Exercise- Related Function:Maintenance of normal fluid balance on either side of cell walls; normal growth; stimulation of nerve impulses for muscular contractions; assists in the conversion of glucose to glycogen; synthesis of muscle protein from amino acids.

Best Food Sources: Potatoes, bananas, fruits and vegetables

Side effects: Heart Disturbances

RDA for adults: No RDA; but a minimum requirement of 16,000-2000 mg and 3500 for active adults