Food-grade vs feed-grade vs industrial baking soda
Food-grade sodium bicarbonate (USP / FCC) is the only acceptable grade for human consumption and must ship with a kosher and halal certificate plus full heavy-metal panel. Feed grade meets AAFCO definitions and is buffered to maintain rumen pH in dairy cattle. Industrial / technical grade carries a slightly looser heavy-metal spec and is the standard for flue-gas scrubbing in cement and waste-to-energy plants across Ontario.