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While the majority of chemicals in beauty products pose hardly any or zero risk, some have been linked to severe health problems, such as cancer, and neurological harm. Chemicals in cosmetics can enter the body through inhalation, ingestion, and the skin, and cause similar risks as food chemicals, per this site.

Chemicals linked to cancer can be found in water, food, and various other commonly used products. However, no category of consumer products is subject to less government inspection than cosmetics, including Zinc. While most of the contaminants and chemicals in cosmetics and personal care products almost certainly present minimal risk, subjection to some is linked to substantial health problems, including cancer.