evidence: There have been multiple claims made online which say that the Pfizer vaccine contains 99% graphene oxide, a substance which is derived from graphite. The claims originate from a Spanish study and have been circulating in English (across the UK and the US), in Spanish and in Portugese. They are not true. [...] The concern around the presence of graphene oxide in the Pfizer vaccine seem to be based on a Spanish study which says that on transmission electron microscopy (a microscopy technique which allows particularly fine details and structures to be seen), the solution created from a vial of the Pfizer vaccine takes a very similar form to graphene oxide. [...] A spokesperson for Pfizer also told Full Fact that "Graphene oxide is not used in the manufacture of the Pfizer-BioNTech Covid-19 vaccine".