Forms of Iodine: Lugol’s, Iodoral, Nascent & Kelp

Not all iodine is the same. Because the thyroid prefers iodide (I⁻) while breast and prostate prefer elemental iodine (I₂), the forms that supply both are often favored.

  • Lugol’s solution: elemental iodine dissolved in potassium iodide. 5% (“strong”) delivers ~6.25 mg per drop; 2% (“weak”) ~2.5 mg per drop. Supplies both forms and allows precise liquid dosing; downsides are staining, taste, and the need to dilute.
  • Iodoral / tablets: a tablet equivalent of Lugol’s (e.g., a 12.5 mg tablet = 5 mg iodine + 7.5 mg iodide). Convenient, no taste or staining, widely used in clinical protocols.
  • Potassium iodide (KI): iodide only. Good thyroid support and the standard for radiation emergencies, but less ideal for breast/prostate, which prefer elemental iodine.
  • Nascent iodine: a low-dose atomic form (200–600 mcg per drop) marketed as gentler and better absorbed; less clinical research and more costly per mg.
  • Kelp & seaweed: a whole-food source with trace minerals, but iodine content varies enormously by species and origin, and some seaweed carries arsenic — better for maintenance than for correcting real deficiency.

A note on “iodine skin painting”: watching a patch of applied iodine fade is not a valid test of your iodine status, and skin application is not a reliable primary supplement method.

Sources

Compiled by Dr. Jason Dean from open scientific literature and the reference above. Educational only — not medical advice, and not evaluated by the FDA. Consult a qualified healthcare provider before changing your supplement, diet, or health routine.