Nature protects human and animal tissues against infectious germs by making HOCL at sites of injury or contamination by bacteria. The HOCL is made on demand, as needed, at sites of tissue damage and is the most powerful local anti-germ substance manufactured in the body. It has to protect against all classes of invaders, including bacteria, yeasts, viruses, and molds, and it has to be able to kill them quickly. White blood cells circulating in the blood are a rich source of HOCL, and they move into the local tissues where there are injuries or damage. Because HOCL kills so fast and so efficiently but has to be compatible with all the healthy tissues in the body, it is uniquely powerful yet uniquely safe. Nothing can develop resistance to HOCL because it attacks at many different places on and in contaminating germs of all kinds.