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.

Want the outcome before the arithmetic? The reason check opens any registry entry on this page with its trial result first, then compares your daily intake with the studied amount.

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.