<unk>  (SIPPs) are nanoparticles that have been reported as magnetic resonance imaging contrast agents. These are, however, investigational agents which have not yet been tried in humans.
Superparamagnetic iron–platinum particles
Protein-bound paclitaxel
Silver nanoparticle
Sodium ferric gluconate complex
Radioactive nanoparticle
Hemichrome
Arabinopyranosyl-N-methyl-N-nitrosourea
Activated carbon