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While the majority of chemicals in cosmetic products present slight or no risk, dozens are associated with substantial medical conditions, such as cancer, and neurological harm. Chemicals in cosmetics enter a person's body through the skin and inhalation, and pose similar problems as food chemicals, per this site.

Chemicals and contaminants linked to cancer can be found in food, water, and lots of other commonly used goods. However, no sector of consumer goods is subject to less government direction than cosmetics, including Biotin Nail Hardener. While most of the chemicals in cosmetics and personal care products likely present little risk, exposure to a few has been linked to major health problems, including cancer.