evidence: Taking colloidal silver by mouth is not thought to be safe or effective for any of the health claims that many manufacturers make. Silver is not an essential mineral, as some sellers of silver products say. [...] Manufacturers of colloidal silver products often say that their products are cure-alls. Some claim these products can improve your immune system and fight bacteria and viruses. And they say these products can treat cancer, HIV/AIDS, COVID-19, shingles, herpes, acne, eye diseases and prostatitis. [...] Colloidal silver products also may interact with medicines, such as some antibiotics and levothyroxine (Unithroid, Levoxyl, others).