Ingredient review
TEA-Phenylbenzimidazole Sulfonate
INCI: TEA-Phenylbenzimidazole Sulfonate
A widely used, water-soluble UVB filter that is generally gentle on skin but offers no UVA protection on its own.
In plain English
This is a sunscreen ingredient that absorbs ultraviolet B (UVB) rays — the kind that cause sunburn and contribute to skin cancer. It dissolves in water, so it feels light on the skin and doesn't leave a white cast like some other sunscreens. However, it does not protect against UVA rays (which cause aging and deeper skin damage), so it is almost always paired with other sunscreen ingredients for broad-spectrum protection.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is relatively strong for its common cosmetic role.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- strong
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
TEA-Phenylbenzimidazole Sulfonate 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 TEA-Phenylbenzimidazole Sulfonate.
- 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
strongThere is a stronger practical or research basis for the ingredient role described here.
What it is
A synthetic, water-soluble organic compound that absorbs UVB radiation (280–320 nm). It is the triethanolamine (TEA) salt of phenylbenzimidazole sulfonic acid, making it more stable and easier to formulate into water-based products.
How it works
When applied to the skin, the molecule absorbs UVB photons and converts them into harmless heat, preventing the energy from damaging skin cells. Because it is water-soluble, it sits in the water phase of a formula, contributing to a lightweight, non-greasy feel.
Pros
Lightweight feel
Because it dissolves in water, it doesn't add greasiness or heaviness, making it ideal for daily wear under makeup or for oily skin types.
No white cast
Unlike mineral sunscreens (zinc oxide, titanium dioxide), this ingredient leaves no visible residue, so it works well on all skin tones.
Cons and cautions
No UVA protection
On its own, it only blocks UVB rays, so you must use it in a broad-spectrum formula to protect against skin aging and deeper damage.
Potential eye irritation
If the product migrates into the eyes, it can cause stinging or burning, especially for contact lens wearers or those with sensitive eyes.
Best for
- People with oily or combination skin who prefer lightweight sunscreens
- Those looking for a non-whitening UVB filter
Use caution if
- Anyone relying on a single sunscreen ingredient for full protection (always use broad-spectrum)
- People with very sensitive eyes (may cause stinging)
Usage tips
Safety summary
Considered safe for use in cosmetics at regulated concentrations. It is non-comedogenic and has a low irritation profile, though eye stinging is a known issue. No serious health concerns have been identified in approved products.
Research notes
Extensive research supports its efficacy as a UVB filter. Human and animal studies show it effectively prevents sunburn when used correctly. It does not penetrate deeply into the skin, remaining mostly on the surface. Some lab studies indicate potential photodegradation, but modern formulations include stabilizers.
Common label clues
- Typical concentration
- Up to 4% in the US (regulated as a sunscreen active ingredient)
- Regulatory status
- Approved as a sunscreen active ingredient by the US FDA (up to 4%) and by the EU Cosmetics Regulation (up to 8% as Phenylbenzimidazole Sulfonic Acid). Always check local regulations as limits vary.
- Common uses
- Sunscreens, Daily moisturizers with SPF, Makeup with SPF
- Environmental note
- Some studies suggest organic UV filters may accumulate in aquatic environments, but TEA-Phenylbenzimidazole Sulfonate is generally considered less persistent than some other filters. Reef-safe claims are debated; check local guidelines.
Good to know
- In the US, it is FDA-approved as a Category I sunscreen active ingredient at concentrations up to 4%.
- It is often paired with octocrylene or avobenzone to stabilize the formula and extend protection.
- Some people report a slight yellow tint in high-concentration formulas, but this is rare.
Common questions
What is TEA-Phenylbenzimidazole Sulfonate in beauty products?
This is a sunscreen ingredient that absorbs ultraviolet B (UVB) rays — the kind that cause sunburn and contribute to skin cancer. It dissolves in water, so it feels light on the skin and doesn't leave a white cast like some other sunscreens. However, it does not protect against UVA rays (which cause aging and deeper skin damage), so it is almost always paired with other sunscreen ingredients for broad-spectrum protection.
What does TEA-Phenylbenzimidazole Sulfonate do in a beauty product?
When applied to the skin, the molecule absorbs UVB photons and converts them into harmless heat, preventing the energy from damaging skin cells. Because it is water-soluble, it sits in the water phase of a formula, contributing to a lightweight, non-greasy feel.
Is TEA-Phenylbenzimidazole Sulfonate safe for most people?
Considered safe for use in cosmetics at regulated concentrations. It is non-comedogenic and has a low irritation profile, though eye stinging is a known issue. No serious health concerns have been identified in approved products.
Who should be careful with TEA-Phenylbenzimidazole Sulfonate?
Anyone relying on a single sunscreen ingredient for full protection (always use broad-spectrum) People with very sensitive eyes (may cause stinging)
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.