The ideal health product is one that has no side effects, is effective against the tumor and accumulates in the tumor. Conversely, if it is distributed everywhere, it should be non-toxic and remotely activated. By adding specific ligands to their surface, nanoparticles will be able to move to targeted locations in our body. The purpose of using these nanoparticles is to improve therapy, while avoiding the exposure of our body to a risk of toxicity. Some nanoparticles are now being developed for use as theranostics, a method using imaging to map cancer sites for targeted treatment.