[Avodah] Kintiyot derivatives

[Ben Waxman]

I just saw that the OU rules that iodized salt must be kasher l'pesach 
because it uses a corn derivative. Tara milk puts in a vitamin D 
supplement that comes from a plant so it is labeled "L'ochlei kitniyot 
bilvad".

Are there any kashrut agencies that pasken the " derivatives of kitniyot 
aren't kitniyot" rule? I know of rabbanim who rule this way, that isn't 
my question.

Ben