What is Potassium?
An essential electrolyte critical for heart rhythm and muscle function.
Potassium is crucial for nerve and muscle function, especially the heart. Most people do not get enough from diet. Food sources are preferred over supplements due to safety margins. Supplement forms are limited to 99mg per serving by regulation.
What the evidence says
The overall evidence grade for Potassium is A (strong — consistent, high-quality human evidence (systematic reviews, well-powered RCTs)). Essential electrolyte. Food-first approach strongly recommended.
Specific findings with supporting evidence:
- Essential for heart and muscle function. Evidence grade A.
- Most people are deficient. Evidence grade B.
Best-supported outcomes:
- Blood pressure support.
- Muscle function.
- Electrolyte balance.
Where marketing outpaces evidence:
- Marketing often overstates: Supplements are as good as food.
Dose and timing
The typical effective dose for Potassium is 99 mg per capsule. Regulation limits supplement dose; get rest from food.
Take it in the morning and afternoon with food. Spread throughout day; food sources preferred.
Who it's for, and who should skip it
Most relevant for:
- Athletes with high sweat losses.
- Those on diuretics.
- People with low dietary intake.
Not appropriate for:
- Those with kidney disease.
- People on potassium-sparing medications.
Safety and cautions
Important: Kidney disease. Can cause dangerous hyperkalemia in kidney impairment. Important: Medications. Interacts with ACE inhibitors, ARBs, and potassium-sparing diuretics.
Common mistakes
- Relying on supplements instead of food.
- Taking with potassium-sparing meds.
- Ignoring kidney function.
Myths vs reality
A common misconception: Potassium supplements provide enough. In reality, capsules limited to 99mg; daily need is 2600-3400mg.
How it interacts with other compounds
- Potassium works well alongside sodium — balance sodium and potassium for blood pressure.
- Potassium works well alongside magnesium glycinate — work together as electrolytes.
Questions people ask
Why are supplements limited to 99mg? Safety regulation to prevent dangerous hyperkalemia.
Best food sources? Bananas, potatoes, spinach, avocados, beans.
Editorial note
This guide summarizes the published evidence on Potassium. It is educational content, not medical advice. Confirm with your clinician if you take prescription medications or manage a chronic condition.