what electrolytes are essential to health
By Dr Ananya Mandal, MD. Electrolytes are essential substances in the body required for cell function and cell signalling. In the human body, the main electrolytes are: 1  Sodium (Na+). 2  Potassium (K+). 3  Calcium (Ca2+). 4  Magnesium (Mg2+). 5  Chloride (Clâ). 6  Hydrogen phosphate (HPO42â). 7  Hydrogen carbonate (HCO3â).