March 21, 2018
Updated March 23, 9:47 a.m. PST
The following is my understanding of what can turn you blue followed by an article discussing the science on the subject of argyria as it relates to silver.
When colloidal silver is made properly, one step of the process is to make ionic silver first and then to reduce the ionic silver into colloidal silver. Silver ions are much smaller than silver nanoparticles. In fact, they are so small that they can readily enter into cells of the body. Silver nanoparticles are too large to enter into cells of the body. Another important production step that ionic silver makers rarely use or consider is that high quality colloidal silver nanoparticles should be capped in order to withstand the stomach acid and sodium chloride without being converted into some other form of silver such as silver chloride. The capping agent not only protects the silver particles from being altered, it also increases the zeta potential of the particles which keeps them from aggregating to form larger particles that eventually grow to such a large size that they fallout of suspension. The capping agent does not improve the zeta potential, but has a very similar effect by keeping the silver nanoparticles from touching each other so they cannot easily agglomerate but still protect the particles from the stomach acid and other content.
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