Potassium is found in many foods like meats, fish, fruits and vegetables. It is important for heart, muscle and digestive system function. Signs of potassium deficiency include irregular heartbeat, high blood pressure, muscle weakness and cramps. Sulfur is also essential and is found in cabbage, broccoli and onions. It helps form bones, teeth, cartilage and ligaments. Without enough sulfur, the body cannot manufacture healthy cells, potentially causing illnesses. Nutrients interact in complex ways in the body through chemistry, physiology and other processes.