I really wanted to comment on this, because some people might find hard to believe it - I have serious neurological damage that I didn't have before, still after 8 months, as a consequence of a medical test called Electromiography, which is also maximum 9v.
I read that these reactions are very personal and electrocution starts at 9v.
It must be said that I had some peripheral nerve damage already before, and that test was a routine test out of many I had to do to see what was happening, I didn't think that it would maim me.
I also wanted to say: please don't think this is permanent, peripheral nerves can heal. I am recovering very well after months of unthinkable agonising pain (thank you EMG test) thanks to a protocol of alpha lipoic acid and hemp oil and other things.