Electrolytes: Who Actually Needs Them and What to Look For

When plain water is enough

For sessions under an hour at moderate intensity in a temperate environment, water plus a normal diet covers your needs. Food supplies far more sodium and potassium than most people realize.

The exception is not intensity but sweat volume and duration.

When electrolytes genuinely help

Long sessions, hot environments, heavy sweaters, fasted morning training, endurance events and illness involving fluid loss are the real use cases.

Low-carbohydrate dieters also lose sodium faster and often feel notably better with deliberate replacement.

• Training longer than 60–75 minutes
• Heat, humidity or visible salt residue on skin and clothing
• Fasted or early-morning training
• Low-carb or ketogenic eating
• Recovering from illness with fluid loss

Reading the label

Sodium is the electrolyte that matters most and the one under-dosed in cheap products — look for 300–1000 mg per serving depending on your sweat rate. Potassium and magnesium are secondary but useful.

Skip products where sugar is the first ingredient unless you specifically want the carbohydrate for endurance fueling.

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