MAKEUP PRODUCTS (NON-PERMANENT)

While many chemicals in cosmetic products present hardly any or zero risk, some are linked with serious medical conditions, including neurological harm and cancer. Chemicals in cosmetics can enter a person's body through the skin and inhalation, and lead to similar dangers as food chemicals, per this site.

Contaminants and chemicals associated with cancer are found in food, water, and many other common products. However, no classification of consumer products is susceptible to less government inspection than cosmetics, including Neutrogena Intense Gel Eyeliner. Though many of the chemicals in cosmetics most likely present little risk, exposure to some has been associated with substantial health issues, such as cancer.