The number of people in the United States with high potassium levels is extremely low and is generally limited to individuals who take potassium supplements in excess, according to the University of Colorado Extension. Healthy individuals excrete any excess potassium in the urine.
Most Americans do not consume enough potassium, according to the University of Colorado Extension. A doctor should monitor the use of potassium supplements. Potassium toxicity is so rare that the government does not establish a maximum intake level for the mineral. However, in a few individuals with kidney disease who are unable to excrete excess potassium, the mineral becomes toxic, resulting in heart problems or sudden death. Other signs of excess potassium include muscle weakness, stomach pain or irregular heartbeat.