Potassium

Potassium is the third most abundant mineral in the body and its one of the most interesting as once its inside your body it functions as an electrolyte. What that means is once it is in water it can conduct electricity. This is important as up to sixty percent of an adult body is composed of water1. The human body uses electricity for muscle contractions, nerve signals, fluid balancing and other body processes.
As an example, potassium helps activate the nerve impulses that control your heartbeat, reflexes, and every muscle you use. Lower levels of potassium can cause muscle weakness and, in extreme cases, may cause an irregular heartbeat or respiratory weakness.