- Formaldehyde has a long history of safe use in the manufacture of certain viral and bacterial vaccines.
- Formaldehyde is added to vaccines to kill unwanted bacteria and viruses that might contaminate the vaccine during production.
- Formaldehyde is a human carcinogen according to the National Institute of Environmental Health Sciences.
- It is used to inactivate viruses so that they don’t cause disease (e.g., polio virus used to make polio vaccine)
- It is also used detoxify bacterial toxins, such as the toxin used to make diphtheria vaccine.