...and find a kazillion sources for Lugol's cheap!
I will keep googling to find out who/what "Weigert" actually is, but all of them I've clicked on so far offer Lugol's with the perfect "recipe" AND regeant/acs quality.
They can have/shove/keep their "USP" technicalities; I'm sure that acs/regeant + the correct recipe + pure water is what I'm looking for.
Besides, when in history did "USP" appear? People were probably 'lugoling' for decades without finding it necessary.