Vaccines Contaminated by Glass Recalled! Thank Goodness! Hopefully the vaccines won't get contaminated with other crap like MSG, formaldehyde, latex, or mercury and aluminum!! Update: someone just informed me that vaccines do indeed contain MSG, formaldehyde, latex and mercury and aluminum. They also contain human DNA residue from the virus culturing process. Do you have any idea what these substances can do to you and your immune system once they are in your bloodstream?