Is a 99 mg potassium supplement safe?
99 milligrams of potassium has no set upper limit. Adults need an adequate intake of 3,400 milligrams for men and 2,600 milligrams for women.
General information, not medical advice. Check with a doctor or pharmacist before taking a supplement, especially if you are pregnant or breastfeeding, take any medicine, or are under 18.
In the UK
99 milligrams of potassium is within the NHS guidance of 3,700 milligrams a day from supplements. In the UK, adults need 3,500 milligrams a day.
The figures
| US (NIH) | UK (NHS) | |
|---|---|---|
| Amount checked | 99 mg | |
| Answer | No upper limit set | Within NHS guidance |
| Compared with | No upper limit has been set for potassium in healthy people. | 3,700 milligrams a day from supplements |
| Share of the limit | No limit to compare | 3% of the limit |
| Adults need | An adequate intake of 3,400 milligrams for men and 2,600 milligrams for women | 3,500 milligrams a day |
Good to know
- Most supplements carry 99 milligrams or less, because larger potassium chloride doses in pill form have been linked to gut damage. People with kidney problems or on some blood pressure medicines should check with a doctor first.
Quick answers
- Is a 99 mg potassium supplement safe?
- 99 milligrams of potassium has no set upper limit. Adults need an adequate intake of 3,400 milligrams for men and 2,600 milligrams for women.
- What does the NHS say about 99 mg of potassium?
- 99 milligrams of potassium is within the NHS guidance of 3,700 milligrams a day from supplements. In the UK, adults need 3,500 milligrams a day.
- What is the upper limit for potassium?
- US: No upper limit has been set for potassium in healthy people. UK (NHS): 3,700 milligrams a day from supplements.
Sources
- NIH Office of Dietary Supplements fact sheet
https://ods.od.nih.gov/factsheets/Potassium-HealthProfessional/ - NHS vitamins and minerals guidance
https://www.nhs.uk/conditions/vitamins-and-minerals/others/
Ask Supplement Check yourself
Type any amount of a vitamin, mineral or supplement, or a whole routine, and see how it compares with the adult limits. Open Supplement Check, free, no sign-up.
In Claude or any app that takes MCP connectors, add https://goodturn-mcp.pages.dev/supplementcheck/mcp and ask: “Is a 99 mg potassium supplement safe?”