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While many chemicals in cosmetic products pose minimal or zero risk, dozens have been associated to substantial health issues, such as cancer, reproductive and neurological harm, and developmental delays. Chemicals in cosmetics invade the body through the skin, inhalation, ingestion and internal use, and cause the same problems as food chemicals, per this site.

Chemicals associated with cancer are found in food and several other ordinary products. However, no group of consumer products is susceptible to less government direction than cosmetics, including Kiehl's Lip Balm SPF 15 Petrolatum Lip Protectant. Though many of the chemicals in cosmetics almost certainly pose minimal risk, subjection to some is associated with significant health issues, such as cancer.