It's also added directly to food; mainly for coloring, but also as a thickener and to keep some powdered food, like confectioner's sugar, from clumping.   

If you want to avoid titanium dioxide, read labels carefully and stick to minimally processed whole foods.

Biointerfaces, Biomimicking, and Biohybrid Systems

The precipitation of titanium dioxide involves the reaction of titanium sulfate with an alkaline solution to form titanium hydroxide, which is then calcined to produce titanium dioxide. The precipitation process is crucial for achieving the desired particle size distribution, crystallinity, and purity of the final product.