Tinosorb S or bemotrizinol (INCI: bis-ethylhexyloxyphenol methoxyphenyl triazine) is an organic and nanoparticle based sunscreen filter that covers both UVB and UVA rays.
It is an oil soluble chemical compound that has a light yellow color and a powder consistency. It shows a very high compatibility with other both organic and inorganic sunscreen filters.
Tinosorb S spectrum range and stability
Bemotrizinol is a broad-spectrum UV filter, so it covers both UVA and UVB rays with a 310-340 nm absorption peak.
Bemotrizinol is an highly photostable sunscreen filter which shows minimal degradation after sun exposure so it has a longlasting protection effect. Furthermore it has been proven that it improves both avobenzone and octinoxate stability when they are combined.
Tinosorb S safety and allergies
Tinosorb S is not significantly absorbed through the skin and an in vitro study concluded that it does not have any estrogenic or androgenic activity1 Ashby J, Tinwell H, Plautz J, Twomey K, Lefevre PA. Lack of binding to isolated estrogen or androgen receptors, and inactivity in the immature rat uterotrophic assay, of the ultraviolet sunscreen filters Tinosorb M-active and Tinosorb S. Regul Toxicol Pharmacol. 2001;34(3):287–291. doi:10.1006/rtph.2001.1511 so it does not pose a risk as an endocrine disruptor.
Unlike other chemical sunscreen filters, this sunscreen filter does not pose any type of allergy risk and only a few cases of contact dermatitis allergy have been reported.
Furthermore this sunscreen filter does not produce free radicals and it’s one of the best choices for anti-aging purposes due to its excellent performance.