Bemotrizinol

Bemotrizinol (INCI: bis-ethylhexyloxyphenol methoxyphenyl triazine) is the INCI name behind the Tinosorb S brand — the benchmark modern sunscreen filter. It combines high UVB extinction with unusually strong long-UVA absorption to nearly 400 nm, remains stable under hours of irradiation, and stabilises less durable filters like avobenzone in mixed systems. Its molecular bulk minimises skin penetration and systemic exposure; allergy rates are among the lowest recorded. Regulatory status: EU-approved, widely used in Asia, not yet FDA-approved in the US — hence its absence from American formulas. Anyone choosing a sunscreen by filter quality should seek it out.