Electrolytes

What it is

Electrolytes are minerals — chiefly sodium, plus potassium, magnesium and others — that carry the electrical signals behind muscle contraction and fluid balance. You lose them, mainly sodium, in sweat.

What the evidence shows

Replacing heavy sweat losses in prolonged exercise. Well-supported· human data This is the legitimate, well-established use: during long, hot or very sweaty sessions, replacing sodium (with fluid) supports performance and helps prevent the dangerous dilution of blood sodium that plain water alone can cause.

A daily electrolyte drink for everyone. Marketing claim The booming "electrolytes for daily wellness" trend is largely marketing. A normal diet already provides plenty for everyday life; most people don't need to add more.

Curing fatigue, brain fog or hangovers. Marketing claim Not supported as specific, reliable effects.

Who it suits

Endurance athletes and anyone doing prolonged or hot, sweaty exercise. For a short gym session or a normal day, water and food usually cover it.

Practical notes

The key electrolyte to replace is sodium, roughly in proportion to how much you sweat and for how long. Read the safety box — most people already eat ample sodium, and those with high blood pressure shouldn't pile on more without reason. Work out fluid needs with the water intake calculator.

Sources

PubMed: sodium / electrolyte replacement, hydration and endurance-exercise performance

Frequently asked questions

Do I need an electrolyte drink every day?

For most people, no. A normal diet supplies enough electrolytes. They earn their keep during long, hot or very sweaty sessions where you lose meaningful sodium — not as an everyday wellness drink.

When do electrolytes actually matter?

During prolonged endurance exercise (roughly beyond 60–90 minutes), heavy sweating, or in the heat, where replacing sodium (and fluid) supports performance and safety.

Isn't more sodium bad for me?

For athletes losing lots in sweat, replacing it is sensible. But most people already eat plenty of sodium, and those with high blood pressure shouldn't add more without a reason.