Iodine is an essential trace element that belongs to the halogen group on the periodic table. It occurs naturally in various foods, particularly in seafood, seaweed, and dairy products. Iodine is crucial for the synthesis of thyroid hormones, which play a vital role in regulating metabolism, growth, and development. The most studied health effects of iodine involve its impact on thyroid function and its ability to prevent goiter, a condition characterized by the enlargement of the thyroid gland.

How many studies on Iodine are available?

NutriVouch references 471 human studies on Iodine, all peer-reviewed and indexed on PubMed.

Is Iodine effective for Thyroid Support?

For Thyroid Support, Iodine has an effectiveness score of 9/10 — gold-standard treatment with strong clinical evidence. Based on 10 relevant studies.

Is Iodine effective for Prenatal Health?

For Prenatal Health, Iodine has an effectiveness score of 8/10 — strong evidence supporting clinical use. Based on 16 relevant studies.

Is Iodine effective for Hormone Balance?

For Hormone Balance, Iodine has an effectiveness score of 6/10 — moderate evidence — works in some populations. Based on 18 relevant studies.

Is Iodine effective for Cognitive Function?

For Cognitive Function, Iodine has an effectiveness score of 5/10 — moderate evidence — works in some populations. Based on 14 relevant studies.

Is Iodine effective for Fertility Support?

For Fertility Support, Iodine has an effectiveness score of 4/10 — weak or limited clinical evidence. Based on 21 relevant studies.

Confidence level

Strong evidence

471 studies

Iodine

Absorption

✦Can be taken with or without food. No significant absorption interactions known.

Daily Dose

⚖

Common dose: 150–300 mcg daily

RDA: 150 mcg

Upper limit: 1,100 mcg

Best form: Potassium iodide, Sodium iodide

Timing: Can be taken with or without food.

Iodine needs may increase during pregnancy and lactation. Excessive intake can lead to thyroid dysfunction, so consult a healthcare provider before using high doses.

Effects

Food Sources

Seaweed (dried)232mcg per gram
Cod99mcg per 85g
Yogurt75mcg per cup
Milk56mcg per cup
Iodized salt71mcg per 1/4 teaspoon