MAKEUP PRODUCTS (NON-PERMANENT)

While most chemicals in cosmetic products present little or no threat, several dozen have been linked with serious medical conditions, such as developmental delays and cancer. Chemicals in cosmetics can enter a person's body through inhalation, ingestion, and the skin, and lead to the same risks as food chemicals, per this site.

Chemicals and contaminants linked to cancer can be found in food and lots of other commonly used goods. Still, no type of consumer goods is accountable to less government management than cosmetics and other personal products, including inkwell eyeliners. Though many of the chemicals and contaminants in cosmetics most likely pose very little risk, exposure to some is linked to serious health concerns, such as cancer.