A US Federal Court has ruled that California titanium dioxide warning requirement is not-scientifically justified 

On 12 August 2025, a US federal court issued a permanent injunction preventing California from enforcing Proposition 65 warning requirements for certain forms of titanium dioxide (TiO₂) used in cosmetics and personal care products in a case brought by the US Personal Care Products Council (PCPC). 

Court’s Findings  

The court ruled that the mandated warning was misleading because it implied a proven risk not supported by scientific consensus.  Regulatory authorities, including the US Food and Drug Administration (FDA) and European agencies, have not identified a causal link between cosmetic use of TiO₂ and health outcomes.  

Outcome  

The court’s decision permanently prevents California from bringing new Proposition 65 enforcement cases for TiO₂ in cosmetics and removes the requirement for companies to apply such warnings going forward. The judgment also underlines that mandatory product warnings must be based on clear and balanced scientific evidence. 

Background  

Proposition 65 is California's law requiring businesses to provide warnings about exposure to chemicals known to cause harm. 

Source: The Personal Care Products Council. (2025, August 12)