This substance is a white crystalline powder that has a glass-like appearance. It is stable in the air and highly soluble in water. Although it does not produce any odors or vapors, it does create a strong saline flavor when mixed into liquid. In most quantities, potassium chloride is non-toxic to humans. Because potassium is such a valuable mineral in plant growth, much of this substance is used for making fertilizers. In humans, it can be utilized as a nutritional supplement to prevent or treat hypokalemia, which is a form of potassium deficiency. In higher doses, however, this substance can cause cardiac arrest, which makes it an ideal addition to lethal injection mixtures. Gloves should be worn when handling this substance to prevent any skin irritation, as well as ensure that there is no contamination. Potassium chloride should be stored in a cool, dry area, but it is not flammable.