Are you running this place now? did you tell the real boss here yet?
Graphene is magnetic and you have no clue what you talk about.
Graphene can be "doped" with other elements that will make it magnetic; but, that is true about many other substances as well.
You would have to know the specific construction of the graphene present in order to make your claim. Magnetic material in your body is not necessarily harmful. The iron in your body IS magnetic, but iron is essential.
Graphene is magnetic only when the crystal lattice is doped with particular elements. Otherwise, it is merely carbon, which is not magnetic.