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

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 ...

Whether you're staying hydrated throughout the day or fueling for activity, these are the best electrolyte powders based on research and insights from experts.