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All supplements

Minerals & electrolytes

Potassium

A mineral and electrolyte from fruit, vegetables and beans. Your body needs it for muscles, nerves and normal blood pressure. US pills hold only up to 99 mg.

84 products from US online stores, sorted by what 100 mg of potassium costs – not by the price per pack.

0.34¢Lowest cost
per 100 mg potassium

  • Prices checked Nov 1, 2026, US
  • No paid placements

What does 100 mg mean?

potassium per serving in most of the products we checked
99–363 mgpotassium per serving in most of the products we checked
  • 100 mg is about one serving: half of the 84 products we checked have up to 99 mg per serving, the other half more.
  • 100 mg is less than the 2,600–3,400 mg a day that’s considered adequate for adults, from food and supplements together (NIH (opens in a new tab)).

We compare by 100 mg only so products line up – it’s not a recommendation. Not medical advice.

Where products miss quality points

How the 84 products score

  • Very good 90+: 3
  • Good 75+: 81
  • Fair 60+: 0
  • Low under 60: 0
have no seal from an independent testing program
96%have no seal from an independent testing program10 of 30 testing points for GMP, 15 for the 13 whose label says “third-party tested”

The full 30 testing points need an independent test. Every supplement sold in the US is made under the FDA’s GMP rules – the maker checks its own products, which gives 10 points. A seal from a testing program like NSF, USP or Informed Choice means a lab outside the company checks that what’s inside matches the label. Most brands don’t take part. That doesn’t make a product bad – without a seal, a clean product still gets up to 80.

We find seals on the label and in NSF’s public lists. USP and Informed Choice don’t let us search their lists automatically, so a seal that’s only in their lists can be missing. How the score works

Pack size

Compare packs of a similar size.

Pack size

All sizes in one list can affect the results – big packs usually cost less per 100 mg. Pick a size above to compare packs that are alike.

Sort by

84 products · cheapest per 100 mg potassium first

  1. Rank 1

    Vitamatic

    Potassium Chloride Powder Pouch

    Powder

    80Good qualityCountry not stated
    0.34¢

    per 100 mg

    Lowest

    Pack
    $16.991 kg (2.2 lb)1,429 servings
    Potassium per serving
    350 mgin 0.7 g
    Pack lasts
    5,000 daysif you take 100 mg a day
    vitamaticusa.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  2. Rank 2

    Micro Ingredients

    Potassium Chloride

    Powder

    80Good qualityCountry not stated
    0.44¢

    per 100 mg

    30% more

    Pack
    $22.991,428 servings
    Potassium per serving
    365 mg
    Pack lasts
    5,212 daysif you take 100 mg a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  3. Rank 3

    Nutricost

    Potassium Chloride, Unflavored

    Powder

    85Good qualityPacked in USA
    0.47¢

    per 100 mg

    37% more

    Pack
    $23.951 kg (2.2 lb)1,429 servings
    Potassium per serving
    360 mgin 0.7 g
    Pack lasts
    5,142 daysif you take 100 mg a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  4. Rank 4

    BulkSupplements

    Potassium Chloride Powder

    Powder

    80Good qualityCountry not stated
    0.51¢

    per 100 mg

    51% more

    Pack
    $26.975,000 servings
    Potassium per serving
    105 mg
    Pack lasts
    5,250 daysif you take 100 mg a day
    bulksupplements.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  5. Rank 5

    Nutricost

    Potassium Chloride Powder

    Powder

    85Good qualityCountry not stated
    0.52¢

    per 100 mg

    53% more

    Pack
    $26.97992 g (2.2 lb)1,417 servings
    Potassium per serving
    365 mgin 0.7 g
    Pack lasts
    5,172 daysif you take 100 mg a day
    nutricost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  6. Rank 6

    NOW Foods

    Potassium Chloride Powder

    Powder

    80Good qualityPacked in USA
    0.57¢

    per 100 mg

    68% more

    Pack
    $6.72227 g (8 oz)324 servings
    Potassium per serving
    363 mgin 0.7 g
    Pack lasts
    1,177 daysif you take 100 mg a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  7. Rank 7

    Micro Ingredients

    Potassium Citrate

    Powder

    80Good qualityCountry not stated
    0.68¢

    per 100 mg

    99% more

    Pack
    $25.953,875 servings
    Potassium per serving
    99 mg
    Pack lasts
    3,836 daysif you take 100 mg a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  8. Rank 8

    Nutricost

    Potassium Bicarbonate, Unflavored

    Powder

    85Good qualityPacked in USA
    0.72¢

    per 100 mg

    113% more

    Pack
    $24.95907 g (2 lb)698 servings
    Potassium per serving
    494 mgin 1.3 g
    Pack lasts
    3,446 daysif you take 100 mg a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  9. Rank 9

    Nutricost

    Potassium Bicarbonate Powder

    Powder

    85Good qualityCountry not stated
    0.81¢

    per 100 mg

    139% more

    Pack
    $27.97907 g (2 lb)698 servings
    Potassium per serving
    494 mgin 1.3 g
    Pack lasts
    3,446 daysif you take 100 mg a day
    nutricost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  10. Rank 10

    BulkSupplements

    Potassium Chloride Powder

    Powder

    80Good qualityCountry not stated
    0.95¢

    per 100 mg

    180% more

    Pack
    $24.972,500 servings
    Potassium per serving
    105 mg
    Pack lasts
    2,625 daysif you take 100 mg a day
    bulksupplements.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  11. Rank 11

    Nutricost

    Potassium Bicarbonate, Unflavored

    Powder

    85Good qualityPacked in USA
    1¢

    per 100 mg

    206% more

    Pack
    $17.95454 g (1 lb)349 servings
    Potassium per serving
    494 mgin 1.3 g
    Pack lasts
    1,725 daysif you take 100 mg a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  12. Rank 12

    NOW Foods

    Potassium Citrate, Pure Powder

    Powder

    80Good qualityPacked in USA
    1.1¢

    per 100 mg

    215% more

    Pack
    $11.63340 g (12 oz)243 servings
    Potassium per serving
    448 mgin 1.4 g
    Pack lasts
    1,088 daysif you take 100 mg a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  13. Rank 13

    Nutricost

    Potassium Bicarbonate Powder

    Powder

    85Good qualityCountry not stated
    1.2¢

    per 100 mg

    241% more

    Pack
    $19.97454 g (1 lb)349 servings
    Potassium per serving
    494 mgin 1.3 g
    Pack lasts
    1,725 daysif you take 100 mg a day
    nutricost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  14. Rank 14

    BulkSupplements

    Potassium Gluconate Powder

    Powder

    80Good qualityCountry not stated
    1.9¢

    per 100 mg

    460% more

    Pack
    $31.972,000 servings
    Potassium per serving
    84 mg
    Pack lasts
    1,680 daysif you take 100 mg a day
    bulksupplements.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  15. Rank 15

    Celtic Sea Salt

    Potassium Pink Cave Salt

    Powder

    80Good qualityCountry not stated
    2¢

    per 100 mg

    490% more

    Pack
    $9.58300 g (10.6 oz)200 servings
    Potassium per serving
    239 mgin 1.5 g
    Pack lasts
    478 daysif you take 100 mg a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  16. Rank 16

    Best Naturals

    Potassium Gluconate Powder

    Powder

    80Good qualityMade in USA
    2¢

    per 100 mg

    494% more

    Pack
    $14.99454 g (1 lb)413 servings
    Potassium per serving
    180 mgin 1.1 g
    Pack lasts
    742 daysif you take 100 mg a day
    shopbestnaturals.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  17. Rank 17

    BulkSupplements

    Potassium Bicarbonate Capsules

    Capsules

    80Good qualityCountry not stated
    2.3¢

    per 100 mg

    585% more

    Pack
    $20.96360 capsules180 servings
    Potassium per serving
    500 mgin 2 capsules
    Pack lasts
    360 daysif you take 1 capsule (250 mg) a day
    bulksupplements.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  18. Rank 18

    NOW Foods

    Potassium Gluconate Pure Powder

    Powder

    80Good qualityPacked in USA
    2.5¢

    per 100 mg

    648% more

    Pack
    $18.37454 g (1 lb)413 servings
    Potassium per serving
    175 mgin 1.1 g
    Pack lasts
    722 daysif you take 100 mg a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  19. Rank 19

    Best Naturals

    Potassium Citrate 99 mg

    Tablets

    80Good qualityMade in USA
    2.8¢

    per 100 mg

    732% more

    Pack
    $13.99500 tablets
    Potassium per serving
    99 mgin 1 tablet
    Pack lasts
    250 daysif you take 2 tablets (198 mg) a day
    shopbestnaturals.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  20. Rank 20

    Vitacost

    Potassium Citrate, 99 mg

    Capsules

    80Good qualityCountry not stated
    3.3¢

    per 100 mg

    858% more

    Pack
    $9.67300 capsules
    Potassium per serving
    99 mgin 1 capsule
    Pack lasts
    150 daysif you take 2 capsules (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  21. Rank 21

    BulkSupplements

    Potassium Gluconate Powder

    Powder

    80Good qualityCountry not stated
    3.3¢

    per 100 mg

    880% more

    Pack
    $27.971,000 servings
    Potassium per serving
    84 mg
    Pack lasts
    840 daysif you take 100 mg a day
    bulksupplements.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  22. Rank 22

    Best Naturals

    Potassium Citrate, 99 mg

    Tablets

    80Good qualityMade in USA
    3.5¢

    per 100 mg

    923% more

    Pack
    $17.21500 tablets
    Potassium per serving
    99 mgin 1 tablet
    Pack lasts
    250 daysif you take 2 tablets (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  23. Rank 23

    Vitacost

    Everyday Essentials, Potassium Citrate, 99 mg

    Capsules

    80Good qualityCountry not stated
    3.7¢

    per 100 mg

    997% more

    Pack
    $6.64180 capsules
    Potassium per serving
    99 mgin 1 capsule
    Pack lasts
    90 daysif you take 2 capsules (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  24. Rank 24

    BulkSupplements

    Potassium Chloride Powder

    Powder

    80Good qualityCountry not stated
    3.8¢

    per 100 mg

    1,019% more

    Pack
    $19.97500 servings
    Potassium per serving
    105 mg
    Pack lasts
    525 daysif you take 100 mg a day
    bulksupplements.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  25. Rank 25

    Nutricost

    Potassium, 99 mg

    Capsules

    85Good qualityMade in USA
    4¢

    per 100 mg

    1,086% more

    Pack
    $19.95500 capsules
    Potassium per serving
    99 mgin 1 capsule
    Pack lasts
    250 daysif you take 2 capsules (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  26. Rank 26

    Vitamatic

    Potassium 99mg High Potency

    Tablets

    85Good qualityMade in USA
    4¢

    per 100 mg

    1,088% more

    Pack
    $9.99250 tablets
    Potassium per serving
    99 mgin 1 tablet
    Pack lasts
    125 daysif you take 2 tablets (198 mg) a day
    vitamaticusa.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  27. Rank 27

    Best Naturals

    Potassium Chloride Supplement 99mg - 3rd Party Lab Tested

    Tablets

    80Good qualityMade in USA
    4.3¢

    per 100 mg

    1,163% more

    Pack
    $16.99400 tablets
    Potassium per serving
    99 mgin 1 tablet
    Pack lasts
    200 daysif you take 2 tablets (198 mg) a day
    shopbestnaturals.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  28. Rank 28

    Best Naturals

    Potassium Chloride, 99 mg

    Tablets

    80Good qualityMade in USA
    4.3¢

    per 100 mg

    1,178% more

    Pack
    $17.20400 tablets
    Potassium per serving
    99 mgin 1 tablet
    Pack lasts
    200 daysif you take 2 tablets (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  29. Rank 29

    Nutricost

    Potassium Citrate Capsules

    Capsules

    85Good qualityCountry not stated
    4.4¢

    per 100 mg

    1,206% more

    Pack
    $21.97500 capsules
    Potassium per serving
    99 mgin 1 capsule
    Pack lasts
    250 daysif you take 2 capsules (198 mg) a day
    nutricost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  30. Rank 30

    Best Naturals

    Potassium Gluconate 595 mg

    Tablets

    80Good qualityMade in USA
    4.4¢

    per 100 mg

    1,207% more

    Pack
    $10.99250 tablets
    Potassium per serving
    99 mgin 1 tablet
    Pack lasts
    125 daysif you take 2 tablets (198 mg) a day
    shopbestnaturals.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  31. Rank 31

    Micro Ingredients

    Potassium Citrate, 99 mg

    Capsules

    85Good qualityMade in USA
    4.4¢

    per 100 mg

    1,207% more

    Pack
    $21.99500 capsules
    Potassium per serving
    99 mgin 1 capsule
    Pack lasts
    250 daysif you take 2 capsules (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  32. Rank 32

    Micro Ingredients

    Potassium Citrate 99mg

    Capsules

    85Good qualityCountry not stated
    4.4¢

    per 100 mg

    1,207% more

    Pack
    $21.99500 capsules
    Potassium per serving
    99 mgin 1 capsule
    Pack lasts
    250 daysif you take 2 capsules (198 mg) a day
    microingredients.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  33. Rank 33

    21st Century

    Potassium Gluconate 595 mg

    Tablets

    80Good qualityCountry not stated
    4.6¢

    per 100 mg

    1,248% more

    Pack
    $4.99110 tablets
    Potassium per serving
    99 mgin 1 tablet
    Pack lasts
    55 daysif you take 2 tablets (198 mg) a day
    21stcenturyvitamins.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  34. Rank 34

    Force Factor

    Potassium Citrate, 99 mg

    Capsules

    80Good qualityMade in USA
    4.7¢

    per 100 mg

    1,269% more

    Pack
    $8.29180 capsules
    Potassium per serving
    99 mgin 1 capsule
    Pack lasts
    90 daysif you take 2 capsules (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  35. Rank 35

    NOW Foods

    Potassium Citrate, 99 mg

    Capsules

    80Good qualityCountry not stated
    4.9¢

    per 100 mg

    1,337% more

    Pack
    $8.70180 capsules
    Potassium per serving
    99 mgin 1 capsule
    Pack lasts
    90 daysif you take 2 capsules (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  36. Rank 36

    21st Century

    Potassium Gluconate, 595 mg

    Tablets

    80Good qualityCountry not stated
    5¢

    per 100 mg

    1,384% more

    Pack
    $5.49110 tablets
    Potassium per serving
    99 mgin 1 tablet
    Pack lasts
    55 daysif you take 2 tablets (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  37. Rank 37

    Mason Natural

    Potassium Gluconate

    Tablets

    80Good qualityMade in USA
    5.4¢

    per 100 mg

    1,493% more

    Pack
    $5.36100 tablets
    Potassium per serving
    99 mgin 1 tablet
    Pack lasts
    50 daysif you take 2 tablets (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  38. Rank 38

    NOW Foods

    Potassium Gluconate, 99 mg

    Tablets

    80Good qualityMade in USA
    5.4¢

    per 100 mg

    1,500% more

    Pack
    $13.46250 tablets
    Potassium per serving
    99 mgin 1 tablet
    Pack lasts
    125 daysif you take 2 tablets (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  39. Rank 39

    BulkSupplements

    Potassium Gluconate Powder

    Powder

    80Good qualityCountry not stated
    5.5¢

    per 100 mg

    1,509% more

    Pack
    $22.97500 servings
    Potassium per serving
    84 mg
    Pack lasts
    420 daysif you take 100 mg a day
    bulksupplements.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  40. Rank 40

    Nature's Bounty

    Potassium, 99 mg

    Tablets

    80Good qualityMade in USA
    5.6¢

    per 100 mg

    1,550% more

    Pack
    $5.55100 tablets
    Potassium per serving
    99 mgin 1 tablet
    Pack lasts
    50 daysif you take 2 tablets (198 mg) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

40 of 84 shown

Filters

Good to know

Fact
6,671%more per 100 mg for the most expensive product than for the cheapest.
Fact
732%more per 100 mg for the cheapest tablets than for the cheapest powder.

How we checked: one-time price for each size in the store’s US online shop, before sales tax and shipping, without subscriptions or coupons. Prices change often, so check the store before you buy. More on how we check

The amount we compare by only makes products comparable – it is not a dosage recommendation. Not medical advice.

How we calculate

Cost per dose = price ÷ (servings × amount per serving) × comparison amount. Example: $119.99 for 74 servings with 24 g of protein each is 1,776 g of protein. $119.99 ÷ 1,776 g × 30 g = $2.03 per 30 g of protein.

Found a mistake or a product we should add? Email us