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Mineral

Iodine

Also known as: I, Iodide, Potassium iodide, Sodium iodide

A
Evidence

Essential trace mineral for thyroid hormone production. Critical for metabolism, brain development, and energy.

Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.

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Daily target & upper limit

150 mcg / day · UL 1100 mcg

Iodine has an established daily reference intake. See best forms, label synonyms, upper-limit warnings, and top-scoring supplements:

Iodine dosage reference →

Primary uses

  • Thyroid hormone synthesis
  • Iodine deficiency
  • Goiter prevention
  • Thyroid hormone production
  • Metabolism
  • Brain development
  • Energy

How it works

  • Component of T3 and T4 thyroid hormones
  • Required for thyroid function
  • Supports metabolic rate

Dosage

Typical range
150-300mcg daily
Timing
Any time
With food
Optional
Duration
Long-term at RDA
Special populations
Pregnancy requires more

Forms

  • Potassium iodide
  • Kelp
  • Nascent iodine

Safety

Common side effects

  • Usually well tolerated

Contraindications

  • Thyroid disorders without guidance

Products containing Iodine

Top-scoring supplements in our catalog that list Iodine on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.

Thorne
Thyroid Health Complex (formerly Thyrocsin)
90
Thorne
Advanced Nutrients
88
Thorne
Basic Nutrients 2/Day
88
Thorne
Basic Prenatal
88
See all products →

Known interactions

Evidence notes

Essential for thyroid function

Grade A: Multiple well-designed human trials support the main claims.

Related in Mineral

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.