Ions

Sodium (Na⁺): Helps in nerve signals and muscle contractions. 

Potassium (K⁺): Works with sodium to send nerve signals and helps muscles relax. 

Calcium (Ca²⁺): Needed for muscle contractions and helps in nerve signal transmission. 

Chloride (Cl⁻): Balances fluid and helps with nerve function. 

Magnesium (Mg²⁺): Helps with muscle function and is needed for many enzyme reactions.