Kosher, except for Pesach
Description: Carbon dioxide (acidity regulator)
Function: acidity regulator
Rationale:
Kosher orgs (cRc/STAR-K) flag CO2 for carbonation as needing verification it wasn't produced from fermenting chametz/kitniyot grain for Passover use.
If you don't see a status above, it does not mean the additive is not kosher automatically - it might just not be documented in our database yet.