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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).
Coconut water has five electrolytes your body needs: 1  Potassium: The most important positive ion (cation) inside your cells; potassium regulates heartbeat and muscle function. 2  Sodium: The most important positive ion in fluid outside your cells, and also the one most depleted with exercise, as you lose sodium through sweat and urine.