A substance that can prevent powdery particles from sticking to each other is called an anti-caking agent. There is anti-caking agent B in salt, so it is harmless to eat salt every day. As an internationally used anti-caking agent, Europe and the United States also allow the addition of potassium ferrocyanide to salt, which will not affect the body if eaten normally.

Moreover, the standards in China are stricter than those in the United States. The United States suggests that ferrocyanide below 1.3mg/kg can be added to table salt, while the maximum dosage in China is 10mg/kg. The structure between iron and cyanide in "potassium ferrocyanide" is stable, and it can be decomposed into potassium cyanide only when it is higher than 400, but the daily cooking temperature is "usually" lower than 340, so the possibility of decomposition of potassium ferrocyanide at cooking temperature is extremely small. The recommended daily intake of salt in China is 6g.