How Much Potassium Per Day? 2,600 to 3,400 mg, and a Pill Holds 99 mg
Adults need 2,600 mg (women) to 3,400 mg (men) of potassium a day, mostly from food (NIH). Most store-bought potassium pills hold 99 mg or less, about 3% of a man’s daily need (2% of the label’s Daily Value), so food does the real work. Ask your doctor first if you have kidney disease or take an ACE inhibitor, an ARB or a potassium-sparing diuretic.
Best potassium pill to add to your food
- Buy on Amazon for NOW Potassium Citrate 99 mg
Our pick: 99 mg in 1 capsule
NOW Potassium Citrate 99 mg $0.08 a day at NOW’s list price (1 capsule)
99 mg of potassium as citrate in one capsule a day, the usual amount in a store-bought pill. Citrate is one of the forms found in fruits and vegetables (NIH). A 180-capsule bottle lasts six months. It is not on a public testing list; none of the potassium pills we track is.
- Check price on Amazon for Nature’s Bounty Potassium Gluconate 99 mg
You want a smaller bottle
Nature’s Bounty Potassium Gluconate 99 mg
99 mg of potassium as gluconate in one caplet, 100 caplets a bottle. NIH cites a trial where people absorbed about 94% of the potassium in gluconate supplements, about the same as from potatoes.
- Check price on Amazon for Best Naturals Potassium Chloride 99 mg
You want potassium chloride
Best Naturals Potassium Chloride 99 mg
99 mg of potassium as chloride in one tablet, 400 tablets a bottle. Chloride is the form in salt substitutes. The brand says it is lab tested by a third party; it is not on a public testing list.
Cost a day is NOW’s own store price, $14.99 for 180 capsules, read September 16, 2026. All three hold the same 99 mg; the form is the main difference.
Ask your doctor before any potassium pill if this is you. Kidney disease, or a medicine that holds potassium in: ACE inhibitors (such as benazepril), ARBs (such as losartan) or potassium-sparing diuretics (such as spironolactone). These can cause high blood potassium (NIH). Who else should ask first.
A summary of NIH guidance and published research, not medical advice.
How much potassium you actually need
The current Adequate Intake (AI), set by the National Academies in 2019, is 3,400 mg a day for men and 2,600 mg a day for women (NIH; National Academies, PMID 30844154). You will still see the older 4,700 mg figure. It was the earlier target, and it is still the Daily Value that labels use for “% DV.” In 2019 the experts found too little evidence to set a firmer number, so they set the AI from what healthy people actually eat.
On average, Americans fall a little short of even the newer AI. US adults get an average of 3,016 mg (men) and 2,320 mg (women) a day from food (NIH, from the 2013–2014 national survey). Supplements barely move that: among people who take one with potassium, it adds an average of only 87 mg a day (NIH).
| Age | Men | Women | Pregnant | Nursing |
|---|---|---|---|---|
| 1–3 years | 2,000 | 2,000 | – | – |
| 4–8 years | 2,300 | 2,300 | – | – |
| 9–13 years | 2,500 | 2,300 | – | – |
| 14–18 years | 3,000 | 2,300 | 2,600 | 2,500 |
| 19–50 years | 3,400 | 2,600 | 2,900 | 2,800 |
| 51+ years | 3,400 | 2,600 | – | – |
These targets do not apply to people with kidney disease or on medicines that hold potassium in (NIH). Babies: 400 mg (0–6 months), 860 mg (7–12 months).
Note: “below the target” is not the same as “deficient.” Most people who eat below the AI are not clinically deficient. Truly low blood potassium is rare in healthy people with normal kidneys; it usually comes from water pills, vomiting or diarrhea (NIH). If you take a diuretic or another prescription medicine, or have a health condition, ask your doctor before using a potassium product.
Why are potassium supplements capped at 99 mg?
Your target is thousands of milligrams, but most pills say 99 mg. The reason is safety. Slow-release and coated potassium chloride tablets were linked to ulcers, narrowing and even holes in the small intestine (Leijonmarck 1985, PMID 4013604; Grosdidier 1989, PMID 2680333). The FDA ruled some potassium chloride drug products over 99 mg unsafe, and it requires a small-bowel warning on some potassium salts over 99 mg a tablet (21 CFR 201.306). It has not ruled whether supplements over 99 mg need that warning, so most makers simply stop at 99 mg (NIH). It is a drug-safety line, not a statement that 99 mg is what you need.
The label trap: “550 mg” can mean 90 mg
Potassium is always sold bound to another molecule (gluconate, citrate, chloride). The potassium line on the Supplement Facts panel shows the potassium itself (NIH), but the big number on the front of some bottles is the weight of the whole compound. Only part of that weight is potassium:
| Item | Value (%) |
|---|---|
| Potassium chloride (KCl) | ~52% |
| Potassium citrate | ~38% |
| Potassium gluconate | ~17% |
So a “550 mg potassium gluconate” tablet and a “99 mg potassium” tablet give you about the same 90–99 mg of real potassium. When you compare products, read the potassium line and its % Daily Value on the Supplement Facts panel, not the number on the front. (Our best-potassium ranking lists every product by its potassium so you can compare fairly.)
This trap is real but not the norm. Of the 172 labels we read that put a milligram number in the product name, the typical one names the potassium itself. About one in three (33.7%) show a name number at least twice the potassium. Check the panel anyway.
What potassium labels show: most stop at 99 mg
We read 898 potassium labels in the NIH label database (it lists 15,572 potassium labels). That includes 338 products sold as potassium and 534 that mix potassium into an electrolyte drink, multivitamin or greens powder. We counted the two groups apart.
The middle potassium-only product holds 99 mg a serving, and 78.4% hold 99 mg or less. The most common amount is 99 mg. Most brands follow the safety line, so a bigger pill is rare and still far from your daily need.
The mixed products have a middle amount of 117 mg a serving. That is still tiny next to a 3,400 mg daily need.
So how many pills would it actually take?
At 99 mg of potassium per pill, here is the math:
- The average gap to the Adequate Intake is about 280–380 mg (3,400 or 2,600 mg target minus the 3,016 or 2,320 mg average). That is 3–4 pills a day, but a cup of lentils or a baked potato closes it more easily.
- Reaching the older 4,700 mg target from an average woman’s 2,320 mg day, a 2,380 mg gap, would take about 24 pills.
- Getting to 4,700 mg from nothing would take about 47 pills.
Taking 24 or 47 pills a day is not practical, and very large amounts from pills can overwhelm even healthy kidneys (NIH). A potassium pill is a small top-up, not a way to hit your daily number.
What actually raises your potassium: food
Food is where the real potassium is. In healthy people with normal kidneys, potassium from food carries no known risk, because the kidneys flush out the extra (NIH). A banana is not the top source: dried apricots, lentils, squash, prunes and potatoes all have more.
| Food | Potassium | Pills |
|---|---|---|
| Dried apricots, ½ cup | 755 mg | 8 |
| Lentils, cooked, 1 cup | 731 mg | 7 |
| Acorn squash, mashed, 1 cup | 644 mg | 7 |
| Prunes, dried, ½ cup | 635 mg | 6 |
| Raisins, ½ cup | 618 mg | 6 |
| Potato, baked, flesh only, 1 medium | 610 mg | 6 |
| Kidney beans, canned, 1 cup | 607 mg | 6 |
| Orange juice, 1 cup | 496 mg | 5 |
| Banana, 1 medium | 422 mg | 4 |
| Milk, 1%, 1 cup | 366 mg | 4 |
| Spinach, raw, 2 cups | 334 mg | 3 |
| Salmon, Atlantic, farmed, cooked, 3 ounces | 326 mg | 3 |
One cup of cooked lentils gives you about as much potassium as 7 pills. Eating more of these foods is how to raise your potassium; see the potassium evidence on the hub. Electrolyte drinks are not a potassium fix either (see our electrolytes guide).
Ask your doctor first
- Kidney disease, ACE inhibitors, ARBs, potassium-sparing diuretics. All of these slow how fast your body clears potassium and can cause high blood potassium. With kidney disease, ACE inhibitors or potassium-sparing diuretics, even food amounts below the AI can do it (NIH). Ask your doctor or a dietitian how much potassium, from all sources, is right for you.
- Other conditions. High blood potassium can also happen with type 1 diabetes, heart failure, adrenal insufficiency or liver disease (NIH).
- Salt substitutes hold 440–2,800 mg of potassium a teaspoon, far more than a pill. The same people should ask before using them (NIH).
- Water pills that lower potassium, such as furosemide or thiazides, can cause low blood potassium (NIH). If that is why you are looking, your doctor should test it and set the dose.
- Prescription potassium is set and monitored by a doctor and is far above the 99 mg store pill. It is a medical decision, not a self-serve one.
- Everyone else: a 99 mg pill is a modest top-up at best, and it is still worth asking your doctor or pharmacist. Food does far more. No upper limit is set for potassium, but very large doses of pills or salt substitutes can overwhelm even healthy kidneys (NIH).
Frequently asked questions
How much potassium do you need per day?
Adults need 3,400 mg a day (men) or 2,600 mg (women), the 2019 Adequate Intake (NIH). An older target was 4,700 mg, and labels still use 4,700 mg as the Daily Value. On average, US adults fall a bit short from food, but “below the target” is not the same as “deficient.” Ask your doctor before using a potassium product.
Why are potassium supplements limited to 99 mg?
Potassium chloride pills over 99 mg were linked to sores (lesions) in the small bowel. The FDA ruled some of those drug products unsafe and requires a warning on some potassium salts over 99 mg a tablet. So most supplement makers stop at 99 mg (NIH). It is a safety line, not your daily need.
Does a 550 mg potassium gluconate pill give you 550 mg of potassium?
No. That is the weight of the whole gluconate compound; only about 16.7% of it is potassium, so it gives about 90 mg, about the same as a “99 mg” pill. Read the potassium line on the Supplement Facts panel, not the number on the front.
How many potassium pills would it take to meet the daily target?
At 99 mg each, the average gap to the Adequate Intake (about 280–380 mg) is 3–4 pills. Reaching the old 4,700 mg target from an average woman’s 2,320 mg day (a 2,380 mg gap) takes about 24 pills; from nothing, about 47. That many is not practical. Pills are a top-up. Food, or prescription potassium from a doctor for a diagnosed low level, is how you raise intake.
Is there an upper limit for potassium?
No. The National Academies experts did not set one, because healthy kidneys flush out extra potassium (NIH). That changes with kidney disease or a medicine that holds potassium in, such as an ACE inhibitor or a potassium-sparing diuretic. Then even food amounts below the Adequate Intake can push blood potassium too high (NIH).
Can I take potassium with blood pressure medicine?
Ask your doctor first. ACE inhibitors (such as benazepril), ARBs (such as losartan) and potassium-sparing diuretics (such as spironolactone) keep potassium in your body and can cause high blood potassium (NIH). Some other water pills, such as furosemide or thiazides, do the opposite and lower it. Either way, your doctor should set the dose.
Bottom line: get your potassium from food. If you want a small top-up and none of the doctor cases above apply, our pick is NOW Potassium Citrate 99 mg, one capsule a day.
Related guides
- Best Potassium Supplements: every product by its potassium, and who should avoid it
- Electrolytes: what is in the drinks and powders
Sources
- NIH Office of Dietary Supplements. Potassium fact sheet for health professionals (updated June 2, 2022; read October 27, 2026). Adequate Intakes (Table 1), foods (Table 2), Daily Value, the 99 mg limit, intakes, absorption, salt substitutes, health risks, medicine interactions.
- National Academies. Dietary Reference Intakes for Sodium and Potassium. 2019. PMID 30844154
- Cogswell ME, et al. Sodium and potassium intakes among US adults: NHANES. Am J Clin Nutr. 2012. PMID 22854410
- Leijonmarck CE, Räf L. Ulceration of the small intestine due to slow-release potassium chloride tablets. Acta Chir Scand. 1985. PMID 4013604
- Grosdidier J, et al. Stenosing and perforated ulcers of the small intestine related to potassium chloride in enteric-coated tablets (11 cases). Chirurgie. 1989. PMID 2680333
- FDA. 21 CFR 201.306: Potassium salt preparations for oral ingestion.
- USDA FoodData Central: potassium content of foods (the source of NIH Table 2).
- NIH Dietary Supplement Label Database: 898 potassium labels; our analysis. Product amounts: each brand's Supplement Facts label. NOW Foods store price: nowfoods.com, read September 16, 2026. Testing lists searched for all three products.
This page is for information. It is not medical advice.