Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Iodine (from Kelp or Potassium Iodide) | Potassium (Citrate) | |
|---|---|---|
| Category | Minerals | Minerals |
| Standard Dose | 150-300 mcg daily (RDA: 150 mcg; upper range for optimization) | 99-200mg per capsule (regulatory limit in US); dietary target 3500-4700mg/day total |
| Timing | Morning with food. | With meals, divided throughout the day. Slow-release forms preferred for higher doses. |
| Cycle Duration | ongoing | ongoing |
| Evidence Level | strong_human | strong_human |
Iodine is the essential substrate for thyroid hormone synthesis. Thyroid peroxidase (TPO) uses iodine to iodinate tyrosine residues on thyroglobulin, producing monoiodotyrosine (MIT) and diiodotyrosine (DIT), which couple to form T4 (3,5,3',5'-tetraiodothyronine) and T3 (3,5,3'-triiodothyronine). Iodine is concentrated by the sodium-iodide symporter (NIS) in the thyroid, breast tissue, gastric mucosa, salivary glands, and choroid plexus. Beyond thyroid function, iodine has direct antimicrobial properties, modulates immune function, and may play a role in breast tissue health via iodolactone-mediated apoptosis.
150-300 mcg daily (RDA: 150 mcg; upper range for optimization)
Morning with food.
ongoing
Potassium is the principal intracellular cation, maintaining resting membrane potential (-70 to -90mV) via the Na+/K+-ATPase pump (3 Na+ out, 2 K+ in per ATP). It is essential for: cardiac rhythmicity (phase 3 repolarization of cardiac action potential), skeletal muscle contraction, nerve impulse transmission, acid-base balance (exchanged for H+ in renal tubules), blood pressure regulation (promotes natriuresis via renal sodium excretion), and insulin secretion. Citrate form provides alkalinizing anion that inhibits calcium oxalate and uric acid kidney stone formation.
99-200mg per capsule (regulatory limit in US); dietary target 3500-4700mg/day total
With meals, divided throughout the day. Slow-release forms preferred for higher doses.
ongoing
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