Iodine (Potassium Iodide) vs Potassium Citrate
Two forms of the same compound. What differs is how much of it your body absorbs, how well you tolerate it and what it costs per month.
Side by side
Green marks the better value| Iodine (Potassium Iodide) | Potassium Citrate | |
|---|---|---|
| Bioavailability | 95% | 95% |
| Safety rating | 6/10 | 6/10 |
| Cost per month | $8 | $40 |
| Daily dose | 150-300 mcg | 15-60 mEq |
| Best timing | With food | With meals |
| Evidence level | A | A |
Verdict
Iodine (Potassium Iodide) wins on 1 of the measurable metrics.
It absorbs at 95% against 95%, which is the number that decides how much of the dose actually reaches you.
What actually differs
Iodine (Potassium Iodide)
Essential mineral form providing stable iodine for optimal thyroid function and metabolism
- Stable form
- Well-absorbed
- Inexpensive
- Established safety
- Thyroid dysfunction risk
- Autoimmune concerns
- Allergic potential
- Narrow therapeutic window
Potassium Citrate
Alkalizing potassium salt that prevents kidney stone formation, supports kidney health, and maintains optimal urinary pH balance
- FDA approved
- Proven stone prevention
- pH optimization
- Cardiovascular benefits
- Hyperkalemia risk
- GI upset
- Drug interactions
- Requires monitoring
How these numbers are read
- Bioavailability is the share of the dose that reaches your bloodstream — the single most useful number when choosing a form.
- Safety rating reflects tolerance at normal doses, not toxicity risk.
- Cost is per month at the typical daily dose, so a cheaper form taken at double the dose is not cheaper.
- Evidence level A means the form itself was studied, not just the parent compound.
Where to buy
Both forms deliver the same compound — pick by the numbers above, then check the label matches.
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Common questions
Which is better, Iodine (Potassium Iodide) or Potassium Citrate?
Iodine (Potassium Iodide) absorbs better — 95% against 95%. Absorption decides how much of the dose actually reaches you, so it usually matters more than the milligrams printed on the label.
What is the difference between Iodine (Potassium Iodide) and Potassium Citrate?
Both deliver the same active compound. They differ in how well the body takes them up, how they are tolerated and what a month costs: $8 against $40.
Can you take Iodine (Potassium Iodide) and Potassium Citrate together?
You can, but there is rarely a reason to. Two forms of the same compound stack the same active dose, so the usual approach is to pick the better absorbed one and dose it properly.