Potassium

non-nutrient/non-botanicalpotassium atom

What is it

Potassium is an essential mineral and major intracellular electrolyte that supports nerve transmission, muscle contraction, heart rhythm, and blood pressure regulation. Most adults consume less than the recommended amount.

How it works

Potassium is the main cation inside cells. The sodium-potassium pump maintains the gradient between potassium-rich intracellular fluid and sodium-rich extracellular fluid. This gradient is essential for nerve impulses, muscle contraction (including the heartbeat), and fluid balance. The kidneys regulate potassium balance precisely by adjusting urinary excretion. Adequate potassium intake reduces blood pressure both by promoting sodium loss and through direct vasodilation. The body cannot store potassium effectively, so consistent dietary intake matters more than periodic large doses.

Evidence for 4 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Blood pressure reduction

Grade A

Strong evidence

Higher dietary potassium reliably reduces blood pressure, especially in people with hypertension and high sodium intake.

Stroke prevention

Grade B

Good evidence

Higher potassium intake is associated with reduced stroke risk, likely through blood pressure and other vascular effects.

Kidney stone prevention

Grade B

Good evidence

Prescription potassium citrate prevents calcium oxalate and uric acid stones by alkalinizing urine.

Bone density

Grade C

Moderate evidence

Diets high in potassium from fruits and vegetables are linked to better bone mineral density.

Dosage

The Adequate Intake (AI) is 3,400 mg per day for adult men and 2,600 mg for women. Most adults fall short. Over-the-counter potassium supplements are limited to 99 mg per dose; higher doses require prescription due to risk of hyperkalemia.

When and how to take it

Spread potassium-rich foods through the day rather than consuming a huge dose at once. Prescription potassium chloride is typically divided into multiple doses with food to reduce stomach upset. Over-the-counter supplements (99 mg) provide minimal contribution and timing matters little.

Food sources

Food	Amount	%DV
Potato (baked with skin)	926 mg	20%
Sweet potato (baked)	542 mg	12%
Beans (kidney, canned), 1/2 cup	353 mg	8%
Banana, 1 medium	422 mg	9%
Salmon, 3 oz	475 mg	10%
Avocado, 1/2 fruit	487 mg	10%
Yogurt, 1 cup	380 mg	8%

Safety

Hyperkalemia is potentially fatal, causing cardiac arrhythmias. Risk is highest in people with kidney disease, those on ACE inhibitors, ARBs, potassium-sparing diuretics, or NSAIDs, and those with adrenal insufficiency. Food-source potassium in healthy people is safe. Salt substitutes (potassium chloride) can deliver large amounts of potassium quickly.

Who should be cautious

People with chronic kidney disease, adrenal insufficiency, or taking potassium-affecting medications should not supplement without medical guidance. Older adults on multiple medications are at higher risk. Pregnant women have the same AI as non-pregnant women in their age group.

Interactions

Major interactions with ACE inhibitors, ARBs, potassium-sparing diuretics, and NSAIDs — all raise potassium. Loop and thiazide diuretics lower potassium. Digoxin toxicity is potassium-sensitive. Some heparin formulations affect potassium.

Frequently asked questions

How much potassium do I need?⌄

Adequate Intake is 3,400 mg for men and 2,600 mg for women. Most adults get less than this — eating more fruits, vegetables, beans, and fish helps.

Are potassium supplements safe?⌄

Over-the-counter doses (99 mg) are safe for most people. High-dose prescription potassium can cause hyperkalemia and requires medical supervision.

Can I use a salt substitute?⌄

Many salt substitutes are potassium chloride. Useful for reducing sodium but talk to your doctor if you have kidney disease or take medications that raise potassium.

What foods have the most potassium?⌄

Potatoes, sweet potatoes, beans, salmon, avocados, leafy greens, yogurt, and bananas are good sources. Spread them across meals.

Track Potassium with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.