Potassium (K)
An adult contains around 150 grams of potassium with 98% inside the cells. Potassium works in synergy with sodium, which is primarily found outside the cells in the tissue fluids. The potassium-sodium distribution is essential for the so-called electrolyte balance of cells, and this is crucial for the cellular uptake of nutrients, for the ability of cells to get rid of waste products, and for the maintenance of essential fluid balances. The kidneys regulate the body's potassium levels and they must always be in balance with sodium. A major sodium source is table salt (sodium chloride). Excessive consumption of sodium may result in a potassium deficiency.