Life evolved in the sea – a wonderful balanced electrolyte solution of sodium (Na+), potassium (K+), calcium (Ca++) and magnesium (Mg++) with chlorine (Cl–) and sulfate. Although the sea has become saltier (higher concentrations of sodium chloride) than it is thought to have been historically, our bodies still bathe our cells in a very similar solution that quite closely mimics seawater, just with less sodium and chloride.