Typical dose
Dosage is expressed as micrograms (mcg) of iodin...
Oral
Oral safety: low
About this supplement
Sodium iodide is an inorganic ionic compound consisting of sodium cations (Na⁺) and iodide anions (I⁻). It is a white, crystalline, water-soluble salt primarily used as a source of the essential trace mineral iodine. In dietary supplements, it provides bioavailable iodine, which is crucial for thyroid hormone synthesis (thyroxine/T4 and triiodothyronine/T3). These hormones regulate metabolism, growth, development, protein synthesis, and many other physiological processes. Sodium iodide is also used in medical settings (e.g., as a component in some expectorants, and historically in thyroid protection against radioactive iodine). Its high solubility makes it suitable for liquid formulations.
How much to take
- Typical amount
- Dosage is expressed as micrograms (mcg) of iodine. For general supplementation, typical doses range from 150-290 mcg daily for adults. Higher doses (e.g., 130 mg) are used only for thyroid blocking in radiation emergencies under medical direction.
- Suggested range
- 150-290 mcg iodine daily (from all sources) for adults; varies by age, gender, and life stage (e.g., pregnancy: 220-290 mcg).
Potential benefits
Benefits linked to this supplement form:
Things to watch for
Possible side effects linked to this form:
Health goals
Needs and goals this form may help with:
Other forms of Iodine
Compare absorption and active amounts with sibling forms:
Kelp (Seaweed)
Rich natural source of iodine and minerals. Supports thyroid health.
Molecular Iodine (I2)
Powerful antiseptic; essential mineral for thyroid function.
Nascent Iodine
A supplemental form of iodine claimed to be in a highly bioavailable atomic stat...
Potassium Iodide
Essential mineral for thyroid function. Also used for thyroid protection in radi...
Technical details ▼
Chemical ID (CAS)
7681-82-5
Formula
NaI
Physical properties
White, crystalline, odorless solid. Highly soluble in water, also soluble in ethanol and acetone. Hygroscopic (absorbs moisture from air). Melting point: 661°C. Density: 3.67 g/cm³.
How it’s made
Typically produced synthetically by reacting sodium hydroxide or sodium carbonate with hydroiodic acid, followed by crystallization and purification. NaI + H2O → NaOH + HI; NaOH + HI → NaI + H2O. Can also be produced by the reaction of iron iodide with sodium carbonate.