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| Form | Bioavailability | Best For | Elemental Content |
|---|---|---|---|
| Potassium Iodide (KI) | High | General supplementation — most studied and widely available form | 76% iodine by weight |
| Kelp/Seaweed-derived Iodine | High | Whole-food source — variable iodine content, harder to dose precisely | |
| Nascent Iodine | Moderate-High | Atomic form in liquid — marketed as more bioavailable but lacking comparative studies |
Bioavailability: High. Best for: General supplementation — most studied and widely available form. Elemental content: 76% iodine by weight.
Bioavailability: High. Best for: Whole-food source — variable iodine content, harder to dose precisely.
Bioavailability: Moderate-High. Best for: Atomic form in liquid — marketed as more bioavailable but lacking comparative studies.