Educational dose math only — not medical advice, not a product recommendation, and not a pass/fail on whether a supplement will work for you.
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The 99 mg elemental potassium limit per over-the-counter pill in the US exists because higher single-pill doses can injure the gut lining and because a bottle of high-dose pills is a hyperkalemia hazard in the wrong kidney. This entry is a ceiling, not a trial floor: potassium has no studied supplement dose, because its risk profile runs the other way.

Educational only — not medical advice. Disclaimer.

NIH DSLD market slice

Median475 mg
Products362
Below31%

Bulk CSV dump 16 January 2026 · label entries through 2025. Disclosed amounts only — proprietary blends without gram weights excluded.

Trial floors

Primary

US OTC pill limit (FDA) · 99 mg over ongoing (high evidence · how we grade this) — The 99 mg elemental potassium limit per over-the-counter pill in the US exists because higher single-pill doses can injure the gut lining and because a bottle of high-dose pills is a hyperkalemia hazard in the wrong kidney. This entry is a ceiling, not a trial floor: potassium has no studied supplement dose, because its risk profile runs the other way.

Safety red flags

  • On an ACE inhibitor, ARB, spironolactone, potassium-sparing diuretic, or with reduced kidney function: potassium-containing powders and tablets only with your prescriber in the loop.
  • Muscle weakness, palpitations, or new confusion on potassium supplements warrants prompt medical contact.

Label reading notes

  • Adequate intake is 2,600 mg per day for women and 3,400 mg for men (NASEM 2019 dietary reference intakes). One 99 mg pill covers about 3-4% of it.
  • Food is the default source: a banana is roughly 420 mg, a potato more, legumes and dairy contribute regularly.
  • A "potassium tablet" on the shelf is a rounding error against the food target, not a strategy for reaching 3,400 mg.
  • Hyperkalemia risk rises with chronic kidney disease, ACE inhibitors, ARBs, spironolactone, and uncompensated diabetes; those pairings are tracked in our interaction base.