Yes if you look up research they figured out how to stop graphene oxide from being toxic by coating it perhaps with the lipid nanos they were able to make a superior adjuvant and delivery system

"However, GO aggregates in biological liquid and induces cell death, and it also exhibits poor biosolubility and biocompatibility. To address these limitations, various surface modification protocols have been employed to integrate aqueous compatible substances with GO to effectively improve its biocompatibility. More importantly, these modifications render functionalized-GO with superior properties as both carriers and adjuvants."