The need for mineral salts in the human body: Calcium , sodium , iron , magnesium , phosphorus , iron, etc. Mineral salts. Among them, calcium helps in formation of teeth and bones , blood clotting and proper functioning of nervous system. Phosphorus forms phospholipids , forming teeth and bones. Iron helps in the formation of red blood cells , enzymes or enzymes. Iodine helps in proper functioning of thyroid gland and metabolism. Most of the body's cells and body fluids need sodium. Potassium plays a role in muscle contraction.