Potassium Chloride is a natural form of mineral that is found within many foods. It is something that is definitely needed for various functions of the human body. One of the most vital of all functions is the very beating of one's own heart. This naturally occurring compound is comprised of potassium and chlorine. Its chemical symbol is KCI and it easily dissolved by both humans and plants. Potassium chloride is vital for excellent nerve conduction, muscle contraction, and also kidney function.