While nano-technology can be frightening when applied to substances that are toxic at any level, like mercury and genetically engineered pesticides, silver is a naturally occurring element found in the natural world, including at sizes measured on the nano-scale. Another concern with nano-technology is that they may take benign substances and combine them in ways that do not occur in nature. Fortunately, that is not the case for Sovereign Silver. Natural Immunogenics manufactures a Bio-Active Silver Hydrosol where pure silver (99.999% fine) is gently released into pharmaceutical grade purified water. The size of the particle, as small as 0.8 nanometers allows for efficiency of delivery and utilization by the body, along with easy excretion. See more about Why We Are Not Nanotechnology.