How much potassium you need per day by age and sex

Most healthy adults need between 2,300 and 3,400 mg of potassium per day, depending on age and sex, according to the NIH Office of Dietary Supplements. Because a formal Recommended Dietary Allowance has not been set, these figures are expressed as Adequate Intakes (AI), meaning they reflect the best available evidence rather than a precise requirement confirmed by controlled trials.

Why potassium matters

Potassium is the principal positively charged ion inside your cells. The NIH Office of Dietary Supplements identifies three core physiological roles, each supported by strong evidence:

• Maintaining intracellular fluid volume and normal cell tonicity, working in balance with sodium, which governs fluid volume outside the cell.
• Sustaining the transmembrane electrochemical gradient through the sodium-potassium ATPase pump, a process every living cell depends on.
• Supporting proper nerve transmission and muscle signaling, including the contractions of the heart.

These are established physiological functions, not marketing claims. Potassium from food is not a treatment for any condition.

Daily potassium targets by age and sex

The values below come directly from the NIH Office of Dietary Supplements and the National Academies of Sciences, Engineering, and Medicine Dietary Reference Intakes report. All figures are Adequate Intakes.

Infants

• 0 to 6 months: 400 mg per day
• 7 to 12 months: 860 mg per day

Children

• 1 to 3 years: 2,000 mg per day
• 4 to 8 years: 2,300 mg per day
• 9 to 13 years (boys): 2,500 mg per day
• 9 to 13 years (girls): 2,300 mg per day

Adolescents

• 14 to 18 years (males): 3,000 mg per day
• 14 to 18 years (females): 2,300 mg per day

Adults

• 19 to 50 years (men): 3,400 mg per day
• 19 to 50 years (women): 2,600 mg per day
• 51 years and older (men): 3,400 mg per day
• 51 years and older (women): 2,600 mg per day

Pregnancy and lactation

• Pregnant teens (14 to 18): 2,600 mg per day
• Pregnant adults (19 to 50): 2,900 mg per day
• Breastfeeding teens (14 to 18): 2,500 mg per day
• Breastfeeding adults (19 to 50): 2,800 mg per day

No Tolerable Upper Intake Level (UL) has been established for potassium from food in healthy people. The NIH notes that high dietary intake does not carry a known risk for individuals with normal kidney function.

Getting potassium from food

Whole foods are the most practical and safest way to meet these targets. Potassium is found in a wide range of everyday foods, including cooked beans and lentils, baked potatoes, leafy greens such as spinach and Swiss chard, bananas, oranges and orange juice, dairy products, fish, and nuts and seeds. Eating a varied diet that includes fruits, vegetables, and legumes makes it straightforward for most healthy adults to approach the AI without counting milligrams.

What the research shows, with honest evidence grades

The NIH Office of Dietary Supplements grades the evidence behind potassium's proposed health benefits as follows:

• Strong evidence: Potassium is required for maintaining intracellular fluid volume, transmembrane electrochemical gradients, nerve transmission, muscle contraction, and normal kidney function.
• Moderate evidence: Potassium supplementation lowers blood pressure, most clearly in adults who already have hypertension.
• Limited evidence: Higher potassium intake is associated with lower stroke risk. Potassium in the form of potassium citrate reduces urinary calcium and the recurrence of calcium kidney stones. Dietary potassium may support bone health.
• Insufficient evidence: Whether potassium intake improves blood glucose control or reduces type 2 diabetes risk is not yet established.

Grading evidence honestly means acknowledging that limited or insufficient does not mean disproven. It means the research is not yet strong enough to draw firm conclusions.

Safety and who should be cautious

For healthy people with normal kidney function, potassium from food is considered safe at any reasonable dietary intake, and no upper limit has been set. Potassium supplements are a different matter. They may cause minor gastrointestinal side effects such as nausea or stomach discomfort, particularly when taken without food.

More importantly, people with chronic kidney disease or any condition that impairs potassium excretion can develop hyperkalemia, a dangerous elevation of potassium in the blood, even at intakes that would be harmless for someone with healthy kidneys. If you have kidney disease, talk to your doctor before changing your potassium intake in any direction.

Potassium-containing salt substitutes deserve a specific mention. They can deliver roughly 440 to 2,800 mg of potassium per teaspoon, according to the NIH, and can meaningfully raise hyperkalemia risk in people with kidney disease or those taking potassium-retaining medications.

Drug interactions to know

Several common medications change how your body handles potassium. Always talk to your doctor or pharmacist before combining potassium supplements with any prescription drug.

• ACE inhibitors (for example, benazepril) and angiotensin receptor blockers or ARBs (for example, losartan): these reduce urinary potassium excretion and can raise potassium to dangerous levels, especially in people who also have impaired kidney function.
• Potassium-sparing diuretics (for example, amiloride or spironolactone): these also reduce potassium excretion and carry a hyperkalemia risk, particularly with kidney impairment.
• Loop diuretics (for example, furosemide) and thiazide diuretics (for example, chlorothiazide): these increase potassium excretion and can lead to low potassium levels. Monitoring and supplementation may be warranted, under medical supervision.

Should you take a potassium supplement?

The figures in this guide are population reference values. They are not personal prescriptions. Whether a supplement is appropriate for you depends on your diet, kidney function, medications, and overall health, none of which a general reference guide can assess. Please consult a clinician or pharmacist for personal dosing guidance.

Potassium supplements, like all dietary supplements, are not intended to diagnose, treat, cure, or prevent any disease, and these statements have not been evaluated by the FDA.

Sources

• NIH Office of Dietary Supplements, Potassium Fact Sheet for Health Professionals: https://ods.od.nih.gov/factsheets/Potassium-HealthProfessional/
• NIH Office of Dietary Supplements, Potassium Fact Sheet for Consumers: https://ods.od.nih.gov/factsheets/Potassium-Consumer/
• National Academies of Sciences, Engineering, and Medicine, Dietary Reference Intakes for Sodium and Potassium: https://www.nationalacademies.org/our-work/dietary-reference-intakes-for-sodium-and-potassium