Toxic nanoparticles called graphene oxide have been said to be in Covid vaccines, based upon a Spanish study. I could not find the study on the web, even abandoning Google and going Brave, so maybe not so brave. The mainstream was onto this in a flash, and issued denials. I respond after the lead in material. My position is an agnostic one, that further testing is needed by independent laboratories.
https://www.infowars.com/posts/warning-toxic-nanoparticles-used-to-amplify-mrna-in-covid-vaccine/