references
  
      National Library of Medicine: “Titanium dioxide”
    
      U.S. Food and Drug Administration: “Questions and Answers: FDA posts deemed final order and proposed order for over-the-counter sunscreen”
    
      European Food Safety Authority: “Titanium dioxide: E171 no longer considered safe when used as a food additive”
    
      U.S. Food and Drug Administration: “Code of Federal Regulations Title 21”
    
      New Jersey Department of Health: “Hazardous Substance Fact Sheet: Titanium Dioxide”
    
      International Journal of Environmental Research and Public Health: “Impact of Food Additive Titanium Dioxide on Gut Microbiota Composition, Microbiota-Associated Functions, and Gut Barrier: A Systematic Review of In Vivo Animal Studies”

Is this an emergency? If you are experiencing serious medical symptoms, please see the National Library of Medicine’s list of signs you need emergency medical attention or call 911.

Some tampons include titanium dioxide, which makes them appear whiter and brighter.

Image Credit: simarik/iStock/GettyImages

Image Credit: simarik/iStock/GettyImages

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      National Library of Medicine: “Titanium dioxide”
    
      U.S. Food and Drug Administration: “Questions and Answers: FDA posts deemed final order and proposed order for over-the-counter sunscreen”
    
      European Food Safety Authority: “Titanium dioxide: E171 no longer considered safe when used as a food additive”
    
      U.S. Food and Drug Administration: “Code of Federal Regulations Title 21”
    
      New Jersey Department of Health: “Hazardous Substance Fact Sheet: Titanium Dioxide”
    
      International Journal of Environmental Research and Public Health: “Impact of Food Additive Titanium Dioxide on Gut Microbiota Composition, Microbiota-Associated Functions, and Gut Barrier: A Systematic Review of In Vivo Animal Studies”