This page of the Report on Carcinogens by the National Institutes of Health (NIH) summarizes the research findings on coal tars.
Because of their extremely small size and large surface area to volume ratio, nanoparticles can easily cross the biological cells and membranes.
In a study by Coccini et al, published in the journal Neurotoxicology, titanium dioxide nanoparticles were reported to enter the brain, where they can cause neurotoxic effects.
The Campaign for Safe Cosmetics is a project of the Breast Cancer Prevention Partners (https://www.bcpp.org/).
Benzophenone is used in personal care products such as lipstick, nail polish, foundation, fragrance, shampoo, conditioner, and hair spray to protect the products from UV light.
A study by Pan et al looked at the effect of parabens, which act as estrogens, on breast cancer. They found that parabens stimulate the proliferation of breast cancer cells.
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