Is potassium chloride safe as a food preservative?
KCl is generally safe for consumption. It is already sold in a pure state in the spice section of your grocery store as Nu Salt. However, it is more bitter than standard salt. Consuming way too much can cause dehydration since it is a diuretic.
As a preservative, it would not be a good substitute for regular salt (NaCl). It would taste horribly bitter and really dehydrate you.
Also consider that potassium chloride is the 3rd shot in the process of “lethal injection”.