The failures all seem to be associated with one of three things, viz. insufficient dosing, not taking suitable emetics, or being found before death occurs.
Why buy 25 kg, two thousand times more than you will need ?
And what is a credtit?
I would have thought, as it's a conservant found in yummy sausages, it should be possible to consume the stuff in a meal and save on emetics - has nobody thought of this yet or is there a scientific reason nobody does it ? You would be able to use a very ample dose...
The 25 kgs was what I spontaneously found offered on amazon - and the exotic explanation I have for that is that nobody thinks about SN as a suicide means. The supplier is obviously expecting some local sausage/cured ham maker to order the stuff, they are abundant here.
Such people wouldn't need just 15 grams, that sort of thing would be both suspect and hilarious, as in utterly implausible.
Credit is what I chose to resemble both euro and dollar fiats. I have a faible for typos.