Deficiency/Hormonal/Women

Iodine

Essential trace mineral for thyroid hormone production and deficiency prevention, most useful for low-iodine diets and pregnancy.

Iodine

Essential trace mineral for thyroid hormone production and deficiency prevention, most useful for low-iodine diets and pregnancy.

score

evidence

Caution

risk

Proven Benefits

01Corrects iodine deficiency

02Reduces goiter from low iodine

03Normalizes TSH/T4 in insufficiency

04Raises breast-milk iodine

05Supports fetal neurodevelopment

06May reduce cyclic breast pain

Chemical Forms

Recommended

Potassium iodide
Potassium iodate

Avoid

Kelp/seaweed blends (iodine content varies widely)
High-strength Lugol's solution (easy to overshoot into megadose territory)

Expert Note

Potassium iodide and potassium iodate provide precise, stable microgram dosing; iodate is especially stable in salt fortification, while iodide is common in supplements and prenatals. Seaweed-derived products can vary greatly by batch and may also carry heavy metals. Very concentrated liquid iodine makes accidental excess intake much more likely.

Protocol

Amount

150 mcg

Frequency

Once daily

When

Any time of day — consistency matters more than timing; take with food if it causes nausea.

Condition-Based Dosing

Adults with low seafood/dairy intake and no iodized salt

150 mcg daily— Covers the standard adult requirement for most people using a supplement.

Trying to conceive or pregnant

150 mcg supplemental iodine daily, usually within a prenatal— Most guidelines aim for total intake around 220 mcg/day in pregnancy; avoid megadoses.

Lactating

150 mcg supplemental iodine daily— Breast-milk iodine demand is higher; total daily need is about 290 mcg/day.

Known thyroid disease or thyroid medication use

Only supplement with clinician guidance— Even modest changes in iodine intake can alter thyroid control in susceptible people.

Safety & Limits

Upper Safe Limit

1100 mcg/day (IOM UL for adults)

Cycling

Safe for continuous use

Contraindications

Hashimoto's thyroiditis or positive thyroid antibodies — excess iodine can worsen autoimmune thyroid dysfunction

Graves' disease, toxic nodules, or hyperthyroidism — iodine may trigger or worsen overactivity

Current levothyroxine or antithyroid medication — changes in iodine intake can alter thyroid control

Amiodarone use — major iodine load and strong thyroid interaction

Recent iodinated contrast imaging or planned radioactive iodine therapy — extra iodine may interfere with medical management

Dermatitis herpetiformis — iodide can flare skin lesions

Synergies

Selenium

Selenium-dependent deiodinases and antioxidant enzymes help activate thyroid hormones and buffer oxidative stress during iodine repletion.

Iron

Iron is needed for thyroid peroxidase activity, so iron deficiency can blunt the thyroid response to iodine, especially in menstruating women.

Avoid Combining With

✕Smoking (thiocyanate competes with thyroid iodine uptake)
✕Perchlorate exposure from contaminated water or work settings (blocks iodine transport into the thyroid)
✕High nitrate exposure in drinking water (can compete with thyroid iodine uptake)
✕Large raw cassava or millet intake in low-iodine diets (goitrogens reduce thyroid iodine use)

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