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Electrolytes: Uses, Benefits, Dosage & Safety

Last updated: August 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy

Written by FactoWiki Research Team · Reviewed by Supplement Research Editor

Last reviewed: August 2026 · Sources checked: PubMed, NIH, MedlinePlus, NCCIH, FDA

Quick summary

Electrolytes are the charged minerals that regulate fluid balance, nerve signalling and muscle contraction — principally sodium, potassium, magnesium, calcium and chloride. Supplementation genuinely matters during prolonged sweating and is largely unnecessary otherwise.

What is Electrolytes?

Sodium, potassium, chloride, magnesium, calcium and phosphate. Sodium is the main one lost in sweat, at roughly 800–2,000 mg per litre depending on the individual and heat acclimatisation. Commercial electrolyte products vary enormously in sodium content, from token amounts to over 1,000 mg per serving.

What Electrolytes is commonly used for

Endurance exercise over roughly 90 minutes, heavy sweating, heat exposure, illness with vomiting or diarrhoea, and low-carbohydrate or ketogenic diets where sodium and potassium losses increase.

How Electrolytes works

Sodium maintains extracellular fluid volume and drives fluid absorption in the gut — which is why oral rehydration solutions contain both sodium and glucose. Potassium governs intracellular fluid and cardiac rhythm. Magnesium and calcium mediate muscle contraction and relaxation.

What the evidence says

Each claim below is tied to the specific study behind it, rather than to a general reading list.

Typical dosage used in studies

Highly situational. For exercise over 90 minutes in heat, 300–600 mg sodium per hour is a reasonable starting range. For ordinary daily life, food supplies enough. Hyponatraemia in endurance athletes comes from drinking too much plain water, not from too little supplementation.

Side effects and safety

Safe for most people. The genuine risk is at the extremes: excessive sodium matters for people with hypertension or heart failure, and potassium supplementation can be dangerous in kidney disease or alongside ACE inhibitors, ARBs or potassium-sparing diuretics.

Medication interactions and who should avoid Electrolytes

Medication & safety check

Potassium is the one to be careful with. Combined with ACE inhibitors, ARBs, spironolactone or in reduced kidney function, supplemental potassium can cause dangerous hyperkalaemia. Sodium matters for anyone on blood-pressure treatment or with heart failure.

General information, not personal medical advice. If you take any medication, confirm it is safe to combine with Electrolytes with your doctor or pharmacist first.

Sources & further reading

The claim-level citations above are drawn from these sources:

Frequently asked questions

Do I need electrolytes for a normal workout?

For under an hour in temperate conditions, almost certainly not. Water and a normal diet cover it.

Are they useful on a keto diet?

Plausibly yes. Lower insulin increases renal sodium excretion, and the fatigue and headache of the first weeks often responds to sodium.

Can I just use salt?

For sodium, essentially yes, and far more cheaply. Commercial products add potassium and magnesium and convenience.

Where you'll find Electrolytes

Electrolytes appears in Hydration & Performance formulas. Browse the supplement guides to see the products we review, each with a full breakdown of formula, pricing and safety.

Related ingredients to explore

Ingredients often studied or formulated alongside Electrolytes.

MagnesiumMagnesium is an essential mineral involved in hundreds of body processes, including nerve and muscle function, energy…Open →TaurineTaurine is an amino acid involved in heart, muscle and nervous-system function. It's very safe and has some…Open →

General information, not medical advice.