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Major mineral

Potassium

Fluid and electrolyte balance, nerve impulses, muscle contraction, blood pressure control

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

2,600 mg (AI)

Men, 19-50

3,400 mg (AI)

Upper limit (adults)

Not established

How common is deficiency?

Inadequate INTAKE is VERY COMMON; clinical hypokalemia is usually from losses (vomiting, diarrhea, diuretics) rather than diet

Food sources

Animal sources

Salmon, cod, chicken, beef, milk, yogurt

Plant sources

Potatoes (with skin), sweet potato, beans, lentils, spinach, bananas, avocado, tomatoes, oranges, dried apricots, coconut water

Deficiency and testing

Signs of deficiency

Weakness, fatigue, muscle cramps, constipation, palpitations, abnormal heart rhythm, paralysis (severe), higher blood pressure over time

Who is at higher risk

Diuretic users, vomiting/diarrhea, laxative abuse, eating disorders, hyperaldosteronism, magnesium deficiency, excessive sweating

How it is tested

Serum potassium; urine potassium; ECG (U waves, flattened T waves); arterial/venous blood gas

Cut-offs

Serum K <3.5 mmol/L = hypokalemia; <2.5 mmol/L = severe

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

Supplement forms

Common forms

potassium chloride (KCl), potassium citrate, potassium bicarbonate, potassium gluconate, salt substitutes, powders/effervescent, foods.

More effective

potassium-rich foods (best and safest); prescription potassium chloride (extended-release or liquid) for diagnosed hypokalemia; potassium citrate/bicarbonate when alkalinizing is needed (kidney stones, low urinary citrate); KCl salt substitutes lower blood pressure in studies.

Less effective

OTC potassium supplements (US labels limit them to about 99 mg per serving, which is small relative to the 2,600-3,400 mg AI); high doses without supervision (dangerous high potassium in kidney disease or with ACE inhibitors, ARBs, potassium-sparing diuretics).

Safety, interactions and halal notes

Safety and interactions

Upper limit for adults: Not established. 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 Potassium do adults need per day?

Women 19-50: 2,600 mg (AI). Men 19-50: 3,400 mg (AI). Upper limit: Not established. Needs change with age, pregnancy and health conditions.

What are the signs of Potassium deficiency?

Weakness, fatigue, muscle cramps, constipation, palpitations, abnormal heart rhythm, paralysis (severe), higher blood pressure over time. These signs are not specific, so only a clinician with the right tests can confirm a deficiency.

What are the best food sources of Potassium?

Animal sources: Salmon, cod, chicken, beef, milk, yogurt. Plant sources: Potatoes (with skin), sweet potato, beans, lentils, spinach, bananas, avocado, tomatoes, oranges, dried apricots, coconut water.

Which form of Potassium supplement is best?

Sources

← 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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