The reason I picked them is, as you said, that cause and effect are easily linked in their case. Colloidal silver is suspected to lead to kidney damage, but it

The reason I picked them is, as you said, that cause and effect are easily linked in their case. Colloidal silver is suspected to lead to kidney damage, but it's much less conclusive. I'd also call "you turn into a smurf" enough harm to count, but I didn't want to argue semantics.