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While most chemicals in beauty products and cosmetics present minimal or no risk, some are linked to serious medical problems, such as neurological harm and cancer. Chemicals in cosmetics can enter a person's body through inhalation, ingestion, and the skin, and pose similar risks as food chemicals, per this site.

Chemicals and contaminants linked to cancer are found in water, food, and lots of other commonly used items. However, no area of consumer items is accountable to less government inspection than cosmetics, including Who Are You Wearing. While many of the chemicals in cosmetics and personal care products likely pose little risk, being exposed to a few has been linked to major health conditions, including cancer.