I've just been reading this again. I see where she comments about digestive enzymes helping with food allergies. My cats do get Krill oil (omega 3) every other day, and a probiotic every day. I recently started supplementing one drop of vitamin E every 4-5 days and I have one cat taking digestive enzymes.
Her comment about worrying about "microscopic amounts of filler in a capsule" hit home, because that IS something I worry about.