Various forms of Graphene and Graphene Oxide (GO) are potentially toxic and not good for the body.
Took me a while to find ( my file skills suck- thxs for global search), but I dug up the reference from a few years back.
https://particleandfibretoxicology.biomedcentral.com/articles/10.1186/s12989-016-0168-y
Thank you for that original link from my last comment. Clearly they have been at this for sometime.