Around May 2021 rumours abounded that certain mRNA biotech delivery systems were magnetically active. Prompted by state-owned broadcaster France24, :fr:Julien Bobroff who specialises in magnetism and teaches at the University of Paris-Saclay debunked the claims of Covid-19 conspiracy theorists using an ad verecundiam argument, as follows: "A vaccine against Covid-19... that would make magnets stick to the skin once injected is absolutely impossible from a scientific standpoint."
