There are no reported health effects associated with prolonged exposure to pure calcium carbonate. This classification is based on the findings of laboratory animal studies that were considered to provide sufficient evidence and data from human epidemiological studies that were considered to provide limited evidence for carcinogenicity.
Crystalline silica is also a known cause of silicosis, a noncancerous lung disease.
NTP and OSHA have not classified crystalline silica as a carcinogen. Flush eyes with water for 10 minutes. If irritation persists, obtain medical attention. Wash from skin with mild soap and water. Ingestion should not cause any significant health problems.