"You should be well aware that an individual supplement maker cannot afford the kind of research you are talking about. However, due to the extremely small particle size (as small as 0.64 nanometer) it is believed that US and Mesosilver do cross the blood brain barriers "
This transmission electron microscope photo is of CS made by the SG6 Auto unit. The typical particle size is in the range of .001 to .005 um.
1 micrometer = 1 000 nanometer
So the SG6 unit makes silver particles as small as 1 nanometer. Ionic Silver made by current controlled electrolysis is also extremely small. Not much of a difference at all. Ionic silver also regenerates tissue, colloidal does not. Whether or not Colloidal Silver gets to areas of the body that ionic won't reach is speculation at best. Ionic actually has much more killing power.