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While most chemicals in beauty products present hardly any or zero threat, several have been linked to significant medical problems, including cancer, reproductive and neurological harm, and developmental delays. Chemicals in cosmetics can enter the body through ingestion, inhalation, and internal use, and lead to the same dangers as food chemicals, per this site.

Chemicals and contaminants associated with cancer can be found in food and many other common products. Still, no group of consumer products is susceptible to less government direction than cosmetics and other personal care products, including Tattoo Guard Sunscreen Stick SPF 50. While many of the chemicals and contaminants in cosmetics probably pose very little risk, being exposed to a few is associated with critical health issues, including cancer.