Is colloidal silver a cure for sickle cell anemia? Keep in mind that here in the United States, by law, colloidal silver can only be sold as a mineral supplement, and not a “cure” or “remedy” for any disease condition. Yet, some people in other countries have reported colloidal silver to be helpful in resolving cases of sickle cell anemia. While there’s no medical literature supporting this claim, it’s cerrtainly an interesting one.