MAKEUP PRODUCTS (NON-PERMANENT)

While most chemicals in cosmetics pose hardly any or zero threat, several dozen have been linked to considerable medical problems, such as developmental delays and cancer. Chemicals in cosmetics invade the body through the skin and inhalation, and pose similar problems as food chemicals, per this site.

Chemicals linked to cancer are found in water, food, and a lot of other ordinary products. Still, no classification of consumer products is subject to less government management than cosmetics, including Gel Eyeliners. Although most of the chemicals in cosmetics likely pose very little risk, being exposed to some is linked to substantial health concerns, such as cancer.