Sodium chloride is an electrolyte supplement. Sodium and chloride are important electrolytes in the body, mainly present in extracellular fluid, and play a very important role in maintaining normal blood and extracellular fluid volume and osmotic pressure. The normal serum sodium concentration is 135-145mmol/L, accounting for 92% of plasma cations and 90% of total osmotic pressure, so the amount of plasma sodium plays a decisive role in osmotic pressure. The normal serum chloride concentration is 98-106mmol/L. Sodium and chloride ions in the human body are mainly regulated by the hypothalamus, posterior pituitary and kidneys to maintain the stability of body fluid volume and osmotic pressure.

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