Electrolytes are key to hydration, mainly because they enhance fluid retention. “Having more electrolytes can trigger more efficient fluid uptake from the gut,” says Kim Barrett, a gastrointestinal ...

Magnesium, potassium, or sodium? Learn what each electrolyte does, signs of low levels, and when a supplement may help.

Optimal ranges are set at different levels for each electrolyte, and levels can be measured with a blood test. If you have an electrolyte imbalance, you either have too much or too little of one or ...