used in sunscreens and other products to keep the formula stable and effective under sunlight.

Review score

Safety, usefulness, and evidence

3.5Good
3.5/ 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

Oxobenzoxazinyl Naphthalene Sulfoanilide 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 Oxobenzoxazinyl Naphthalene Sulfoanilide.
  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 organic compound designed to absorb UV radiation and convert it into heat, preventing it from penetrating the skin.

How it works

It works by absorbing UV light and releasing the energy as heat, which stops the UV rays from reaching deeper layers of your skin and causing damage like sunburn or premature aging.

Pros

Effective UV absorber

Helps protect skin from UVA rays, which are linked to aging and long-term damage.

Formula stabilizer

Can improve the shelf life and performance of other sunscreen ingredients in the product.

Cons and cautions

Limited research

Compared to common UV filters like avobenzone, there is less published safety and efficacy data for this ingredient.

Not a primary active

It's usually used in small amounts as a stabilizer, so it may not be the main source of sun protection.

Best for

  • People looking for broad-spectrum sun protection
  • Those with sensitive skin who tolerate synthetic filters well

Use caution if

  • Individuals with known allergies to synthetic UV filters
  • Those preferring mineral-only sunscreens

Usage tips

Always use a broad-spectrum sunscreen with SPF 30 or higher for adequate protection.
Apply sunscreen generously and reapply every two hours when outdoors.

Safety summary

Generally considered safe at low concentrations in cosmetics, but long-term skin absorption data is limited. It is not a common allergen.

Research notes

Moderate evidence supports its UV-absorbing ability, but there are fewer peer-reviewed studies compared to more widely used UV filters.

Common label clues

Typical concentration
Up to 10% in leave-on products
Regulatory status
Approved for use in cosmetics in the EU and other regions, but not currently listed as a permitted UV filter by the US FDA.
Common uses
Sunscreens, Moisturizers with SPF, Anti-aging products
Environmental note
Synthetic UV filters have been detected in aquatic environments; however, the environmental impact of this specific compound is not well-documented.

Good to know

  • This ingredient is often combined with other UV filters to boost overall protection.
  • It is approved for use in cosmetics in several regions, but not as common as some other filters.

Common questions

What is Oxobenzoxazinyl Naphthalene Sulfoanilide in beauty products?

This is a man-made ingredient that absorbs ultraviolet (UV) light, especially UVA rays, to help prevent them from damaging your skin. It's often used in sunscreens and other products to keep the formula stable and effective under sunlight.

What does Oxobenzoxazinyl Naphthalene Sulfoanilide do in a beauty product?

It works by absorbing UV light and releasing the energy as heat, which stops the UV rays from reaching deeper layers of your skin and causing damage like sunburn or premature aging.

Is Oxobenzoxazinyl Naphthalene Sulfoanilide safe for most people?

Generally considered safe at low concentrations in cosmetics, but long-term skin absorption data is limited. It is not a common allergen.

Who should be careful with Oxobenzoxazinyl Naphthalene Sulfoanilide?

Individuals with known allergies to synthetic UV filters Those preferring mineral-only sunscreens

Research sources

CosIng Database (EU)OpenPubMed - UV Filter SafetyOpen

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.