INCI: Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine
Tinosorb S (BEMT, bemotrizinol) is a modern photostable broad-spectrum organic UV filter by BASF that absorbs both UVB and UVA radiation. Approved up to 10 % in EU and most of Asia, not approved as an over-the-counter sunscreen filter in the US as of 2026. Stabilizes other filters in the formula.
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
One of the few organic filters with high photostability and broad coverage. Works against UVB and the full UVA range, shows good skin tolerance.
Tinosorb S is the trade name for Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, also known as bemotrizinol or BEMT. BASF developed it as a photostable, broad-spectrum organic UV filter that absorbs both UVB and UVA radiation in the 280-400 nm range. Maximum allowed concentration in sunscreens is 10% in the EU and most of Asia. Tinosorb S is not approved for over-the-counter use in the United States as of 2026. What sets Tinosorb S apart is photostability. Unlike older filters such as avobenzone or octinoxate, Tinosorb S barely degrades after hours of UV exposure. It also stabilizes other less-stable filters in the same formula. Adding 2-3% Tinosorb S to an avobenzone-based sunscreen significantly slows avobenzone breakdown. Modern Asian and European sunscreens use Tinosorb S as the photostability backbone of the formula. Pregnancy safety. Tinosorb S is currently rated as caution during pregnancy. Systemic absorption from intact skin is below 1% in available studies, the molecule is large and lipophilic. There is no signal of endocrine disruption in animal data and no documented teratogenic effects. The caution rating reflects the limited human pregnancy literature rather than positive harm. Skin safety. Low irritation and low allergen risk in patch tests. Sensitive and rosacea-prone skin generally tolerates Tinosorb S well. Comedogenic potential is minimal. Comparison with Tinosorb M (Bisoctrizole, MBBT). Tinosorb M is a particle that scatters and absorbs UV, while Tinosorb S is a fully soluble molecule. The two are often combined in modern sunscreens to give complete UVA1+UVA2+UVB coverage with one set of ingredients. Tinosorb S is one of the safest broad-spectrum filters available outside the US market. People shopping for high-tier sunscreens in Europe, Korea, Japan, and Australia should look for it on the INCI label. Bottom line. Tinosorb S is a modern, photostable UV filter that covers UVB and UVA, stabilizes other filters, and has a low irritation profile. The caution flag in pregnancy is a precautionary stance rather than a sign of harm.
Irritation potential
LowAllergen risk
LowPregnancy
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Tinosorb S should be used with caution during pregnancy. Consulting a dermatologist or OB-GYN is advisable.
Tinosorb S suits: normal, dry, oily, combination, sensitive.
Tinosorb S (BEMT, bemotrizinol) is a modern photostable broad-spectrum organic UV filter by BASF that absorbs both UVB and UVA radiation.
The INCI name is Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine. It may also appear as: Bemotrizinol, Anisotriazine, BEMT.
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