Mineral
Potassium (as potassium iodide)
Also known as: potassium, K, KI (when combined with iodine)
An essential electrolyte critical for nerve and muscle function, heart rhythm, and blood pressure regulation. Potassium iodide is a dual-purpose compound that delivers both potassium and iodine in one ingredient.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every Potassium (as potassium iodide) product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | NutraBio Whey Protein Isolate Powder | 96 A | $2.50 |
| 2 | BulkSupplements Glucosamine Sulfate Capsules | 95 A | $0.05 |
| 3 | Transparent Labs BULK Pre-Workout | 90 A | $1.67 |
| 4 | Thorne Heart Health Complex | 89 A | $1.43 |
| 5 | Onnit Grass Fed Whey Isolate Protein - Vanilla (30 Serving Tub) | 89 A | $2.00 |
| 6 | Thorne Joint Support Nutrients | 87 A | $1.00 |
| 7 | Thorne MediClear-SGS™ - Vanilla | 86 A- | $2.10 |
| 8 | Pure Encapsulations Potassium Magnesium (aspartate) | 86 A- | $0.20 |
| 9 | Nutricost Potassium + Magnesium Citrate Capsules | 86 A- | $0.13 |
| 10 | Thorne Catalyte® | 85 A- | $1.13 |
| 11 | Jarrow Formulas Ultra BoneUp | 85 A- | $0.41 |
| 12 | Jarrow Formulas BoneUp | 85 A- | $0.57 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much Potassium (as potassium iodide) should I take?
The typical range is In multivitamins, typically minimal amounts (under 10 mg); adequate intake for adults 51+ is 1,000-1,200 mg daily from food sources primarily. Multivitamin amounts are typically very low and safe; high-dose supplementation requires medical supervision
When should I take Potassium (as potassium iodide)?
With meals to avoid GI upset. Should be taken with food to prevent stomach irritation.
Which form of Potassium (as potassium iodide) is best?
Potassium iodide. Other forms in the catalog: Potassium citrate, Potassium gluconate, Potassium chloride.
Is Potassium (as potassium iodide) safe?
Commonly reported: GI upset when taken on empty stomach.
Which Potassium (as potassium iodide) supplement scores highest?
NutraBio Whey Protein Isolate Powder, at 96/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Daily target & upper limit
4700 mg / dayPotassium (as potassium iodide) has an established daily reference intake. See best forms, label synonyms, upper-limit warnings, and top-scoring supplements:
Potassium (as potassium iodide) dosage reference →Primary uses
- Electrolyte balance
- Nerve and muscle function
- Heart rhythm regulation
- Blood pressure support
How it works
- Maintains intracellular fluid osmolarity
- Essential for sodium-potassium ATPase pump function
- Supports cardiac action potentials
- Required for proper muscle contraction
Dosage
- Typical range
- In multivitamins, typically minimal amounts (under 10 mg); adequate intake for adults 51+ is 1,000-1,200 mg daily from food sources primarily
- Timing
- With meals to avoid GI upset
- With food
- Should be taken with food to prevent stomach irritation
- Duration
- Multivitamin amounts are typically very low and safe; high-dose supplementation requires medical supervision
- Special populations
- Individuals with kidney disease, heart disease, or taking ACE inhibitors/ARBs should consult healthcare provider; those on certain blood pressure medications need monitoring
Forms
- Potassium iodide· 70/100
- Potassium citrate· 70/100
- Potassium gluconate· 70/100
- Potassium chloride· 70/100
Safety
Common side effects
- GI upset when taken on empty stomach
Contraindications
- Kidney disease or renal impairment
- Use with ACE inhibitors, ARBs, NSAIDs without medical supervision
- Certain cardiac conditions
Products containing Potassium (as potassium iodide)
Top-scoring supplements in our catalog that list Potassium (as potassium iodide) on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
Extensive evidence for essential role in electrolyte balance and cardiovascular health; well-characterized mechanisms; strong evidence for cardiovascular benefits from adequate intake.
Grade A: Multiple well-designed human trials support the main claims.
Related in Mineral
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.