All colloidal silver solutions are not considered equal. There are certain key points to consider when looking for colloidal silver: proper form, solution concentration, color, and packaging.
It is in an atomic form which means that because of its molecular structure it will not deposit into the cells and it is easily utilized by the body. That which is not used is excreted in the urine. Compared to ionic forms which are unstable and whose solutions are weak, separate, and deposit into the cells, ATOMIC versions like this one found at Physician's Preference will not.
Natural Path/Silver Wings Colloidal Silver is of pharmaceutical grade (99.9% pure silver) with particles that fall in the range of .002-.001 microns. These particles are too small to be seen with the naked eye. If you can see particles, the colloidal silver is not safe. This colloidal silver is delivered in dosages of 250ppm (parts per million) as opposed to other weaker versions found on the market with 10-30 ppm. Due to the higher, more effective concentration, this colloidal silver is dark orange-brown in color and is only distributed in protective glass bottles. Plastic bottles produce toxins and the particles in the colloidal silver will not hold their bonds; thus the glass bottle is how it must be packaged.
Colloidal silver from Natural Path/Silver Wings is non addictive and does not have any interactions with other supplements. Colloidal Silver from Natural Path/Silver Wings is the only choice for Physician's Preference because they provide the finest colloidal silver on the market. Shake the bottle well before each use.