My comment was that if that person developed argyria, it was their fault for excessive usage. I should have also included that they probably used the wrong form but I was short on time, being busy with getting orders out.
For those who do not know the difference: CS is a preventative Antibiotic substance, The zapper is for an entirely different purpose, to kill already existing microbes. Although, in some cases, a zapper may be used to boost immunity, there is no conflict between the two modalities.