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While most chemicals in cosmetics present very little or no threat, several dozen have been linked with severe health issues, including cancer, reproductive and neurological harm, and developmental delays. Cosmetic chemicals get into the body through ingestion, inhalation, and internal use, and cause the same problems as food chemicals, per this site.

Chemicals and contaminants linked to cancer can be found in food and many other common products. Still, no group of consumer products is accountable to less government oversight than cosmetics, including I Heart My Instructor. Though many of the chemicals in cosmetics and personal care products likely present minimal risk, subjection to some is linked to major health concerns, such as cancer.