1) A few days ago the Japanese officially halted Moderna shots due to something metallic/magnetic found in them:
"ministry said later in the day that the substance that had been mixed in may have been metal. "It's a substance that reacts to magnets"
asia.nikkei.com/Spotlight/Coronavirus/COVID-vaccines/1.6m-Moderna-doses-withdrawn-in-Japan-over-contamination
2) And of course we are also familiar with the "magnets sticking to the injection sites" videos.
3) There is also widely published research from 2016 that it is possible to "control brain activity with injected magnetic nanoparticles heated by radio waves".
theguardian.com/science/neurophilosophy/2016/mar/24/magneto-remotely-controls-brain-and-behaviour
4) Some Spanish researchers claimed that they found graphene oxide in the shots about a month ago, but it was widely disputed even among non-Spanish people.
healthfeedback.org/claimreview/there-is-no-conclusive-evidence-that-the-pfizer-biontech-covid-19-vaccine-contains-graphene-oxide/
5) Now Robert Young extensively analyzed four different vaxxes with several methods and also found several non-disclosed ingredients, including what looks like graphene oxide:
drrobertyoung.com/post/transmission-electron-microscopy-reveals-graphene-oxide-in-cov-19-vaccines
There are lots of microscope images and analysis in the article, so I suggest you at least skim it.
Of course Robert Young is not "neutral" on this question and even his PhD is disputed, so take his findings with a grain of salt. At the very least his data shows similar contamination as has been discovered by Italian researchers in other vaccines years ago:
medcraveonline.com/IJVV/new-quality-control-investigations-on-vaccines-micro--and-nanocontamination.html