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While the majority of chemicals in cosmetics present hardly any or zero risk, dozens have been linked to considerable health conditions, including developmental delays and cancer. Cosmetic chemicals enter a person's body through inhalation, the skin, and ingestion, and lead to similar dangers as food chemicals, per this site.

Contaminants and chemicals linked to cancer can be found in water, food, and many other everyday products. Still, no classification of consumer products is accountable to less government oversight than cosmetics and other personal products, including Oh...To be 25 Again. Although most of the chemicals in cosmetics in all likelihood pose minimal risk, being exposed to some is linked to major health concerns, including cancer.