The only medical use of silver (particularly as a colloid) is giving yourself heavy metal toxicity so if you want your eyes to turn grey and your skin to turn purple then go ahead and eat some jewelry.
There are so many NPs synthesized by the researchers, among these nano-structures silver have shown diverse biomedical application because of their fascinating properties. In current time, scientists are focusing to synthesized these silver nanoparticles through green chemistry following their principles.