i dont thave the strongest kidneys, but they seemed uneffected(adversely anyway) by the cs.
my liver on the otherhand would really ache sometimes. my investigations revealed that the silver can interfere with glutathione metabolization. the answer was extra vit E and selenium. worked like a charm.
I take about 100ml in the morning & again at night & I haven't had any kidney problems, although years ago (before I started on CS) I did have 2 occurrances of kidney disease so if the cs was going to do anything to kidneys I'd expect it to do mine.