Together with potassium bicarbonate, they’re both naturally occurring inorganic compounds (4), which almost have no side effects and their safety as food additives has been approved by the FDA, EFSA and JECFA and other authorities.
FDA
Potassium carbonate is generally recognized as safe (GRAS) as a direct human food ingredient. It is used as a flavoring agent and adjuvant, nutrient supplement, pH control agent, or processing aid in food with no limitation other than current good manufacturing practice. (5)
EFSA
Potassium carbonate E501(i) is listed in Commission Regulation (EU) No 231/2012 as an authorised food additive and categorized in “ Additives other than colours and sweeteners” (6).
JECFA
Function Class: food additives, acidity regulator. (7)
Acceptable daily intake: ADI “not limited” was set in 1965. (8)
http://www.chinafooding.com/Potassium_carbonate
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