THEN DON’T EAT IT.

I don’t know. But feldspar is frequently used in abrasive cleaners. BKF has the smallest size of all I’ve checked, i.e. least physically abrasive.

Those scrubbing particles are just feldspar in this case. Literally ground up rock. It’s the most widely available mineral on the planet. Not rocket science: abrasives work.

Yes thank you for saying this. I just saw a veterinary site that talked about how harmful this product is if inhaled or ingested based on amount.
“The principle ingredient of Bar Keeper’s Friend products is oxalic acid. Oxalic acid has toxic effects through contact and if ingested. It is extremely destructive to tissue of mucous membranes and upper respiratory tract; harmful if swallowed; harmful to and destructive of tissue and causes burns if absorbed through the skin or is in contact with the eyes. Symptoms and effects include a burning sensation, cough, wheezing, laryngitis, shortness of breath, spasm, inflammation and edema of the larynx, inflammation and edema of the bronchi, pneumonitis, pulmonary edema.”

Water is ‘natural’ and mostly non toxic – but take too much water (no matter how pure) at once and it will kill you.