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Though many chemicals in cosmetic products present slight or absolutely no danger, some are associated with serious medical issues, including cancer, reproductive and neurological harm, and developmental delays. Chemicals in cosmetics enter a person's body through inhalation, the skin, and ingestion, and pose similar problems as food chemicals, per this site.

Contaminants and chemicals associated with cancer can be found in food and various other common items. Still, no category of consumer items is subject to less government management than cosmetics, including Nature's Gate Mineral Sportblock SPF 20 Fragrance-Free. While many of the contaminants and chemicals in cosmetics and personal care products very likely pose very little risk, exposure to some is associated with serious health concerns, such as cancer.