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Major mineral

Sodium

Fluid balance, nerve transmission, muscle contraction, blood volume

Essential nutrient

Reference intakes (RDA or AI) are set by the National Academies of Sciences, Engineering, and Medicine. Deficiency thresholds come from clinical and WHO guidance.

At a glance

Women, 19-50

1,500 mg (AI)

Men, 19-50

1,500 mg (AI)

Upper limit (adults)

2,300 mg/day (Chronic Disease Risk Reduction level)

How common is deficiency?

Dietary deficiency is UNCOMMON (excess intake is common); hyponatremia usually from illness, drugs or overhydration

Food sources

Animal sources

Naturally in meat, fish, eggs, milk; mostly from processed foods and table salt

Plant sources

Naturally low in plants; added via salt, sauces, pickled foods, bread, canned goods

Deficiency and testing

Signs of deficiency

Hyponatremia: headache, nausea, confusion, muscle cramps, fatigue, seizures, coma (severe)

Who is at higher risk

Endurance athletes (overhydration), SIADH, heart/liver/kidney failure, thiazide diuretics, adrenal insufficiency, severe vomiting/diarrhea

How it is tested

Serum sodium; serum and urine osmolality; urine sodium; 24-h urinary sodium (to estimate intake)

Cut-offs

Serum Na <135 mmol/L = hyponatremia; <125 mmol/L = severe

Symptoms are not specific. Only a clinician with the right tests can tell whether you are deficient.

Supplement forms

Common forms

oral rehydration solution (glucose-sodium), electrolyte powders/tablets, salt tablets, sodium bicarbonate, IV saline (clinical).

More effective

oral rehydration solution (WHO formula) for diarrhea or heavy sweat loss; sodium-containing sports drinks or salted foods for long endurance exercise; medical treatment for hyponatremia.

Less effective

plain water alone during heavy sweat loss (can worsen hyponatremia); salt tablets as routine (most people already exceed the intake limit); sugary drinks with little sodium for rehydration.

Safety, interactions and halal notes

Safety and interactions

Upper limit for adults: 2,300 mg/day (Chronic Disease Risk Reduction level). Going above the upper limit over time can cause harm, so check labels and talk to a clinician before high-dose supplements.

Halal note

The nutrient itself is not a halal question. For supplements, check the delivery form: gelatin (pork or non-halal bovine), capsule shells, glycerin, and alcohol-based carriers need halal certification. Ask for the halal certificate, not just a label claim. This is general guidance, not a certification.

Frequently asked questions

How much Sodium do adults need per day?

Women 19-50: 1,500 mg (AI). Men 19-50: 1,500 mg (AI). Upper limit: 2,300 mg/day (Chronic Disease Risk Reduction level). Needs change with age, pregnancy and health conditions.

What are the signs of Sodium deficiency?

Hyponatremia: headache, nausea, confusion, muscle cramps, fatigue, seizures, coma (severe). These signs are not specific, so only a clinician with the right tests can confirm a deficiency.

What are the best food sources of Sodium?

Animal sources: Naturally in meat, fish, eggs, milk; mostly from processed foods and table salt. Plant sources: Naturally low in plants; added via salt, sauces, pickled foods, bread, canned goods.

Which form of Sodium supplement is best?

oral rehydration solution (WHO formula) for diarrhea or heavy sweat loss; sodium-containing sports drinks or salted foods for long endurance exercise; medical treatment for hyponatremia.

Sources

National Academies: Dietary Reference Intakes

← Back to the full nutrient guide

This page is for education only and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. Supplements are not intended to diagnose, treat, cure or prevent any disease. Talk to a qualified clinician before starting a supplement, especially if you are pregnant, breastfeeding, take medicine or have a medical condition. Daily needs are US reference intakes for adults 19-50.

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