Best Iodine for Pregnancy
Top 4 products ranked
Last reviewed May 2026
Clinical dose: 150–500 mcg
Why Iodine for Pregnancy
Iodine plays a important role in pregnancy. Critical building block for thyroid hormones T3 and T4, which regulate metabolism, growth, and development. Kelp-based supplements can provide highly variable iodine content—standardized potassium iodide is more reliable for consistent dosing.
What dose to look for
Clinical studies typically use 150–500 mcg of iodine. Common kelp and iodine supplement range. Products below this range may not deliver meaningful results.
What the research says
Iodine has strong clinical evidence for pregnancy benefits. Essential for thyroid hormone synthesis; WHO estimates 2 billion people worldwide have insufficient intake Learn more
Super Nutrition
Simply One, Prenatal Multivitamin with Super Greens, Spices, Vitamin A, and Folate, 90 Tablets
kelp · 290 mcg
Thorne
Basic Prenatal, 90 Capsules
potassium iodide · 150 mcg
Nature Made
Prenatal Folic Acid + DHA
potassium iodide · 150 mcg
Solgar
Prenatal Nutrients
potassium iodide · 150 mcg