It's really quite amazing what the fda can be "unaware" of...
ozone, silver


from:
http://www.fda.gov/
search on silver
    "  February 12, 1997

      COLLOIDAL SILVER NOT APPROVED FOR
      TREATING ANIMALS

      FDA has received reports that products containing colloidal
      silver are being promoted for use in the treatment of mastitis
      and other serious disease conditions of dairy cattle, as well as
      for various conditions of companion animals. For example, FDA's
      Center for Veterinary Medicine has received reports from the
      Agency's regional milk specialists and State inspectors that
      colloidal silver products have been found on some dairy farms.
      Also, recent articles in some farm newspapers and journals
      promote the use of colloidal silver in treating mastitis and
      claim that no milk discard is needed. 

      FDA is not aware of any substantial scientific evidence that
      supports the safe and effective use of colloidal silver
      ingredients or silver salts for any animal disease condition.
      Also, in the October 15, 1996 Federal Register, FDA proposed to
      establish that all over-the-counter human drug products
      containing colloidal silver ingredients or silver salts for
      internal or external use are not generally recognized as safe
      and effective and are misbranded. 

      Use of colloidal silver ingredients in food-producing animals
      constitutes a potentially serious public health concern because
      of the possibility of residues in milk or meat. According to
      several scientific publications mentioned in the October 15,
      1996 Federal Register proposal, the human consumption of silver
      may result in argyria -- a permanent ashen-gray or blue
      discoloration of the skin, conjunctiva, and internal organs. 

      In addition to the possible human health concerns, use of these
      products to treat a serious illness in animals (including pets)
      could potentially endanger the health of the animal by delaying
      timely, appropriate treatment. 

      Colloidal silver-containing products have not been approved by
      FDA for use in any animal species. Promoting the use of
      colloidal silver for treating animal diseases causes such
      products to be misbranded veterinary drugs under the Federal
      Food, Drug, and Cosmetic Act (the Act). Labeling colloidal
      silver products to treat animals causes such products to be new
      animal drugs which are adulterated under the Act. 

      FDA has taken action against colloidal silver products, and is
      continuing to investigate the promotion and use of colloidal
      silver products in dairy and other animals. If necessary, FDA
      will take further appropriate regulatory action. "