Known chemically as Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, Tinosorb S has a long history of global use and broad-spectrum efficacy. Brandon Crist, vice president of business management at BASF Personal Care Americas, highlights the importance of sun protection: «Tinosorb S embodies the company's decades of innovation in sun protection.».

Absorbance at 310 nm and 340 nm

The filter has two absorption peaks at approximately 310 nm and 340 nm, covering the entire UVB and UVA spectrum. This optical signature targets the wavelengths most closely associated with skin damage and premature aging. Bemotrizinol is recognized for its efficacy and photostability, even under intense sun exposure.

Photostabilization of avobenzone and Z-Cote zinc oxides

Beyond its role as a filter, Tinosorb S acts as a photostabilizer in complex formulations. It helps stabilize more photolabile active ingredients, such as avobenzone, thereby enhancing the durability of UVA protection. In the United States, combining it with avobenzone or Z-Cote zinc oxides helps achieve a «critical wavelength» greater than 370 nm for the broad-spectrum claim. «Following this FDA approval, we are introducing a UV filter to the U.S. market that offers formulators a new opportunity to provide high-performance, broad-spectrum protection.», says Brandon Crist.

The large molecular structure of Tinosorb S results in low percutaneous absorption, which reduces the risk of irritation. This characteristic makes it suitable for high-performance sunscreens designed specifically for sensitive skin, in accordance with the intended use described for modern sunscreen formulations.

Developed by Ciba Specialty Chemicals and later integrated into BASF following an acquisition, bemotrizinol is now part of the Personal Care Division’s U.S. portfolio. FDA approval makes the active ingredient available for the U.S. sunscreen market under the name Tinosorb S.

In a consumer study involving 90 participants with wavy or curly hair, positive results were reported at the 8-hour mark: 68% felt that frizz was minimized, and 91% confirmed that shine was maintained. The average rating reached 8.0/10 at the end of the evaluation. On ex vivo hair strands, a single application significantly reduced frizz by 30%.

Up to 8 hours of curl definition

Evaluated using a multi-parameter approach, Liftilience immediately enhances the definition of natural curls, with all-day hold. A preliminary study on naturally curly hair strands demonstrates an immediate improvement that lasts up to 8 hours after application. An evaluation by expert hairstylists, combining visual and tactile criteria, also confirms the bounce and hold. Immediate effect observed.

30% reduction in frizz %

Beyond its defining properties, the active ingredient stands out for its ability to prevent and reduce frizz. Immediately after a single application on ex vivo hair strands, frizz was reduced by 30%. Volunteers confirmed these observations at 8 hours, and hair shine remained, as reported by 91% of participants. These results apply to textured hair.

Helical biopolymers and their use in formulations

Derived from chestnuts, this active ingredient is based on functionalized helical biopolymers. It combines film-forming properties, shrinkage power, and adhesion. This three-pronged approach underpins the definition and bounce of curls, as well as frizz control. The positioning of hair care formulas designed for textured hair is clear. A key consideration for formulators.

Liftilience is recommended at a concentration of 0.08 to 0.16 %. Available as a preservative-free powder, it is described as easy to formulate. The active ingredient has a natural content of 100% (ISO 16128), complies with biodiversity regulations, and meets international cosmetic regulations (Europe, United States, China, Japan, etc.). Silab specifies a local supply of chestnuts from certified organic farmers, with traceability down to the individual plot.