Potassium
Potassium supports fluid balance, nerves, muscles and blood pressure regulation. Food-first intake is preferred; supplements should be matched to diet, health context, and safety considerations.
Overview
Biological role
Potassium supports fluid balance, nerves, muscles and blood pressure regulation.
Mechanism of action
Potassium contributes to normal physiology through nutrient-specific enzyme, structural, signaling, transport, or regulatory roles described in authoritative nutrition references.
Chemical forms
Potassium may appear in foods and supplements in different chemical forms. Selection should consider the nutrient form, dose, tolerance, and health context.
Quick answers before choosing a supplement
Chemical forms and absorption
Common forms
Potassium may appear in foods and supplements in different chemical forms. Selection should consider the nutrient form, dose, tolerance, and health context.
Absorption context
Absorption can vary with food composition, supplement form, dose, and timing. Food-first intake is preferred when possible.
Clinical use
Established essential nutrient roles should be separated from supplement benefit claims. Supplement use is most appropriate when there is inadequate intake, increased need, deficiency risk, or a clinical indication.
Absorption and action pathway
What to take with, and what to avoid
Works Well With
Avoid / Use Caution
Best time to take
Frequently asked questions
When is the best time to take Potassium?
Use with meals if the supplement irritates the stomach; separate from medicines or competing minerals when needed.
Can Potassium be taken with coffee or milk?
Some minerals compete with foods, drinks, or medicines. Separate timing is useful when treating a deficiency.
Who should be careful with Potassium?
Pregnant or lactating people, older adults, children, people with chronic diseases, and people taking regular medicines should use supplements with professional guidance.
Food and Intake
| Age / group | Male | Female | Pregnancy | Lactation | Upper limit |
|---|---|---|---|---|---|
| 1-3 years | 2,000 | 2,000 | – | – | not established |
| 4-8 years | 2,300 | 2,300 | – | – | not established |
| 9-13 years | 2,500 | 2,300 | – | – | not established |
| 14-18 years | 3,000 | 2,300 | 2,600 | 2,500 | not established |
| 19+ years | 3,400 | 2,600 | 2,900 | 2,800 | not established |
International reference intake comparison
| Country / authority | Common reference value |
|---|---|
| USA / NIH-FNB | AI 3,400/2,600 mg men/women; no UL established food |
| Europe / EFSA | AI adults 3,500 mg |
| Australia-New Zealand / NRV | AI about 3,800/2,800 mg men/women |
| Thailand / Thai FDA | Thailand: use Thai RDI and Thai FDA / Ministry of Public Health regulations for labeling and supplement products. Do not interpret labeling values as therapeutic doses; product-specific limits must be checked against the latest notification and formula. |
This table compares reference-intake frameworks across authorities. Values may use different terms such as RDA, AI, PRI, or NRV and should not be merged into one universal dose.
Food source comparison for Potassium
| Food | Serving amount | Potassium | %DV | %DV bar | Servings to reach 3,400 mg |
|---|---|---|---|---|---|
| dried apricots | 1/2 cup | 755 mg | 22% | 5 | |
| cooked lentils | 1 cup | 731 mg | 22% | 5 | |
| cooked squash | 1 cup | 644 mg | 19% | 5 | |
| baked potato | 1 medium potato | 610 mg | 18% | 6 | |
| kidney beans | 1 cup | 607 mg | 18% | 6 | |
| banana | 1 medium fruit | 422 mg | 12% | 8 |
Food values are practical comparison values. Actual content varies by variety, preparation, fortification, and serving size.
Safety
Deficiency
Inadequate Potassium intake or absorption may affect body systems related to fluid balance, nerves, muscles and blood pressure regulation. Deficiency risk depends on diet, absorption, medical conditions, and life stage.
Excess and toxicity
People with kidney disease or certain medicines may need potassium guidance.
Precautions
People with kidney disease or certain medicines may need potassium guidance.
Special populations
Pregnant or lactating people, older adults, children, people with chronic diseases, and people taking regular medicines should use supplements with professional guidance.
Fast risk map
LOW: insufficient intake
Inadequate Potassium intake or absorption may affect body systems related to fluid balance, nerves, muscles and blood pressure regulation. Deficiency risk depends on diet, absorption, medical conditions, and life stage.
UL: excess intake
People with kidney disease or certain medicines may need potassium guidance.
Precautions: interactions and timing
People with kidney disease or certain medicines may need potassium guidance.
SP: special populations
Pregnant or lactating people, older adults, children, people with chronic diseases, and people taking regular medicines should use supplements with professional guidance.
Interactions and Clinical Context
Drug interactions
Potential interactions depend on the nutrient, supplement dose, medicines used, and medical conditions. People using regular medicines should check interaction guidance from clinical sources or ask a clinician.
Food interactions
Absorption can vary with food composition, supplement form, dose, and timing. Food-first intake is preferred when possible.
Clinical notes
Established essential nutrient roles should be separated from supplement benefit claims. Supplement use is most appropriate when there is inadequate intake, increased need, deficiency risk, or a clinical indication.
Evidence level
High for essential nutrient role; nutrient-specific supplementation benefits depend on baseline status and clinical context.